Answered
Give gradient to fmincon
If the problem is constrained, the gradient in a local extremum usually is not 0. In fact, if the gradient is non-negative on t...

4 years ago | 0

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Answered
Split one image into multiple images
Assuming you have the Image Processing Toolbox, image = [ 0 0 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 ...

4 years ago | 1

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Answered
I want to compute FFT of each segments from a 102400 length signal, where I consider the length of segment is 1024. Than store the amplitude and freq n separate array
F=fft( reshape(input,1024,[]) ,[],1); amplitude=abs(F); phase=angle(F);

4 years ago | 0

Answered
Weird problem in while loop: What is wrong with the input "48" compared to "47" and "49"????
It's because 48 is the ASCII code for '0'. double('0') char(48) 48=='0'

4 years ago | 2

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Answered
Difficulty fitting translation and rotation between two matrices of coordinate points
This FEX download handles your posted data pretty well, https://www.mathworks.com/matlabcentral/fileexchange/26186-absolute-ori...

4 years ago | 1

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Answered
curve fitting in MATLAB by using curve fitting tool
The centering/scaling means the xdata,ydata will be pre-normalized before any fitting is done. The doc is not specific about wha...

4 years ago | 1

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Answered
Solve system of equations depending on other syms variables
Plus I need to specify the variables to eliminate and not the ones that the solution should depend on. Just because you are abl...

4 years ago | 0

Answered
Solve system of equations depending on other syms variables
This version solve(eqns, [x,z]) is correct because it communicates to solve() that x is not a constant. With solve(eqns, z), th...

4 years ago | 0

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Answered
How can I use fzero on these two functions?
If you are going to transform the function, you must restrict the search to the domain where the transform is valid, f=@(x) log...

4 years ago | 0

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Estimation of variables from the inequality and equality constraints
Since there are only 3 variables, you can do a discrete sweep of the bounded box described by lb, ub to find points that satisfy...

4 years ago | 0

Answered
String with mask parameter
For example, "item" + (0:3)' + "/" + ["pump1" "pump2" "cold_valve" "hot_valve"]

4 years ago | 0

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Answered
Define a variable on a spline
n = 3; n1 = n-1; a = 20; b = 10; P = [0 b;0 0;a 0]; x = P(:,1); y = P(:,2); T ...

4 years ago | 0

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Answered
fitting parabolic looking data to an exponential function
Nothing is wrong with your code, but I recommend using the built-in 'exp1' model instead, which doesn't require a start point. ...

4 years ago | 0

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How to fit my data with a custom equation meant to come out as a parabola?
If there are 3 coefficients, you should just use polyfit(x,y,2) and forget about lsqcurvefit. No reason an iterative solution is...

4 years ago | 0

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How to find the nearest points from 2D image?
Just use pdist2 or bwdist.

4 years ago | 0

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Optimisation problem not solving for maximum values
We can easily do a discrete sweep over the allowable d and t values to see where the feasible region is, approximately. Based on...

4 years ago | 0

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How to fill the markers in a plot?
Z = readtable('https://www.mathworks.com/matlabcentral/answers/uploaded_files/1147865/Experimental_data_botheq.xlsx') ; data = ...

4 years ago | 1

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Answered
is it possible to use function without toolbox
You can also call Python optimizers from Matlab, like https://docs.scipy.org/doc/scipy/reference/optimize.html

4 years ago | 0

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find angle of propagation in matlab
https://www.cuemath.com/geometry/angle-between-vectors/

4 years ago | 0

Answered
is it possible to use function without toolbox
If you have the Matlab Compiler product, then you can deploy your code as a standalone application. Your end-users do not need a...

4 years ago | 0

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Answered
linear inequality constrains based on absolute values
The constraints correspond to a non-convex region in (as Walter's second plot shows). You would have to break it into two regio...

4 years ago | 0

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Answered
Change description in File Exchange contribution
No, there is no way to edit any part of your FEX submission without upping the version number. I'm not sure it would be a good ...

4 years ago | 0

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Remove unwanted area of image ?
A=im2gray(imread('https://www.mathworks.com/matlabcentral/answers/uploaded_files/1147135/image.png')); A(205:260,:)=[]; im...

4 years ago | 0

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Answered
RANSAC Algorithm on dense points
I would just histogram the y-coordinates of all the points. Then you can just use find() to get the first and last point where t...

4 years ago | 0

Answered
linear combination of vector and permutation
One way: A=[-1,1];B=3; [Out{1:B}]=ndgrid(A); Out=reshape( cat(B+1,Out{:}),[],B)

4 years ago | 1

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How to pair two set of coordinates together based on their Euclidean distance?
See matchpairs. The cost matrix can be obtained using pdist2.

4 years ago | 0

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Coming back from gradient using circshift for image processing
No, you cannot. Any constant image, for example, has the same "gradient", so the process cannot be invertible.

4 years ago | 0

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Answered
Given a center, sum adjacent pixels
Use interp2: value=interp2(A,14.3,10.6)

4 years ago | 0

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UseParallel for hessian?
I don't speak for MathWorks, but I think the issue is that finite difference Hessians are only relevant to the trust-region algo...

4 years ago | 0

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Why does my FFT highly depends on the resolution of the data?
The fft of a guassian should return a guassian as well. Remember, the FFT and the continuous Fourier transform are not the same...

4 years ago | 0