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Catalytic


49 total contributions since 2019

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Answered
How to curve fit an equation with sigma function
C = polyfit( sqrt( x.^2+y.^2) , Z, N)

23 days ago | 1

Answered
How can i determine the area in percentage of a clustered image?
Divide the membership of each cluster by the total number of pixels.

23 days ago | 0

Answered
Dimension of arrays being concatenated are not consistent.
Some things you urgently need to learn: https://www.mathworks.com/help/matlab/ref/dbstop.html https://www.mathworks.com/help/m...

23 days ago | 1

Answered
Plotting points in style [x1,y1] , [x2,y2], [x3,y3] and them plot all of them?
No, but you can certainly write your own wrapper for any of the plotting functions to give you the input syntax that you want.

27 days ago | 0

Answered
Index exceeds array bounds
The only solution: https://www.mathworks.com/help/matlab/matlab_prog/debugging-process-and-features.html#responsive_offcanvas

27 days ago | 0

Answered
hi every one, i need to ask a question, thank you
A=double(A); A(logical(A))=B;

2 months ago | 0

Question


Can symbolic vectors (not vectors of symbols) be defined and manipulated in the Symbolic Math Toolbox?
I would like to define symbolic functions that are functions of vector-valued quantities, like syms A x f(x)=x.'*A*x where A ...

2 months ago | 1 answer | 0

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Answered
Why does skeletonization sometimes reduce horizontal rectangles to single pixels?
Remember what bwskel is doing. It is peeling the outer pixels of the rectangles like an onion over and over again until it reach...

2 months ago | 0

Answered
Translation for an ellipsoid ?
Is there anyway to do this such that later on I need the coordinates of the rotated followed by translated ellipsoid. You can d...

2 months ago | 0

Question


Nested Functions versus Global Variables
Why are nested functions better for sharing variables between workspaces than global variables? There doesn't seem to be much di...

2 months ago | 1 answer | 0

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Answered
scatteredInterpolant in nonlinear system
In the first global declaration, etac is missing from the list. global Hm pe1 pe2 pe3 etae2 etae3 qmax1 qmax2 qmax3 %<--- add...

2 months ago | 0

Answered
Why does fplot think my function is not vectorized
Here's a workaround to trick fplot into doing the right thing.

2 months ago | 1

Answered
Correspondence between intrinsic axes and world axes for imref objects
Or is it j,i, and k like with meshgrid? It is this one, sad to say. You can check it like this M=50; N=40; P=30; ir = imref...

2 months ago | 0

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Answered
put number in cell
B=~cellfun('isempty',A)*0.2

3 months ago | 0

Answered
How to read images with positive integer? No imead()
I definitely don't get all zeros with imread. Problem solved? >> nnz(imread('C0039_100122_INDS.png')) ans = 4624 ...

4 months ago | 0

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Answered
FFT, IFFT and phase shifting
Is this what you want Xf=fftshift(fft(y)); f=fs.*((0:N-1) -ceil((N-1)/2))/N; subplot(2,1,2) stem(f,abs(Xf)/length(y)); ti...

4 months ago | 0

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Answered
Branching points problem in binary image
[I,J]= find( bwmorph(BW,'branchpoints') );

4 months ago | 0

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Answered
How do I replace missing data with other values?
isnan is the correct way to detect and replace nans. Rn=radi; Rn(isnan(radi))= ---- something else ----

4 months ago | 0

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Answered
How can I register or rotate series of image in matlab
imregister or imregtform seems like a good choice.

4 months ago | 0

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Answered
parallel computation for a for loop
parfor pi=1:NP*kkk Tempo1 = zeros( p(pi) ,1 ); Tempo1_M = zeros( p(pi) ,1); Tempo2 = zeros(q(pi) ...

4 months ago | 0

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Answered
How to Hybrid two median filters
out = medfilt2(medfilt2(yourImage))

4 months ago | 1

Answered
fitting a funciton with minimax error
Consider using fminimax.

5 months ago | 1

Answered
Error using trainNetwork. Unable to read file.
I think it is expecting more traditional types of image files like .jpg,.png, etc.. I think for .mat you need to specify a speci...

5 months ago | 0

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Answered
How to use a for-loop to find the onset (first element) of trials of zeros, ones and twos, in an array of sequences of zeros, ones and twos
No, we're not going to do your homework for you. Go away and leave us alone.

5 months ago | 0

Answered
Rotation of the circle (points)
Just add an increment to the th th = linspace(0,2*pi,10) + rotation_angle ;

5 months ago | 0

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Answered
Multiply and shift ?
R = ifftshift(xcorr(x,'unbiased'))

5 months ago | 1

Answered
FFT Peak at Zero
Apply fftshift to your spectrum to see it with DC centered in the plot. x=csvread('230.csv',1,0); rollSpectrum=ffts...

5 months ago | 1

Answered
Solving compound linear optimization problem
I've never heard of a compound optimization problem but maybe this will help https://www.mathworks.com/discovery/multiobjective...

5 months ago | 1

Question


Is this a bug in lsqcurvefit?
When I run this simple test of lsqcurvefit (this is R2018a), I get errors. opts=optimoptions(@lsqcurvefit,'SpecifyObjective...

5 months ago | 0 answers | 1

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Answered
invalid syntax at '=' . A '(' might be missing a closing ')'
if (f == 0) and same thing in this line if(~isinteger(NMAX) || NMAX == 0 || ischar(NMAX))

5 months ago | 0

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