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Stephen Cobeldick


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6 966 total contributions since 2014

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Answered
How to generate a random decimal number between -1 and 1?
The inputs to rand define its output size, not the output value range. Its range is fixed to 0..1, but you can adjust generate o...

environ 15 heures ago | 0

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Answered
coverting string to ascii value in Matlab
"the letter 'a' is 61 why in matlab i get NAN?" Because that is the wrong way to get the ASCII value (or character code, to be ...

1 jour ago | 0

Answered
Operator '==' is not supported for operands of type 'cell'.
Use strcmpi instead of testing for character equality.

2 jours ago | 1

Answered
Sorting Vector A in Ascending order and apply the same steps to Vector B
[A,X] = sort(A) B = B(X)

2 jours ago | 0

Answered
Subtracting 2 cells in an array
>> -diff(A) ans = -2 -2 3 -4 5 >> sum(-diff(A)) ans = 0

2 jours ago | 0

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Answered
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...

3 jours ago | 0

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Answered
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...

3 jours ago | 0

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Answered
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(' %...

3 jours ago | 0

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Answered
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 ...

3 jours ago | 0

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

3 jours ago | 0

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Answered
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...

3 jours ago | 0

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

3 jours ago | 0

Answered
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;

3 jours ago | 0

Answered
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...

3 jours ago | 0

Answered
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...

3 jours ago | 1

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Answered
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 ...

4 jours ago | 0

Answered
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. ...

4 jours ago | 0

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Answered
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); ...

4 jours ago | 0

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Answered
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 ...

4 jours ago | 0

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Answered
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...

4 jours ago | 1

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Answered
find text in text file
>> T = readtable('temp0.txt','Delimiter','\t','ReadVariableNames',false) T = Var1 Var2 Var3 __________ ...

4 jours ago | 0

Answered
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...

4 jours ago | 0

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Answered
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...

4 jours ago | 0

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Answered
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(:))]

5 jours ago | 0

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Answered
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)) ...

5 jours ago | 0

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

5 jours ago | 0

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Answered
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...

5 jours ago | 0

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

7 jours ago | 1

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Answered
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...

7 jours ago | 1

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Answered
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...

7 jours ago | 0

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