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why putting a variable in a matrix divide it?
It is a 2x2 matrix, even though you might not like how it gets rendered in the Command Window. If it were not really a 2x2 matri...

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Two functions optimization and curve fitting
Either you have a bad initial guess, or a bad model. If the latter is true, we cannot help you. If the former is true, it may he...

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How to replace elements of one dimension of an n-D matrix based on values in the same dimension of another n-D matrix of equal dimensions?
x( y(:,1,:)==1 & (1:width(y))==1 ) = 99;

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How to replace elements of one dimension of an n-D matrix based on values in the same dimension of another n-D matrix of equal dimensions?
Possible? Yes. Advisable? Not so sure. x(:,1,:)=x(:,1,:).*(y(:,1,:) ~= 1) + 99*(y(:,1,:) == 1);

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Estimate different trend lines and its slopes from a set of points
This FEX download, https://www.mathworks.com/matlabcentral/fileexchange/25872-free-knot-spline-approximation?s_tid=ta_fx_result...

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I have to optimise an objective function within defined limits
You can set any nonlinear constraint functions that you want, though ideally it would be continuously differentiable. However, b...

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Fill a specific region of fcontour without generating a mesh
Using the FEX download getContourLineCoordinates, fun=@(x,y)x.^2+y.^2-1; M=fcontour(fun,[-pi pi -pi pi],'LevelList',[0,1,2...

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How do you convert the left picture (a) into the right picture (b) using image processing toolbox?
[R,G,B]=imsplit(imread('Image.png')); BW=imfill( bwareaopen(R>130 & G>130 & B>110,10) ,'holes'); imshow(~BW)

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Optimizing a matrix of values
You could define the whole matrix as unknown, but with diagonal elements bound to zero: LB=-inf(n); LB(1:n+1:end)=0; UB=-LB;...

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groupcounts and sum of data in another array in the same order
accumarray(findgroups(A(:)), B(:))

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groupcounts and sum of data in another array in the same order
splitapply(@sum,B,findgroups(A))

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How to find the optimum number of neurons and hidden layers for ANN?
By trial and error, though you can automate some of that using the Experiment Manager.

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how to enlarge ROI around its boundary?
Isn't there something available that operates directly on the position data of Matlab ROI objects...? You can make a polyshape ...

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Trying to use function ,didnt work?
when i typed it like this it gave me error I doubt it gave you an error. It certainly doesn't give me one. You probably got a ...

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How to use least-square fit and gaussian surface for 3D data?
This FEX file will fit a Gaussian with a constant background in any dimension, https://www.mathworks.com/matlabcentral/fileexch...

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Input multiple region for polyshape
There is no unique way to divide a series of points into closed polygons. If you haven't inserted the NaNs already, the intended...

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Function that makes Anonymous Functions
When I attempted this, the anonymous function contained variables instead of numerical coefficients I assume you mean that in t...

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Why does argmin index of NaN array have a value of 1 and not NaN?
I imagine it is so that the logical test tf (below) will always return true. If the I output were NaN, an error message would r...

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How to open neural network training screen?
I don't know what you mean by the "net.mat file" and I don't think you can reopen the screen. However, if you called trainlm wit...

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Numerical first derivative of irregularly spaced data
It seems to work: t=sort( rand(1,1000)*2*pi ); cos_t=gradient(sin(t))./gradient(t); I=1:20:1000; plot(t,cos(t),'b--' , t...

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removeLayers function: Incorrect number or types of inputs or outputs for function removeLayers.
Your layers variable is a Layer object array, whereas removeLayer requires the input to be a LayerGraph. It is unnecessary, in a...

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Generating numbers whose sum is 1 during genetic algorithms optimization
lb=zeros(12,1); ub=lb+1; Aeq=ub'; beq=1;

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How to open new command window?
You can launch a new Matlab session with its own command window, but the way you are going about saving work is very peculiar. M...

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Speeding up interpolation with scattered interpolation
Your data is gridded, so you should be using griddedInterpolant, as opposed to scatteredInterpolant. Gridded interpolation is mu...

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Why does abs cause bad matlabfunction evaluation?
It is not the matlabFunction version that is evaluating things badly. It is the first version, with the double application of su...

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Show img in coordinate system and perform transformations
I=flipud(imread('peppers.png')); T = [1 0 2 1]; T(3,3)=1; [Iw,R]=imwarp(I, affine2d(T')); h=imshow(Iw); ax...

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Supply partially complete Jacobian for fsolve()
and let MATLAB use its own numerical methods for the missing ones? fsolve cannot be made to do finite difference calculations ...

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Sum of following elements in array
sum_following = cumsum([s(2:end),0],"reverse");

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How to deal with files in which rows have different numbers of columns
I think you would probably have to read the file in as a string array using readlines, and then do your own text parsing.

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plot strain ellipse and principal stress axes using eigenvalues and eigevectors.
a=10; %long axis b=3; %short axis theta=30; %rotation angle p=rotate( scale(nsidedpoly(1000),[a,b]) ,theta); plot(p)

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