# Naman Chaturvedi

### MathWorks

Application Support Engineer at Mathworks India Pvt. Ltd.

Any comment made here is solely my opinion and owned by me. Mathworks is not responsible for whatever I say.

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**Content Feed**

Apply a colored filter on grayscale image?

You grayscale image (say iRed) is a m*n*1 matrix. (m, n are x and y dimensions). To make the grayscale image iRed to redscale im...

4 years ago | 0

| accepted

How can i change the step input to cubic polynomial curve in simulink

PFA. I made 45(t^3)/125 signal. Hope this helps.

4 years ago | 0

Doubt regarding processing of Upsampling and Downsampling Data in an Image.

Theoritically speaking, yes. You will actually be using just 25% of your original image's data points (50% in x, 50% in y). But ...

4 years ago | 0

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ECG signal filteration required

You can use the method mentioned in https://www.mathworks.com/help/signal/ug/remove-the-60-hz-hum-from-a-signal.html and use a b...

4 years ago | 0

How can i connect simulink and matlab together?

The variables K1-K6 should just be present in the base workspace and Simulink will pull the values from there. If you have a fun...

4 years ago | 1

Mesh Plot from Data Points

Hi Garret, To use surf(x,y,z), x, y and z should be matrices of the same size.Also, as you may know, the x, y and z are from th...

4 years ago | 0

What will be the specifications for designing 50/60 Hz Analog Low Pass Filter in Simulink?

It really depends on your use case. For instance, Chebyshev filter gives a faster roll-off rate than Butterworth by allowing mor...

4 years ago | 1

| accepted

How to use latin hypercube sampling? Neural network optimization help?

Since your simulation is quite time consuming and you are considering sampling methods as well, I would suggest an approach like...

4 years ago | 1

trapz errors in compiled code but not script

From the documentation of trapz(https://www.mathworks.com/help/releases/R2018a/matlab/ref/trapz.html): Q = trapz(X,Y) integra...

4 years ago | 0

How to fix remote Matlab display resolution when using ssh -X?

You can try using Painters as a renderer only instead of OpenGL. Use -noopengl flag while opening MATLAB from the command line t...

4 years ago | 0

How can I delay a chirp signal for signal processing?

t=1; delay=t*1e3; %delay of 1 seconds z=zeros(1,delay); %delay is the no. of delay samples signal=[z,signal]...

4 years ago | 1

| accepted

I want to detect flowers of two kinds of plants,what kind of features I should extract in such images?

For this particular problem, you can check the standard deviation in all the three color spaces and identify the flower based on...

4 years ago | 0

| accepted

Plot multiple realizations of a Makrov chain in the same plot

<https://www.mathworks.com/help/matlab/ref/hold.html hold on>

4 years ago | 0

I use xlswrite and xlswritespec all the time. I am having a specific problem with xlswrite (see below)

Did you make sure that the file is not open? xlswrite() actually launches Excel and tries to open the file. So if you have t...

4 years ago | 0

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3D axis rotation with meshgrid

You aren't plotting the updated values X and Y. Last line should be:- >> contourf(X,Y,B,25,'LineStyle','none')

4 years ago | 0

MATLAB Autoscaling Issue for Constant Numbers

You can use <https://www.mathworks.com/help/matlab/ref/axis.html axis> and <https://www.mathworks.com/help/matlab/creating_plots...

4 years ago | 0

Turn off plot confidence bounds

The plot p shows the data, the fit and the confidence handle. The visibility of the confidence bounds lines can be set to 'off' ...

4 years ago | 1

chi2pdf WITHOUT using a for loop

Element wise multiplication can be performed using the '.*' operator. So, if you have two matrices say X (n x m) and y(n x m) an...

4 years ago | 0

Restore sinusoid signal data

One way would be to find the frequency of the signal from the clean part of the signal by calculating the distance between the f...

4 years ago | 1

Is the result from xcorr(zscore(X),zscore(Y), 'coeff') the same as correlation coefficient for each lag position?

Yes, you are correct. It does give the correlation coefficients for the every lag values. By using 'coeff' the following changes...

4 years ago | 1

| accepted

Cell detection and segmentation on image with uneven background and low resolution

Try texture segmentation and then the cell detection and segmentation. Check out <https://www.mathworks.com/campaigns/offers/ima...

4 years ago | 0

| accepted

How to add the strings in three for loops

Correct code: ht=cell(3,1); for i=1:3 for k=1:3 for m=1:3 if (k*m==1) ...

4 years ago | 0

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FFT Transform on vectors

This should help. For sliding window; % x=signal % A=output array % shift=shift of sliding window % windowlen=w...

4 years ago | 0

How i can generate clean %50 duty square waves ?

You can try improving the samples per cycle and making your signal more sharp as long as it obeys the size limits, if you still ...

4 years ago | 0

Variable Step between only two values

You can use the sim command to simulate the model from a start time, to a stop time and with a time step. Eg:- If your simulatio...

4 years ago | 0

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How can I fix this error?

You are getting the error because after performing 'y=diff(y)', y becomes '[]' which makes the RHS '[]' as well. The correct cod...

4 years ago | 0

Mux a variable number of signals without mux block

I hope something like this would solve your problem. <</matlabcentral/answers/uploaded_files/131470/mux.png>> I have used ...

4 years ago | 0

Combining symbolic integral expressions

Hi Randolf, To check the validity of K==L, you must expand the equation and then simplify it as shown: >> logical(simpli...

4 years ago | 2

Can anyone tell me how to calculate this integration using integral2? I am using the below code but not getting the desired result.That is why I want to use integral2.

If f1 is your t_A and x,y your variables, you can use >> F=@(x,y) f1(x,y).*exp(-i*2*pi*(x*u+y*v)/(lambda*f)); >> I=int...

4 years ago | 0

How do I plot three waves (sin, triangle, and square) with a Vp-p of 4V and the function generator set at 1KHz

If its MATLAB you want to plot it in, f=1000; t=0:0.00001:0.002; s=2*sin(2*pi*f*t); tr=2*sawtooth(2*pi*f*t); sq=2...

4 years ago | 0