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Top Matlab interview questions and answers for freshers and experienced
What is Matlab ?
MATLAB is a high-level language and interactive programming environment for numerical computation and visualization developed by MathWork
Questions : 1 :: Explain what is MatLab? Where MatLab can be applicable?
MatLab is a high-level programming language with an interactive environment for visualization, numerical computation and programming function.
Matlab can be applicable at numerous instances...View answers
Questions : 2 :: What does MatLab consist of?
MatLab consists of five main parts
• MatLab Language • MatLab working environment • Handle Graphics • MatLab function library • MatLab Application Program Interface...View answers
Questions : 3 :: Explain MatLab API (Application Program Interface)?
MatLab API is a library that enables you to write Fortran and C programs that interact with MatLab. It contains the facilities for calling routines from MatLab, for reading and writing Mat files and...View answers
Questions : 4 :: What are the types of loops does Matlab provides?
Matlab provides loops like
• While Loop • For Loop • Nested Loops
Questions : 5 :: List out the operators that MatLab allows?
Simulink is an add-on product to MatLab, it provides an interactive, simulating, graphical environment for modeling and analyzing of dynamic systems.
Questions : 7 :: In MatLab is it possible to handle multi-dimensional arrays?
No, it is not possible in MatLab to handle multi-dimensional arrays. Matlab’s internal data structure is limited to a two-dimensional matrix. But to handle multi-dimensional arrays in Matlab,...View answers
Questions : 8 :: Mention what is the sign convention used in MatLab's fft routines?
The sign convention used in MatLab’s fft routines are defined as sum(x(i)*exp (-j*i*k/N)) and not sum (x(i)exp(j*i*k/N)). The first version is used by engineers, and the second is used by...View answers
Questions : 9 :: What are the four basic functions to solve Ordinary Differential Equations (ODE)?
The four basic functions that MatLab has to solve ODE’s are
• Quad • Quad8 • ODE23 • ODE45
Questions : 10 :: Explain how polynomials can be represented in MatLab?
A polynomial in MatLab is denoted by a vector. To create a polynomial in MatLab enter each co-efficient of the polynomial into the vector in descending order
Questions : 11 :: What is the type of program files that MatLab allows to write?
Matlab allows two types of program files
• Scripts: It is a file with .m extension. In these files, it writes series of command that you want to execute together. It does not accept inputs and...View answers
Questions : 12 :: Explain how to modify the MatLab Path?
To modify the MatLab Path use the PathTool GUI. Also, you can use add path directories from the command line and add the path to rc to write the current path back to ‘pathdef.m.’ In the...View answers
Questions : 13 :: Explain what is LaTex in MatLab?
MatLab handles naturally simple LaTex encoding which allows introducing greek letters or modifying the font size and appearance in plots.
Questions : 14 :: Explain how you can pre-allocate a Non-Double Matrix?
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...View answers
Questions : 15 :: What is Xmath-Matlab? Mention the Xmath features?
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...View answers
Questions : 16 :: Name the graphic system used in MatLab?
Graphic system used in MatLab is known as handle graphics. It has a high level and low-level commands.
• High Level Commands: High level command performs image processing, data visualization...View answers
Questions : 17 :: Explain what is M-file and MEX files in MatLab?
M files: They are just a plain ASCII text that is interpreted at run time. They are like sub-programs stored in text files with .m extensions and are called M-files. For most of the MatLab,...View answers
Questions : 18 :: Explain what is Interpolation and Extrapolation in Matlab? What are their types?
• Interpolation: Taking out function values between different data points in an array is referred as Interpolation
• Extrapolation: Finding function values beyond the endpoints in array is...View answers
Questions : 19 :: List out some of the common toolboxes present in Matlab?
Some of the common toolboxes in Matlab are
• Control System • Fuzzy Logic • Image Processing • LMI control • Neural Networks • Robust Control • System...View answers
Questions : 20 :: What is Get and Set in Matlab?
Get and Set are referred as getter and setter functions. For assigning properties, setter functions are used while for accessing properties getter functions are used.
Questions : 21 :: How can we index a MATLAB array returned by a function without first assigning it to a local variable?
It actually is possible to do what you want, but only if you use the functional form of the indexing operator. When you perform an indexing operation using (), you are actually making a call to the...View answers
Questions : 22 :: Why is 24.0000 not equal to 24.0000 in MATLAB?
The problem you're having relates to floating point comparison. The numbers differ by very small decimal amounts. You would have to do the comparisons by checking that the values are within some...View answers
Questions : 23 :: How to get all files under a specific directory in MATLAB?
Here's a function that searches recursively through all subdirectories of a given directory, collecting a list of all file names it finds:
function fileList = getAllFiles(dirName)
dirData =...View answers
Questions : 24 :: Matrix of unknown length in MATLAB?
if the number of columns is fixed you can always add rows to your matrix (inside the loop)
new_row =[x y];%new row with values x & y
mat =[mat ; new_row];
Questions : 25 :: Why is MATLAB so fast in matrix multiplication?
Here's my results using MATLAB R2011a + Parallel Computing Toolbox on a machine with a Tesla C2070:
>> A = rand(1024); gA = gpuArray(A);% warm up by executing the operations a couple of...View answers
Questions : 26 :: How to elegantly ignore some return values of a MATLAB function?
This is somewhat of a hack but it works:
First a quick example function:
Func3=@() deal(1,2,3);[a,b,c]=Func3();% yields a=1, b=2, c=3
Now the key here is that if you use an variable twice in the...View answers