## Introduction to MATLAB Interview Questions And Answers

MATLAB is a high-level programming language that 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.

#### Matlab

Matlab 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 the following things Integration, Transforms, Curve Fitting, Data Analysis, statistics, 3D, 2D plotting, Linear algebra, Non-linear algebra, graphics, nonlinear function calculations of differential equations.

#### Features

- It is a high-level level and 4th generation language used for application development, Numerical calculations.
- It provides an interactive environment for iterative searching, design, and problem-solving.
- 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 a custom graphical user interface.

#### Uses

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 that 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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#### 1. What is MATLAB and what are its uses?

**Answer:**

MATLAB is a high-level programming language that was developed by MathWorks in 1970 It has an Interactive environment for visualization, the programming function

Numerical calculations, it used in the 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

#### 2. Explain about MATLAB API and what are the 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.

#### 3. Explain the MATLAB commands?

**Answer:**

These 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 the existence of a 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 the 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 screen-display 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 x-axis.
- ylabel Adds text label to the y-axis.
- 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.
- log-log Creates log-log 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.

#### 4. What are the operators supported by MATLAB?

**Answer:**

- Logical Operators
- Bitwise Operations
- Set Operations
- Arithmetic Operators
- Relational Operators

#### 5. Explain the process to pre-allocate a non-double Matrix

**Answer:**

Pre-allocating a block of memory for holding a non-double matrix is memory efficient. While allocating blocks of memory for a matrix, zeros are pre-allocated to a matrix.The functions to pre-allocate 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 Interview Questions.

#### 6. Explain the X-math MATLAB and its features?

**Answer:**

For Xwindow workstations, Xmath is an interactive scripting and graphics environment.

Following are the X-math 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.

#### 7. What is the M-file and MEX files?

**Answer:**

M files: They are just plain ASCII text that is interpreted at runtime.

They are like sub-programs stored in text files with .m extensions and are called M-files.

For most of the MatLab, development M-files 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.

#### 8. Tell me about some tools of MATLAB?

**Answer:**

- LMI control
- Neural Networks
- Robust Control
- System Identification
- Control System
- Fuzzy Logic
- Image Processing
- LMI control

#### 9. About Set and Get In MATLAB?

**Answer:**

Get and Set are referred to as getter and setter functions. For assigning properties.

#### 10. What are the function to solve Ordinary Differential Equations?

**Answer:**

- ODE23
- ODE45
- Quad
- Quad8

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