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Ajay Pattassery


MathWorks

110 total contributions since 2019

I am an Application Support Engineer at Mathworks.
I am interested in Communication, Signal Processing and Deep learning.

DISCLAIMER:Any advice or opinion here are my own, and in no way reflect that of Mathworks.

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Answered
Using subs on contents of a cell
You can substitute I1 with I_val and I2 with I_val seperately. I = subs(cell2sym(I),I1,I_val); But once you do substitution w...

environ un mois ago | 0

| accepted

Answered
how can I silently uninstall MatLab R2017
Hi, The following link will be useful. https://in.mathworks.com/matlabcentral/answers/100721-how-do-i-use-the-silent-uninstall...

environ un mois ago | 0

| accepted

Answered
How can I genereate only one h file?
Hello, You can have a single header file modelname.h as codegen output by setting the File packaging format in Simulink Model C...

environ un mois ago | 0

Answered
Expressing a matrix with parameters and letters
Define the variables F1, F2, and F3 as symbolic variables. syms F1, F2, F3 B = inv(A); b = [0 F1 0 F2 0 F3 0 0 0 ]’; x = B*b...

environ un mois ago | 1

| accepted

Answered
Histogram with different sized bins and edges to illustrate wave periods
The following code will plot the above bar graph waveperiods = (9:21); observations = [1 5 14 22 28 5 6 2 1 0 1 0 0]; groups ...

environ un mois ago | 0

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Answered
Unable to play audio because no audio outputs were found
If you just want to play the music in MATLAB Online, you could use ‘sound’ instead. But it will have lesser capabilities compare...

environ un mois ago | 0

Answered
finding sub sequences of a data set
I assume you want to extract a sub-vector of length 30 from each row. But the total length of the column is 129 which is not div...

environ un mois ago | 0

Answered
Need to assign values to variable in a vector
The subs function helps in doing the symbolic substitution. The following snippet will do the substitution. x1=input("Please In...

environ un mois ago | 0

Answered
Simulink modeling from the command line
Refer to the following MATLAB Answer. Question 2 addresses the above query. https://in.mathworks.com/matlabcentral/answers/1011...

environ un mois ago | 0

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Answered
Input folders or files do not contain specified file extensions:
Here if you do not define the ReadFcn explicitly, the default function used is imread() which is not supported for .nii extensio...

environ un mois ago | 1

| accepted

Answered
Inserting Bounding Boxes when it is more than two together
A simple if condition before displaying the annotation will do if (size(bboxes,1) > 1) for ii = 1 : size(bboxes, 1) ...

environ un mois ago | 0

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Answered
alt key in live script
You can disable the toolbox mnemonics by executing the following command. com.mathworks.desktop.mnemonics.MnemonicsManagers.get...

environ un mois ago | 3

Answered
How to plot PWM signal with specific duty cycle and frequency ?
The following answer explains how to generate a square wave in Matlab with frequency,​amplitude,​voltage offset, and duty cycle....

environ 2 mois ago | 1

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Answered
rand(n,1)
It is difficult to reason why exactly three different pairs generated from the above information. Atleast from MATLAB R2012a on...

environ 2 mois ago | 0

Answered
Question of FFFT in Matlab
The frequency of the sine wave is defined as 128 Hz (f = 128) in the above code. Hence there will be two impulses (ideally, but ...

environ 2 mois ago | 0

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Answered
Editing y limits for multiple axes using property inspector
The properties of both the axes can be edited by using the property inspector. If the right axes property needs to be edited, f...

environ 2 mois ago | 0

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Answered
Audio Record Object Empty when trying to start/stop with buttons in AppBuilder
Here the recObj is local to the function RECORDButtonPushed and its scope is limited to that function. Hence it is not accessibl...

environ 2 mois ago | 1

Answered
Bug with conv2
The above output from conv2 with the argument as 'valid' is expected. If you are computing in the paper the kernel needs to be ...

environ 2 mois ago | 1

| accepted

Answered
Not defining backward loss leads to an 'Abstract classes cannot be instantiated' error. Why is that?
I think your MATLAB version is R2019a or earlier and you are referring to the documentation of R2019b. In MATLAB R2019a and ear...

environ 2 mois ago | 0

Answered
Error when building a array code
Hello, The error is generated since the right hand side of zm3(i,j+1) = rain(:,:,2+yr*38); is a matrix with dimension 141x71...

environ 2 mois ago | 0

Answered
How can I create a column matrix whose elements are unknown variables
If you know n, then you could define a column vector as vector = zeros(n,1); Later you can assign the values for each position...

environ 2 mois ago | 0

Answered
How to separate the elements of a table with their names?
I am not sure of getting rid of the for-loop. But the following code can achieve what you are looking for neatly. Assume T is ...

environ 2 mois ago | 0

Answered
Centered FFT & DFT: cannot devise required phase shift vector(s).
fftshift will shift the zero frequency components to the center of the spectrum.

3 mois ago | 0

Answered
How to change vertical alignment on worldmap figure?
The following code will move the meridian (longitude) labels to ‘baseline’ position. load korea map_axis = worldmap(map, ref...

3 mois ago | 0

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Answered
How to create a bounding box with a right angled triangle.
I assume that a bounding box is needed to be drawn over a right-angled triangle. x1 = [0 1 0]; y1 = [0 0 1]; polyin = poly...

3 mois ago | 0

Answered
How to find cells corresponding to zero lag in an autocorrelation function
The zero lag produces the highest value in the autocorrelation output. Hence simply finding the maximum value of the autocorrela...

3 mois ago | 0

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Answered
anyway to call checkbox in appdesigner programmatically?
I assume that you have already created a checkBox in app-designer, and you want to check or uncheck the checkBox programmaticall...

3 mois ago | 1

Answered
Why doesn't audiowrite write metadata (title, etc) to wav file?
Refer similar question, https://in.mathworks.com/matlabcentral/answers/480095-audiowrite-function-is-not-saving-the-title-or-ar...

3 mois ago | 0

Answered
Audiowrite function is not saving the title or artist information
The MATLAB function audiowrite correctly writes the title as well as Artist information to the file created. You can verify the ...

3 mois ago | 1

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Answered
create gui using matlab
You can implement the GUI using MathWorks App Designer. Invoke App Designer by entering appdesigner in MATLAB Command Window an...

4 mois ago | 0

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