Programs

Most Asked Matlab Interview Questions & Answers [2023]

MATLAB is a crucial programming platform for aspiring data science and machine learning specialists. We’ve compiled a collection of the most frequently asked MATLAB interview questions and their solutions to aid your preparation. Continue reading to learn more about what’s in store.

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1. What exactly is MATLAB?

MATLAB stands for MATrix LABoratory, an open-source software/API designed for mathematical computations, such as matrix operations. The software’s most recent version can handle a wide range of sophisticated computations, including data analysis and visualisation, scientific and engineering graphics, etc. Simulation and modelling are two of their most significant characteristics.

2. In MATLAB, how do you call a function?

In MATLAB, a function can be called by the name you give it, but the user must type it in the New Script tab under the File Tab. After that, you may just write the function’s name in the code field to call it.

>> function_name (in the work area)

3. What is the meaning of the MATLAB API (Application Program Interface)?

The MATLAB API is a library that allows interfacing with MATLAB using Fortran and C applications. It has functions for calling MATLAB routines, reading and writing Mat files, and using MATLAB as a computational engine.

4. What is the working environment in MATLAB?

The collection of instruments and assistance in MATLAB enables clients and programmers to manage variables in the workspace and import and export data. The environment also contains utilities for creating M-files and maintaining, debugging and profiling them for MATLAB programmes.

5. What is the best way to manage graphics in MATLAB?

The MATLAB graphic system includes high-level commands for data visualisation in two or more dimensions, image processing, animation, and display graphics. In addition, it includes low-level commands to extensively tweak the visual presentation and create comprehensive GUIs for programmes.

6. What exactly is Simulink?

Simulink is a MATLAB add-on to model and analyse dynamic systems in an interactive and simulating graphical interface.

7. What is the difference between ‘Get’ and ‘Set’ in MATLAB?

The functions Get and Set are called getter and setter functions, respectively. Setter functions are used to assign attributes, whereas getter functions are used to obtain features.

10. What is the purpose of MATLAB?

The MATLAB programming language is a high-level matrix programming language that includes functions, control structures, data structures, input or output, and object-oriented programming (OOP). The MATLAB API allows you to interface with MATLAB through C and FORTRAN applications. It is used for various industry-level design procedures and operating control systems, automation of various equipment, and establishing a specific set of codes for an item.

11. What is the best way to run MATLAB code?

Note: Before running any code, save the relevant code to protect the progress. Once a code has been saved, it may be run in MATLAB using the Save and Run button on the home tab or the F5 key on your keyboard.

12. How do I read a picture from a folder in MATLAB?

The following is a syntax for reading images from any folder:-

D = ‘directory where the files are saved’;

S = dir(fullfile(D,’name*.jpg’)); % pattern to match filenames.

for k = 1:numel(S)

F = fullfile(D,S(k).name);

I = imread(F);

imshow(I)

S(k).data = I; % optional, save data.

end

 

13. Is it possible to use multi-dimensional arrays in MATLAB?

No, it isn’t compatible. However, it can work with two-dimensional matrices. In addition, the programmer can write their own functions to use multi-dimensional array characteristics depending on the application.

14. What is the best way to implement a neural network in MATLAB?

An adaptable system that learns by employing linked nodes or neurons in a layered structure mimicking a human brain is known as a neural network. Neural network redeems training to identify patterns, categorise data, and predict future events by learning from data.

It abstracts the input by breaking it down into layers. It can be trained to detect patterns in voice or images using a variety of examples. The way its various pieces are linked, and the strength of those connections, determine its behaviour. MATLAB allows you to create neural networks with just a few lines of code.

There are seven main steps in the generic neural network design process:-

  • Collect information
  • Construct a network
  • Set up the network
  • Set the weights and biases to their default values
  • Educate the network
  • Verify the network (post-training analysis)
  • Make use of the internet.

MATLAB and Deep Learning Toolbox provide command-line tools and applications for creating, simulating, and training external neural networks. The tools build neural networks for tasks like classification, regression (including time-series regression), and clustering a breeze. In addition, you may develop MATLAB code to record your work and automate operations when you create your networks with these tools.

15. In MATLAB, what do you mean by M-file?

M-files are simply plain ASCII scripts parsed at runtime. These are subprograms in text files with.m extensions, referred to as M-files. The majority of MATLAB development, as well as platform independence and maintainability, is done through M-files. It’s only parsed once and compiled “just-in-time,” but it’s also transparent to the consumer.

16. What are MEX files, exactly?

MEX files are native C or C++ files dynamically linked into the MATLAB program at runtime. It allows MATLAB to run C, C++, and Fortran applications and requires compilation for each hardware configuration.

17. In MATLAB, how do you declare an array?

Use the following syntax to declare an array in MATLAB:

A = [1 2 3 4 5]

It generates a 1X5 array.

It can also be specified using the syntax:

N=[1,2,3,4,5]

It also makes a 1X5 dimensional array.

18. What exactly is a P-code?

The Pcode file is a produced and encoded M-file that keeps track of the function’s load time. This is unlikely to be an issue except for large M-files because most are only processed once. Pcode also allows us to keep the source code hidden from other people. Pcode cannot be changed back to the M-file source. Pcode is platform agnostic.

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Conclusion 

For anyone interested in a career in science, mathematics, engineering, computational biology, physics, or data-driven finance, MATLAB is essential. If you’re searching for a job that involves MATLAB, you’ll need to practice answering MATLAB simulink Interview Questions. Each interview is unique based on the job profile, but you must thoroughly understand MATLAB to pass the interview. 

Is MATLAB more complex than Python?

MATLAB is the most user-friendly and productive computing environment for engineers and scientists alike. MATLAB is the only high-level programming language devoted to mathematical and technical computers. On the other hand, Python is a multi-purpose programming language.

What programming language is MATLAB developed in?

MATLAB has a much easier coding language than other languages and allows selecting a programming language. It has built-in compilers for most common programming languages, including C, C++, and Java.

Is it possible to run MATLAB without graphics?

We may occasionally wish to execute scripts that include plotting commands without displaying the plots or commenting on the commands in the script.

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