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How can i find the dy/dx of the differantial equation
"(My Code is correct)" To me it's not. See below for the correction (the problem is I can't see it's change the solution after ...

6年弱前 | 0

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2D moving sum of a matrix
Assuming A is your array, w is the window size % testexample A=randi(10,5) movsum(movsum(A,w,1),w,2) % or conv2(A, ones...

6年弱前 | 2

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How to avoid effect of number of extra zeros after decimal point on the equality between two arrays?
"How do I check the equality between the two arrays generated in such a manner? " tol = 2*eps(norm(y1,Inf)); norm(y1-y2,Inf)<=...

6年弱前 | 2

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Given a couple of vectors with priorities, is there a fast built-in function to find the index of the largest value?
p1 = [1, 9, 3, 8, 4, 9, 1, 9, 5, 9]; % given p2 = [5, 15, 6, 7, 10, 10, 5, 15, 1, 15]; % given p3 = [1, 25, 3, 4, 11,...

6年弱前 | 0

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computing error on least square fitting
Can i claim that the residual which is norm of (Ax-b)/b No make it norm(A*x-b) / norm(b)

6年弱前 | 0

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Smooth data to get the best approximation.
Here is what my ftting tool gives load('InputData_SmoothData.mat') pp=BSFK(XX,YY); % FEX file plot(XX,YY); plot(XX,ppva...

6年弱前 | 0

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find strings that contains a specific number of a substrings
cellfun(@(s) sum(s=='a')==2, str)

6年弱前 | 0

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fminunc gets first-order optimality of zero on iteration 0, does not find optimum
Again the step you tried might not be the step FMINUNC selects. It has a bunch of decision tree behind FMINUNC. I don't know why...

6年弱前 | 0

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How to select certain columns of a matrix only when the values in certain rows showing the the double of the value in a particular row of a column?
Mkeep = M(:,any(M>=2,1))

6年弱前 | 0

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How do i multiply 2 increasing variables
v0 = (10:1:20); theta = (30:1:40); v0_x = v0.*cosd(theta.'); % horizontal .* vertical vectors v0_y = v0.*sind(theta.');

6年弱前 | 0

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GUIDE Handle not updating
Try to put this [handles.Antenna(:).Info] = deal(readAntenna(selected,currDir)); in antennaId_Callback. (NOTE: You must call ...

6年弱前 | 0

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How to sort a array of matrix based on the maximum value
dmax = cellfun(@max, D); dmax(1) = Inf; [~,i] = sort(dmax,'descend'); D = D(i);

6年弱前 | 0

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fminunc gets first-order optimality of zero on iteration 0, does not find optimum
If your gradient is 0, then your FEM returns the exact same result for two different values of YM. This can be created by many ...

6年弱前 | 0

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interpolating the NaNs in Cell array - 180x1
y = fillmissing(y,'linear')

6年弱前 | 1

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Binning regions of a 2D matrix slices (and extending this into the third dimension)
This assumes the first/second dimensions of your matrix are divisible by 32 % Test matrix A=rand(512,128,1200); binsz = 32;...

6年弱前 | 1

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Vectorization of For loop
d = b(:,:)*a(:)

6年弱前 | 0

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Generating vector r of random noise
r = rand(1,100)*0.2 - 0.1

6年弱前 | 0

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Going back to original matrix
[~,B] = ismember(L,A,'rows')

6年弱前 | 0

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Graph is Blank ? why?
Try to add this after the statement of loading the file ich=fillmissing(ich,'nearest') and see it it fixes the issue.

6年弱前 | 0

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how to find index of string using AND operator when adding conditions
Your description is not clear to me so I give two versions idx = find(ismember(zz, {'A' 'B'})); or idx = find(ismember(zz, 'A...

6年弱前 | 1

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Strange behaviour computing l1 norm of rows of a matrix
Who build this sparse matrix B? If it's build from external source it can be not-valid. I believe there is a tool on FileExchan...

6年弱前 | 3

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Wrong Hessian output in fminunc
I guess the hessian is estimated from BFGS formula, that needs more than 1 FMINUNC iteration. In you case the minimum is reached...

6年弱前 | 0

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Undefined function 'ne' for input arguments of type 'table'.
Filefolder = find(table2array(Folderlinks)~="")

6年弱前 | 0

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y = randsample(population,k)
TMW never mentions it officially, but it's Fisher-Yates shuffle algorithm (source https://uk.mathworks.com/matlabcentral/answe...

6年弱前 | 0

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Standard deviation for a field inside a field?
arrayfun(@(s) std(s.BO.circle), structarray)

6年弱前 | 1

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find indicies of maximum and minmum elements of an array in its each segmented smaller arrays, plus mean
Test example A=1:100; indexA=[8 16 30 37 43 48 66 71 76 81 86 91 97]; Code I = zeros(siz...

6年弱前 | 1

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find minumum indices of one array in another array
A= [ 47 100 153 207 261 314 368 422 474 527 581 635 687 741 794 847 900 954 1007 1060]; B=[3...

6年弱前 | 0

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Accessing Elements in a 3D matrix using Linear Indexing ?
Given sz = [m,n,p] ans linidx is the linear index of an element, here is one way of computing the subindexes (row, col, page). T...

6年弱前 | 0

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Create surface consisting of two implicitly surfaces
"Can anyone help me with this question?" Not clear to me what exactly is the question. If you have two implicit equations for ...

6年弱前 | 0

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interpn vs griddata: how are results different?
Mathematical, in short the difference is INTERPN uses tensorial linear function on nd-hypercube that enclose the query point. ...

6年弱前 | 0