A numerical computing surroundings and programming language, MATLAB, was developed by MathWorks. It permits the plotting of capabilities, matrix manipulations, implementation of algorithms, interfacing with packages written in different languages, together with C, C++, and Fortran, and creation of person interfaces. For all budding information science and machine studying professionals, studying MATLAB will enable you to to deal with areas corresponding to structure modeling, evaluation surroundings, and Model-Based Design. We have compiled a listing of essentially the most continuously requested MATLAB Interview Questions together with their solutions that will help you put together higher and ace your upcoming interviews.
Here are the generally requested MATLAB interview questions:
- What is MATLAB?
- How to put in MATLAB?
- How to plot a graph in MATLAB?
- How to name a operate in MATLAB?
- What is MATLAB used for?
- How to run MATLAB code?
- How to learn photographs in MATLAB from a folder?
- How to put in writing operate in MATLAB?
- How to make use of for loop in MATLAB?
- How to unravel differential equations in MATLAB?
Let’s get began!
History of MATLAB
MATLAB Interview Questions
This part on MATLAB Interview Questions covers generally requested questions in the course of the interview course of. Whether you’re new to the interview course of or are an skilled skilled, studying these questions will enable you to enhance your confidence and ace your upcoming interview.
What is MATLAB?
Ans. MATLAB is an acronym for MATrix LABoratory. It is an open-source software program/API which was initially developed for mathematical calculations, together with matrix operations. The newest software program model can carry out numerous complicated calculations corresponding to information evaluation and visualization, scientific and engineering graphics, and so forth. Its prime options additionally embody simulation and modeling.
How to put in MATLAB?
Ans. For putting in the newest model of MATLAB, i.e., MATLAB R2020b:
Prerequisites (for Windows):
- A PC or desktop pc with Windows 10 or at-least Windows 7.
- Any Intel or AMD x86-64 processor (for the sake of your laptop).
- A minimal of 4 GB RAM however 8 GB is advisable.
- SSD is advisable, however 3.5 GB HDD house for MATLAB solely, 5-8 GB for a typical set up.
- A graphic card just isn’t required.
Prerequisites (for Mac):
- macOS Big Sur (11) or macOS Catalina (10.15) or macOS Mojave (10.14).
- Any intel processor x86-64 processor.
- A minimal of three.4 HDD house is required, however for a full set up house of 29 GB is required.
- A minimal of 4 GB RAM however 8 GB is advisable.
- A graphic card just isn’t required.
Prerequisites (for Linux):
- Ubuntu variations after the one in all 16.04 LTS, Debian 9 and newer variations, Red Hat Enterprise Linux 7 and newer, SUSE Linux Enterprise Desktop 12 and newer, and SUSE Linux Enterprise Server 12 and newer.
- Any Intel or AMD x86-64 processor.
- 3.3 GB of HDD house for MATLAB solely, 5-8 GB for a typical set up. But an SSD is advisable.
- A full set up of all MathWorks merchandise could take as much as 28 GB of disk house.
- A minimal of 4 GB RAM however 8 GB is advisable.
- A graphic card just isn’t required.
Installation is similar for all working techniques. You can obtain the software program from any protected web site corresponding to its supply mathworks.com or sourceforge.web. Simply open the browser, navigate to the URL above, and obtain the software program.
But pay attention to the truth that MATLAB is such an enormous software program with its newest replace of greater than 20 GB. It is not going to be put in in a single day or in a single try. So, it is strongly recommended to make use of any web obtain supervisor to put in it on a multi-day try.
How to plot a graph in MATLAB?
Ans. For any two factors, x and y, with some values given, a operate referred to as plot (x, y) are used to plot a graph in MATLAB.
x : [value of array];
y : [value of array];
plot(x, y)How to name a operate in MATLAB?
Ans. A operate in MATLAB will be referred to as utilizing the identify you give to the operate, however first, it must be written within the New Script tab below the File Tab. You can merely name the operate by writing the operate’s identify within the code space.
>> function_name (within the work space)What is MATLAB used for?
Ans. MATLAB language is a high-level matrix language. It has management constructions, capabilities, information constructions, enter/ output, and OOP options. MATLAB API permits to the writer of C and FORTRAN packages to work together with MATLAB. It is used for numerous industry-level designing processes and for working the management techniques and automation of various kinds of machines by defining a selected set of codes for an object.
How to run MATLAB code?
Ans. NOTE: Before working any code, be sure you save the respective code in order that your progress doesn’t fly away. Any code can run in MATLAB as soon as it’s saved by utilizing the Save and Run button within the dwelling tab of MATLAB, or you’ll be able to merely use the F5 key in your keyboard.
How to learn photographs in MATLAB from a folder?
Ans. A syntax to learn a picture from any folder is given as:
D = 'listing the place the information are saved';
S = dir(fullfile(D,'identify*.jpg')); % sample to match filenames.
for ok = 1:numel(S)
F = fullfile(D,S(ok).identify);
I = imread(F);
imshow(I)
S(ok).information = I; % non-compulsory, save information.
finish
How to put in writing capabilities in MATLAB?
Ans. A operate will be written in MATLAB utilizing the New Script possibility below the File tab.
Steps to put in writing a operate:
- Click on the file tab.
- Click on the New Script possibility.
- A brand new field will seem whereby you’re going to get a syntax given as
operate [y1, ...,yN] = function_name(x1, ...,xM)
finish
operate [y1, ...,yN] = myfun(x1, ...,xM) declares a operate named function_name that accepts inputs x1, ...,xM and returns outputs y1, ...,yN.
Here you’ll be able to write a operate and reserve it within the folder.
How to make use of for loop in MATLAB?
Ans. A for loop is used to repeat a sure set of directions a hard and fast variety of instances.
The syntax of for loop is:
for index = values
statements
finish
for index = values, statements, finish executes a bunch of statements in a loop for a specified variety of instances.
How to unravel differential equations in MATLAB?
Ans. Any differential equation will be solved following a set of directions and correct syntax. But for extra accuracy, we use some solvers, casually referred to as ODE solvers normally, used for odd differential equations. Some of the generally used ODE solvers are ode23, ode45, ode15s, and ode23s.
Syntax to unravel differential equations in MATLAB:
- Create a operate in an m-file to outline the right-hand facet of the equation to be solved.
- Determine the interval size for the impartial variable tspan.
- Enter the preliminary circumstances as n0.
- Call the solver to acquire the answer by typing the next command:
[t, y] = ode23(@function_name, tspan, n0)- The left-hand facet of the command is the output argument containing two vectors. Other solvers, too, use the same syntax.
After saving this script, we will name the operate by its identify or because the saved script identify with given some preliminary circumstances to get the solutions.
How to learn CSV information in MATLAB?
Ans. CSV stands for Comma-Separated Values. A command referred to as csvread is usually used to learn the CSV information however just isn’t really most well-liked.
Syntax:
The newer model of MATLAB as a substitute recommends readmatrix to learn such sorts of information.
Syntax:
What is MATLAB software program?
Ans. MATLAB is a high-performance language for technical computing. Computation, visualization, and programming are built-in with MATLAB in an easy-to-use surroundings. It helps the person within the growth of algorithms, complicated calculations, simulation, modeling, and prototyping of knowledge.
Ans. Comments in MATLAB will be inserted in between the codes. The syntax for remark goes like this:
“ % your comment goes here. ”
How to open SIMULINK in MATLAB?
Ans. SIMULINK will be simply accessed in MATLAB by way of the Home tab. Simply go to the Home tab and click on Simulink.
How to implement a neural community in MATLAB?
Ans. A neural community is an adaptive system that learns by utilizing interconnected nodes or neurons in a layered construction that resembles a human mind. A neural community can be taught from information, so it may be skilled to acknowledge patterns, classify information, and forecast future occasions.
It breaks down the enter into layers of abstraction. It will be skilled utilizing many examples to acknowledge patterns in speech or photographs, simply because the human mind does. Its habits is outlined by how its particular person parts are linked and by the power or weights of these connections. MATLAB helps you to develop neural networks with just some strains of code.
The workflow for the overall neural community design course of has seven major steps:
- Collect information
- Create the community
- Configure the community
- Initialize the weights and biases
- Train the community
- Validate the community (post-training evaluation)
- Use the community
MATLAB and Deep Learning Toolbox present command-line capabilities and apps for creating, coaching, and simulating shallow neural networks. The apps make it straightforward to develop neural networks for duties corresponding to classification, regression (together with time-series regression), and clustering. After creating your networks in these instruments, you’ll be able to mechanically generate MATLAB code to seize your work and automate duties.
How to put in writing for loop in MATLAB?
Ans. Here is offered an instance of ‘for loop’ in MATLAB:
A = [3 6 9 4 1];
for i = 1:size(A)
disp(A(i))
finishAs mentioned earlier, a for loop is used is commonly used to assign to or entry array parts iteratively.
How to create a matrix in MATLAB?
Ans. To create an array with n variety of parts in m variety of rows, separate the weather with both an area or a comma. For instance, to create a matrix A of order 3 X 3, we write it as:
A = [ 21 92 43, 45 67 54, 72 88 91 ] The outcome to which shall be represented as:
A = 3 X 3
21 92 43
45 67 54
72 88 91
How to create GUI in MATLAB?
Ans. Steps to create a GUI:
- Start GUIDE by typing information on the MATLAB immediate.
- In the GUIDE Quick Start dialog field, choose the Blank GUI (Default) template after which click on OK.
- Display the names of the elements within the part palette:
- Select File > Preferences > GUIDE.
- Select Show names within the part palette.
- Click OK.
Following the steps, you can begin to create a GUI in MATLAB.
How to make use of SIMULINK in MATLAB?
Ans. SIMULINK in MATLAB is used to create a mannequin for some course of, for instance, a simplified movement of a automobile or any management system course of. When you employ MATLAB ® and Simulink ® collectively, you mix textual and graphical programming to design your system in a simulation surroundings. SIMULINK will be accessed in MATLAB from the Home tab itself. SIMULINK is mainly a graphical block diagramming software with a customizable set of block libraries. When opened, Simulink opens with the Library Browser. The Library Browser is used for constructing simulation fashions.
On the left facet window pane, you can see a number of libraries categorized on the idea of assorted techniques; clicking on each will show the design blocks on the appropriate window pane. To create a brand new mannequin, click on the New button on the Library Browser’s toolbar. This opens a brand new untitled mannequin window. A Simulink mannequin is a block diagram.
Model parts are added by choosing the suitable parts from the Library Browser and dragging them into the Model window. Alternatively, you’ll be able to copy and paste the mannequin parts into the mannequin window. Here you’ll be able to select any mannequin based mostly in your alternative of creating any undertaking.
How to cease a program in MATLAB?
Ans. You can merely use the stop command to cease a program in MATLAB or the desktop shortcut corresponding to Ctrl + C.
How to plot a circle in MATLAB?
Ans. You can use this given an instance, or the syntax, to plot a circle in MATLAB.
Here is a MATLAB operate that plots a circle with radius ‘r’ and locates the middle on the coordinates ‘x’ and ‘y’:
operate h = circle(x, y, r)
maintain on
th = 0 : pi/50 : 2 * pi;
xunit = r * cos(th) + x;
yunit = r * sin(th) + y;
h = plot(xunit, yunit);
maintain offAnd you’ll be able to run the code within the workspace by typing the phrase ‘circle’ and the enter circumstances.
How to interface ARDUINO in MATLAB?
Ans. Steps to interface ARDUINO with MATLAB:
- Start MATLAB and click on the Add-Ons drop-down menu. In the drop-down menu, click on Get Hardware Support Packages. It will begin the package deal installer window.
- Select Install from the Internet and click on Next.
- In the subsequent window, you will notice all of the accessible packages for MATLAB and Simulink. Select the Arduino package deal, then verify all of the packages displayed and click on Next to proceed the set up.
- Next, the installer will ask you to log in to your MathWorks account. If you don’t have an account, you’ll be able to create one throughout set up. Accept the license settlement on the subsequent display screen and proceed to obtain the packages. Now it’s important to look ahead to MATLAB to obtain and set up all of the required packages.
How to verify if the connection is profitable:
Once the packages are put in, join your Arduino board to your PC and sort the next command within the MATLAB command window,
>> a = arduino()MATLAB will then try to speak together with your board. If profitable, MATLAB will show the properties of the Arduino board linked to your PC.
How to import information from EXCEL in MATLAB?
Ans. You can do that by clicking the Import Data icon below the Home tab and navigating to the Excel file you wish to import. It’s only a easy step.
How to take away the background from a picture in MATLAB?
Ans. These are some steps to take away background photographs in MATLAB utilizing color-based segmentation utilizing Okay – means Clustering:
- Read the picture. It follows the given syntax:
he = imread('hestain.png');
imshow(he), title('H&E picture');
textual content(measurement(he,2),measurement(he,1)+15,...
'Image courtesy of Alan Partin, Johns Hopkins University', ...
'FontSize', 7, 'HorizontalAlignment', 'proper' );
Where imread is the operate to learn the picture named hestain.png.
- Convert the picture from RGB coloration house to L*a*b*color house
The L*a*b* coloration house is derived from the CIE XYZ tristimulus values. The L*a*b* house consists of a luminosity layer ‘ L* ‘, chromaticity-layer ‘ a* ‘ indicating the place the colour falls alongside the red-green axis, and chromaticity-layer ‘ b* ‘ indicating the place the colour falls alongside the blue-yellow axis. All of the colour info is within the ‘ a* ‘ and ‘ b* ‘ layers.
It follows the syntax:
- Classify the colours within the ‘a*b*’ Space Using Okay-Means Clustering.
Clustering is a option to separate teams of objects. Okay-means clustering treats every object as having a location in house. It finds partitions such that objects inside every cluster are as shut to one another as potential and as removed from objects in different clusters as potential. Okay-means clustering requires that you simply specify the variety of clusters to be partitioned and a distance metric to quantify how shut two objects are to one another.
ab = lab_he(: , : , 2:3);
ab = im2single(ab);
nColors = 3;
% repeat the clustering 3 instances to keep away from native minima
pixel_labels = imsegkmeans( ab, nColors, 'NumAttempts', 3);
For each object in your enter, imsegkmeans returns an index, or a label, equivalent to a cluster. Label each pixel within the picture with its pixel label.
How to implement SVM in MATLAB?
Ans. A assist vector machine (SVM) is a supervised studying algorithm used for a lot of classification and regression issues, together with sign processing medical functions, pure language processing, and speech and picture recognition. The foremost aim of the SVM algorithm is to separate information factors of 1 class from these of one other class to the most effective diploma potential.
Support vectors check with a subset of the coaching observations that determine the placement of the separating hyperplane. The normal SVM algorithm is formulated for binary classification issues, and multiclass issues are usually lowered to a collection of binary ones. You can use a assist vector machine (SVM) when your information has precisely two courses.
How so as to add a toolbox in MATLAB?
Ans. To create a toolbox set up file:
- In the Environment part of the Home tab, choose Package Toolbox from the Add-Ons menu.
- Click the ‘plus’ button within the Package a Toolbox dialog field and choose your toolbox folder. Creating the toolbox package deal from the folder stage above your toolbox folder is sweet apply. The .mltbx toolbox file accommodates details about the trail settings on your toolbox information and folders. By default, any of the included folders and information which are in your path while you create the toolbox seem on their paths after the top customers set up the toolbox.
- Add the details about your toolboxes within the dialog field, corresponding to ToolBox identify, model, Author identify, e mail and Company, ToolBox picture, its abstract, and outline.
- Clicking Package on the high of the Package a Toolbox dialog field to avoid wasting your toolbox. Packaging your toolbox generates a .mltbx file in your present MATLAB folder.
How so as to add the trail in MATLAB?
Ans. A MATLAB operate named addpath is used so as to add a path in MATLAB.
The syntax for addpath goes as:
addpath( 'listing' )
or
addpath( 'dir', 'dir2', 'dir3' ...)
Here addpath( ‘directory’ ) prepends the desired listing to the present MATLAB search path; that’s, it provides them to the highest of the trail. Use the total pathname for the listing.
addpath( ‘dir’, ‘dir2’, ‘dir3’ …) prepends all the desired directories to the trail. Use the total pathname for every dir.
As an alternative choice to the addpath operate, use the Set Path dialog field. To open it, choose Set Path from the File menu on the MATLAB desktop.
We use the Set Path dialog field for the next:
- Viewing the Search Path
- Adding Directories to the Search Path
- Moving Directories Within the Search Path
- Removing Directories from the Search Path
- Restoring the Default Search Path
- Reverting to the Previous Path
- Saving Settings to the Path
- Editing pathdef.m
How to declare an array in MATLAB?
Ans. An array will be declared in MATLAB utilizing the next syntax:
It creates an array of 1X5.
Or it may be declared within the following syntax:
It additionally creates an array of the identical 1X5 dimension.
How to calculate classification accuracy in MATLAB?
Ans. Here’s one strategy we could strive:
% output= evalfis( fis, enter);
pred = spherical(output);
acc_count = nnz( pred==enter);
acc = acc_count/size(enter);Here we take into account spherical values of the fuzzy system because the predictions obtained after which rely the variety of right predictions over the whole variety of inputs.
How to generate sine waves in MATLAB?
Ans. A program to generate a sine wave in MATLAB is given beneath:
t = 0:0.01:2;
w = 5;
a = 4;
st = a*sin(w*t);
plot(t, st);Using this program and altering the values of ‘t’, ‘w’, and ‘a’, we will additional generate longer sine waves.
How to learn the audio information in MATLAB?
Ans. Here is the syntax to learn audio information in MATLAB:
[y, Fs] = audioread(filename)
Here it reads information from the file named filename and returns sampled information, y, and a pattern charge for that information, Fs.
How to resize a picture in MATLAB?
Ans. Image resize in MATLAB will be completed by utilizing the next syntax:
The above-given syntax returns picture J, which is scaled instances the dimensions of I. The enter picture I will be grayscale, RGB, binary, or categorical picture.
Ans. Multiple line feedback in MATLAB will be made utilizing the syntax:
What is the MATLAB working surroundings?
Ans. MATLAB working surroundings has numerous instruments to work with MATLAB. It has amenities to handle variables. MATLAB helps the export and import of knowledge throughout functions. Certain instruments can be found to develop and handle MATLAB information. Debugging and profiling of MATLAB functions are extra versatile with MATLAB. The clean house between the capabilities and command historical past field is the place we will write the codes.
Explain how polynomials will be expressed in MATLAB.
Ans. There are quite a few methods by which a polynomial operate will be expressed in MATLAB. Polynomials are equations of a single variable with nonnegative integer exponents. MATLAB represents polynomials with numeric vectors containing the polynomial coefficients ordered by descending energy. For instance, [1 -4 4] corresponds to x2 – 4x + 4. Some of the capabilities are:
Poly, polyeig, polyfit, residue, roots, polyval and so forth.
Explain deal with graphics in MATLAB.
Ans. Handle Graphics is a subsystem of MATLAB that handles graphics. It has high-level instructions for 2D and 3D information visualization. Image processing, animation, and presentation graphics will be generated utilizing Handle Graphics. Low-level instructions enable customizing the graphics’ appearances. Handle Graphics permits to construct of personalized Graphics User Interfaces.
What are the sorts of loops that MATLAB supplies?
Ans. MATLAB supplies three sorts of loops, similar to another programming language, that are:
- For loop
- While loop
- Nested loops (if-else, elif, and so forth).
What are 3D-Visualization parts in MATLAB?
Ans. 3D-visualization parts let MATLAB cope with the 3D graphics. These are a few of the 3D-visualization parts in MATLAB:
- Surface and Mesh plots – Includes plot matrices and coloration maps.
- Lightning – Used for including and controlling scene lighting.
- Transparency – Used to specify object transparency.
- Volume visualization – Used for the quantity information grid.
What are reminiscence administration capabilities in MATLAB?
Ans. There are mainly 5 sorts of reminiscence administration capabilities in MATLAB, that are:
1. clear – Removes variables from reminiscence.
2. pack – Saves the prevailing variables to disk after which reloads them contiguously.
3. save – Selectively persists variables to disk.
4. load – Reloads an information file saved with the save operate.
5. stop – Exits MATLAB and returns all allotted reminiscence to the system.
What do you imply by M-file in MATLAB?
Ans. An M file is a textual content file utilized by MATLAB. It can retailer a script, class, or particular person operate within the MATLAB language. M information are used for executing algorithms, plotting graphs, and performing different mathematical operations. It is the essential sort of file that MATLAB has. The extension for the m file is .m . Any file with the extension .m is an m-file.
What are MEX information?
Ans. A MEX file is a operate created in MATLAB that calls a C/C++ program or a Fortran subroutine. A MEX operate behaves similar to a MATLAB script or operate.
The MEX file accommodates just one operate or subroutine. The calling syntax will depend on the enter and output arguments outlined by the MEX operate. The MEX file should be in your MATLAB path.
What are normal toolboxes current in MATLAB? How can they be accessed?
Ans. There are a wide range of toolboxes current in MATLAB, a few of that are:
- Optimization
- Neural Networks
- Partial Differential Equations
- Image processing
- Statistics
- Wavelets
- Control techniques
And many extra…
To entry these toolboxes, merely go to the MATLAB begin menu, after which select the Toolboxes sub menu, then select the Toolbox which we wish to use.
What is Xmath?
Ans. Xmath is an interactive scripting and graphics surroundings for X-window workstations. It can script languages with OOP options. It is a debugging software with GUI options.
Can we run MATLAB with out graphics?
Ans. The reply is YES. We can run MATLAB with out graphics too since it’s a GUI. Also, at instances, we will run the script codes with out displaying the graphs.
What is a P-code?
Ans. P-code is a option to safe-key your supply code such that others shouldn’t have any entry to the supply code of any of your tasks. The authentic extension for a MATLAB file is .m, however for a p-code utilized file is .p . A P-code file behaves the identical because the MATLAB supply. When MATLAB P-codes a file, the file is obfuscated and never encrypted.
What is Stress Analysis in MATLAB?
Ans. Stress Analysis or Finite Element Analysis is a computational methodology for predicting how any object will react to real-world forces, warmth, vibrations, and so forth. We are effectively conscious of the truth that MATLAB is a multidimensional software program that finds its utility in numerous disciples of engineering; for instance, mechanical engineering makes use of stress evaluation to design automotive et al.
MATLAB Interview Questions FAQs
Q: What are the fundamentals of MATLAB?
A: MATLAB is a software used for technical computing, calculation, and visualization in a unified surroundings. The full type of MATLAB is MATrix LABoratory, so it’s good for matrix manipulation and problem-solving which are associated to Linear Algebra, Modelling, Simulation and Control functions, and lots of extra.
Q: What is the total kind for MATLAB?
A: The full type of MATLAB is MATrix LABoratory.
Q: Is MATLAB laborious to be taught?
A: Most individuals don’t discover MATLAB laborious to be taught. The syntax is lenient; the event surroundings helps discover errors, and so forth. In truth, in simply 10-15 days, you’ll be able to develop into a professional in MATLAB programming.
Q: What is the drawback of MATLAB?
A: One of the disadvantages of MATLAB is that it’s an interpreted language, so it might carry out slower as in comparison with a compiled language.
Q: Is MATLAB higher than Python?
A: MATLAB is the quickest platform when the utilization of sure MATLAB capabilities is averted by code. Although slower, Python is commonly in comparison with MATLAB, particularly for utilizing over 12 processing cores whereas jobs are working in parallel.
Q: What to put in writing instructions in MATLAB?
A: To write instructions in MATLAB, you will need to go to the menu and faucet Commands. You then need to faucet on the MATLAB cursor (>>) with a purpose to open the keyboard. Now sort MATLAB instructions as you normally would. For instance, MATLAB Mobile™ sends every command to the Cloud for evaluation.
Q: Who makes use of MATLAB?
A: MATLAB is utilized by a number of engineers in addition to scientists the world over for numerous functions. They use it in academia and {industry}, which embody picture and video processing, deep studying and machine studying, sign processing and communications, management techniques, computational finance, take a look at and measurement, and computational biology.
Q: What is MATLAB written in?
A: MATLAB has its personal coding language, which is easy to make use of as in comparison with the opposite coding languages. Apart from this, you can too select a language by which you want to code. It comes with in-built compilers for hottest coding languages corresponding to C, C++, and Java. You can change the language as per your preferences.
Q: Is MATLAB tougher than Python?
A: MATLAB is the best and most extremely productive computing surroundings for engineers in addition to scientists. It makes use of the MATLAB language. This is the one high programming language that’s devoted to mathematical and technical computing. On the opposite hand, Python known as a general-purpose programming language.
Q: Is MATLAB price studying in 2021?
A: MATLAB is necessary for individuals who wish to construct a profession in arithmetic (summary or utilized), science, engineering, computational biology, physics, or data-oriented finance. The reply is sure, it’s price studying.
Hope these questions have helped you to grasp the core ideas of MATLAB higher and put together for the interview. For extra studying content material on Data Science and Machine Learning, go to Great Learning Academy, the place you can see numerous programs for professionals without spending a dime.
Also, Read the Top 25 Common Interview Questions