Introduction MATLAB Interview Questions And Answers
MATLAB is a highlevel programming language which was developed by MathWorks in 1970. It is a very powerful programming language, which is capable to do lots of things. It can be used to do matrix manipulations, plotting of functions and data, to develop algorithms, to do numerical calculations, creating a user interface, can easily interact with other programs written in other programming languages like C, C++, Java, PHP, ASP, Python. Can also use in Data models, in embedded systems etc.
It has many inbuilt command and math’s functions to solve complex numerical calculations, it is mostly used in math calculations in following things Integration, Transforms, Curve Fitting, Data Analysis, statistics, 3D, 2D plotting, Linear algebra, Nonlinear algebra, graphics, nonlinear function calculations of differential equations.
Features of MATLAB:
 It is highlevel level and 4th generation language used for application development, Numerical calculations.
 It provides an interactive environment for iterative searching, design and problemsolving.
 It provides inbuilt function, commands for numerical calculations, integration, statistics, linear algebra, filtering, optimization, Fourier analysis and solving ordinary differential equations.
 it provides functions for integration of programs to other programs written in different languages like C++, JAVA, c, Python, PHP, ASP.Net.
 It has tools to build an application with the custom graphical user interface.
Uses of MATLAB :
MATLAB is used in fields of science, engineering including all streams, physics, chemistry, Main areas are following below given.
 Computational Finance
 Control Systems
 Test and Biology
 Computational Biology
 Image Processing
 Video Processing
 Signal Processing
 Communications
Now, if you are looking for a job which is related to MATLAB then you need to prepare for the MATLAB Interview Questions. It is true that every interview is different as per the different job profiles but still to clear the interview you need to have a good and clear knowledge of MATLAB. Here, we have prepared the important MATLAB Interview Questions and Answers which will help you get success in your interview.
Below are the 10 important MATLAB Interview Questions and Answers that are frequently asked in an interview. these questions are divided into parts are as follows:
Part 1 – MATLAB Interview Questions (Basic)
This first part covers basic MATLAB Interview Questions and Answers
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Q1 – What is MATLAB and what are its uses?
Answer:
MATLAB is a highlevel programming language which was developed by MathWorks in 1970 It has an Interactive environment for visualization, the programming function
Numerical calculations, it used in following areas
 Matrices manipulations
 Plotting of functions and data
 Algorithms Implementation
 Can interact with programs written in other languages likes C, Java C++ FORTRAN, Python
 Data Analysis
 Model Creation
 User interface Creation
Q2 – Explain about MATLAB API and what are main parts of MATLAB?
Answer:
MATLAB API Application Programming Interface is a library that enables us to write C and FORTRAN programs that interact with MATLAB.
MATLAB has 5 important parts which are given below.
 MATLAB Application programming interface API
 Handle Graphics
 MATLAB functions libraries
 MATLAB working environment
 MATLAB Language
Let us move to the next MATLAB Interview Questions And Answer.
Q3 – Explain the MATLAB commands?
Answer:
This is the basic MATLAB Interview Questions which is asked in an interview. Below is the MATLAB commands are as follows:
Session Management Commands
 help Searches for a help topic.
 whos Lists current variables (long display).
 who Lists current variables.
 quit Stops MATLAB.
 global Declares variables to be global.
 clear Removes variables from memory.
 clc Clears command window.
 look for Searches help entries for a keyword.
 exist Checks for existence of file or variable.
A command for the Systems
 path Displays search path.
 pwd Displays the current directory.
 delete Deletes a file.
 diary Switches on/off diary file recording.
 dir Lists all files in the current directory.
 cd Changes current directory.
 date Displays current date.
 delete Deletes a file.
 type Displays contents of a file.
 what Lists all MATLAB files in the current directory.
 wklread Reads .wk1 spreadsheet file.
Commands for Input and Output
 format Controls screendisplay format.
 fprintf Performs formatted writes to screen or file.
 input Displays prompts and waits for input.
 disp Displays contents of an array or string.
 fscanf Read formatted data from a file.
Plotting Commands
 axes Creates axes objects.
 close Closes the current plot.
 close all Closes all plots.
 polar Creates polar plot.
 semilogx Creates semilog plot. (logarithmic abscissa).
 semilogy Creates semilog plot. (logarithmic ordinate).
 stairs Create stairs plot.
 stem Creates stem plot.
 axis Sets axis limits.
 fplot Intelligent plotting of functions.
 grid Displays gridlines.
 plot Generates xy plot.
 print Prints plot or saves the plot to a file.
 title Puts text at top of the plot.
 xlabel Adds text label to the xaxis.
 ylabel Adds text label to the yaxis.
 refresh Redraws current figure window.
 set Specifies properties of objects such as axes.
 subplot Creates plots in subwindows.
 text Places string in a figure.
 bar Creates bar chart.
 loglog Creates loglog plot.
Array, Matrix, and Vector Commands
 reshape Changes size.
 size Computes array size.
 sort Sorts each column.
 sum Sums in each column.
 eye Creates an identity matrix.
 ones Create an array of ones.
 zeros Create an array of zeros.
 cat Concatenates arrays.
 find Finds indices of nonzero elements.
 length Computes a number of elements.
 linspace Creates regularly spaced vector.
 logspace Creates logarithmically spaced vector.
 max Returns largest element.
 min Returns the smallest element.
 prod Product of each column.
Q4: What are the operators supported by MATLAB?
Answer:
 Logical Operators
 Bitwise Operations
 Set Operations
 Arithmetic Operators
 Relational Operators
Q5: Explain the process to preallocate a nondouble Matrix
Answer:
Preallocating a block of memory for holding a nondouble matrix is memory efficient. While allocating blocks of memory for a matrix, zeros are preallocated to a matrix.The functions to preallocate memory is int8(), example matrix =int8(zeros(100));
The repmat function is used to create a single double matrix, example matrix2=repmat(int8(0), 100, 100)
Part 2 – MATLAB Interview Questions (Advanced)
Let us now have a look at the advanced MATLAB Interview Questions.
Q6: Explain the Xmath MATLAB and its features?
Answer:
For Xwindow workstations, Xmath is an interactive scripting and graphics environment.
Following are the Xmath features.
 Scripting language with OOP features.
 Libraries that are LNX and C language compatible.
 A debugging tool with GUI features.
 Colour graphics can be pointed and clickable.
Q7: What is the Mfile and MEX files?
Answer:
M files: They are just a plain ASCII text that is interpreted at runtime.
They are like subprograms stored in text files with .m extensions and are called Mfiles.
For most of the MatLab, development Mfiles is used.
MEX files: They are basically native C or C++ files which are linked directly into the MatLab application at runtime.MEX files have the efficiency to crash the MatLab application.
Let us move to the next MATLAB Interview Questions And Answer.
Q8: Tell me about some tools of MATLAB?
Answer:
 LMI control
 Neural Networks
 Robust Control
 System Identification
 Control System
 Fuzzy Logic
 Image Processing
 LMI control
Q9: about Set and Get In MATLAB?
Answer:
Get and Set are referred to as getter and setter functions. For assigning properties.
Q10: What are the function to solve Ordinary Differential Equations?
Answer:
 ODE23
 ODE45
 Quad
 Quad8
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