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# Stephen Cobeldick

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6.961 total contributions since 2014

Suspensa Vix Via Fit

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Format Array column in fprintf
The short answer is: not easily. Your output example has varying numbers of fractional digits 0.000000 % six decimal places 4...

alrededor de 16 horas ago | 0

Preallocating a cell array of chars?
A = cell(3,1); A(:) = {''} This assigns one scalar cell (on the RHS) to all of the cells in the array A: https://www.mathwork...

alrededor de 18 horas ago | 0

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Format number in fprintf
I am guessing that unlike your example you actually want the columns to be aligned, e.g. where M is your matrix: >> fprintf(' %...

alrededor de 18 horas ago | 0

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How do I replace Matrix elements
Use AND instead of OR: >> A = [-1,0,4,6;1,1,0,2;-7,0,5,0;5,1,5,1] A = -1 0 4 6 1 1 0 2 -7 0 5 0 ...

alrededor de 22 horas ago | 0

How can I get the secondary diagonal of a matrix?
diag(fliplr(A))

alrededor de 22 horas ago | 0

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Find words common across multiple string cells
My ancient version does not support strings, so I used cell arrays of character vectors, but I would expect that this should wor...

1 día ago | 0

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Function with Non Constant Variable
You could create an anonymous function: fun = @(x) S(3,1,x,2); .. fun(17)

1 día ago | 0

How can I change the first row of my matrix to all 0s using a for loop?
Where M is your matrix: M(1,:) = 0;

1 día ago | 0

How to form a structure array variable?
Simpler using indexing: vec = {'a','b','c'}; Test{1}.(vec{Ind}) https://www.mathworks.com/help/matlab/matlab_prog/generate-fi...

1 día ago | 0

How to I create a function handle through recursion?
I don't see any reason why you need any recursion, basic vectorized code works just fine: V = 0:size(A,1)-1; F = sum(A(:,1).*t...

1 día ago | 1

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Automatisation of .mat files load and storing into a matrix
N = 20; C = cell(1,N); for k = 1:N F = sprintf('dx00%d.mat',k); S = load(F); C(k) = struct2cell(S); % if there ...

2 días ago | 0

Importing files in the right order
"Any simpel way to make this happen?" Method one: The simplest way is to rename the files with sufficient leading zeros, e.g. ...

2 días ago | 0

saving workspace of each pair of variable in a loop
for ii = 1:numel(X) for jj = 1:numel(Y) ... your code fnm = sprintf('workspace_%d_%d.mat',ii,jj); ...

2 días ago | 0

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Matrix comparison with unequal sized matrices
N = nnz(B(1:end-1)>A(2:end)) Tested: >> A = randi(9,1,5) A = 2 5 7 2 6 >> B = randi(9,1,5) B = 3 9 5 ...

2 días ago | 0

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Why a matrix multiply a variable and then be divided by the same variable produce different results?
"I am confused by the code show above, b is just a number, so why the matrix multiply b and then divide the same b (line 5) woul...

2 días ago | 1

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find text in text file

3 días ago | 0

Unknown error in my m.function
There are a few combinations of values for which your function does not define the output argument. If you call the function wit...

3 días ago | 0

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How to turn off text interpreter when plotting timeseries objects
One approach would be to set the interpreter for the entire figure before plotting (and reset it again afterwards): https://www...

3 días ago | 0

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I have multiple files. I need to combine info in the files.
As Rik suggested: av = a(:); bv = b(:); [X,Y] = ndgrid(1:10); M = [av(X(:)),bv(Y(:))]

3 días ago | 0

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reshape vector to matrix
A general solution for an arbitrary number of rows and columns: >> d = [1,2,3,4,5]; >> r = 4; >> m = hankel(d(1:4),d(r:end)) ...

3 días ago | 0

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combination of tables across columns
Where T1 and T2 are your two tables: T = [T1,T2]; T = T(:,[1,4,2,5,3,6])

3 días ago | 0

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Not enough input arguments
"Why is it said not enough input arguments at momentum1 = zeros(size(W1)); ?" Because you called the function without any input...

3 días ago | 0

A loop for sorting tables
tblA = sortrows(Table1,{'Variable','Value'}); for k = 1:40 % or whatever the max 'variable' is. vnm = sprintf('Variable %d...

5 días ago | 1

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I there a way to call variables from my workspace into the genetic algorithm tool? (Without calling them from the fitness function)
"Is it possible to have variables in my fitness function (data.Die and data.DiePD in my case) that are in my worspace without ha...

5 días ago | 1

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using a value to find index in a matrix?
The simplest solution is to simply check for equality: idx = x==Matrix_A; which will return a logical array with true in every...

6 días ago | 0

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Extract unknown number of vectors from matrix
" num2cell would create separated cells with the n vectors of size, but sub2ind also does not run on cells." True, but you can ...

6 días ago | 0

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code to load my files from folder, add workspace variable and save to another folder
You don't need to load the file data, you can use save's '-append' option: fs = 128; for ... loop over all files, you need to ...

6 días ago | 1

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exceeded number of array elements
Ru is scalar, but in multiple locations you try to access Ru(2), e.g.: for u = 1:2 xX{u} = @(Beta) Ru(u)*cos(Beta) + sqrt( R^2...

6 días ago | 1

How to replace every non-0 number with the number in that place added to another number - no loops
I think it is neater to only define the index once: >> X = A~=0; >> A(X) = A(X)+B A = -6 0 -4 -3 -2 0 1 0 ...

6 días ago | 0

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