I had applied online on the Mathworks website and I got a call from the HR after a few days. The questions were the basic 5 questions which are already posted on glassdoor.
The next round was an hour long technical phone interview. Tip: Study all the questions mentioned on glassdoor. 95% of the questions are repeated. Only if you answer 85%-90% of the questions correctly, you will be called for the next round.The same applies to the intern interview as well because this technical round remains the same. The questions are asked mostly as a rapid fire, so be well prepared and answer them to the point. Here are the questions asked to me:
MATHS
-what is an invertible matrix
-given a 3x3 matrix. Is it invertible? (Check determinant=0 condition)
-given a 2x2 matrix. Find the eigen values
-what is rank of a matrix
-given a 3x3 matrix, find the rank
-given 2 vectors, find a third vector perpendicular to both of both (Take cross product)
-given velocity v=2+3(t^2), find acceleration and position at t=4. Given initial velocity=0 at t=0
-Is integral from –Infinity to +Infinity, a definite integral or an indefinite integral?
-Find limit x->0 of sin(x)/x. Talk about L’Hospital rule
BASIC PROGRAMMING
-What is OOP?
-What is polymorphism?
-Find duplicate elements in an array
-How do you execute .exe file in Windows command prompt
-What is a recursive function
-How to you check where the program (any language) is taking more time to execute and how will you optimize it. It was a vague question.
C LANGUAGE
-What does #include mean
-Difference between <stdio.h> and “stdio.h”
-pass by value, pass by reference question when passing a character array
-difference between && and &
-inline functions. When to use and when not to?
-int a=5; float b=5/2; Is b=2 or 2.5? Why?
-One line of C code to identify whether a number is odd or even apart from using ‘number%2==0’ method
-Difference between struct and union
MATLAB
-Meaning of matrix A.^2 and A^2.
-When do you use % and when do you use ‘!’ in MATLAB
-What does @ mean in MATLAB
- errors while executing m file e.g. function not present or incompatible data arguments. Why are they encountered? How to fix them?
-Extract every 3rd element in an array of 100 elements
-syntax to plot (1,11), (2,22),(3,33) on the same plot. Also add green color and ‘*’ for the plot
-how to add xlabel and ylabel to the graph
-how to add path
-if you have variables a,b,c in the workspace. Delete only b
SIGNAL PROCESSING
-Nyquist criterion
-IIR versus FIR
- Impulse to a linear discrete system, h[n] = [1 2 3 5 10]. Input signal frequency = 100Hz, what is the output frequency?
-Why do you feel a bicycle wheel is moving rotating backwards when actually the bicycle is moving forward?
-Difference between Continuous time fourier transform and DTFT
-location of poles in a unit circle or outside. Talk about the stability.
-is y[n]=x[n^3] time invariant?
-what is a random process? What is autocorrelation?
-h[n]=[4,0,1,0,2]. Find Z transform with starting point as the second element(arrow on second element)
-Spectrum of x[n] multiplied by y[n] where x[n]=5n and y[n]=delta(n-4)