Stephen Cobeldick
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Content Feed
How to organize an array (x_i,y_j,z) such that (x_i,y_i)=z?
The trick is to use https://www.mathworks.com/help/matlab/ref/sub2ind.html A = [1,1,2;1,2,0.5;2,1,0.5;2,2,1] S = max(A(:,1:2),...
15 hours ago | 0
| accepted
Submitted
Numeric to Ordinal-String
Convert numeric values to a string array of integers with ordinal suffixes. Fully vectorized!
1 day ago | 7 downloads |
why "writetable" replaces points with commas ???
"why "writetable" replaces points with commas ???" It doesn't. The Open Office XML format (e.g. XLSX) uses only the decimal po...
3 days ago | 0
Indexing a variable in a cell array?
strcmpi(txt2,date) But... you should be using READTABLE to import that file data, and handle those dates as DATETIME, not as ...
4 days ago | 0
Add variables calculated in a for loop into an array
I suspect that you need something like this: nml = numel(numbers); out = nan(nml,1); for k = 1:nml out(k) = calculate(nu...
4 days ago | 0
| accepted
How can I change the line color in a graph using plot
You are using MATLAB R2014a, which uses the old graphics system. That YouTube tutorial uses R2015b, which includes a totally ne...
4 days ago | 0
Why is x(:) so much slower than reshape(x,N,1) with complex arrays?
I hypothesize (without much proof) that colon (aka indexing) simply does a lot more under the hood. We can assume that it calls...
4 days ago | 0
Get number of fields? the result should be 14! I tried with size but it did not work!
"I tried with size but it did not work!" The size of a structure is completely independent of how many fields it has. To count...
4 days ago | 0
Select particular elements from a cell array to form a matrix (double type)
Simply: fun = @(x) x.endo_simul(17,1); out = cellfun(fun,results)
5 days ago | 1
What is the most correct way of determining whether variable contains a number
Let MATLAB do the heavy lifting for you: fun = @(x) isnumeric(x)&&isfinite(x) || isfinite(str2double(x)); fun(2.3) fun(NaN) ...
5 days ago | 0
How to create exportable table from outputs of function iterated using for loop?
If your function has four outputs then you need to call it with four outputs. This is explained in the introductory tutorials: ...
11 days ago | 0
| accepted
How to reshape 3D matrix ?
A = randi(9,4,4,3) B = permute(reshape(permute(A,[2,1,3]),[2,8,3]),[3,1,2])
11 days ago | 0
| accepted
Where can I download apiref.pdf
This PDF file: https://www.mathworks.com/help/pdf_doc/matlab/matlab_apiref.pdf is listed here: https://www.mathworks.com/help...
11 days ago | 0
| accepted
Why is my loop not working?
Look closely at the variable a: a=0; for .. a=a+50; [b,a]=ellip(..[a 5000]..); .. end At the start of the fir...
11 days ago | 0
| accepted
Merge a row to a single cell
C = {... '1' '2' ':' '5' '7' ':' '0' '0' '1' '2' ':' '5' '7' ':' '0' '0' '1' '2' ':' '5' '7' ':' '0' '0' '1'...
12 days ago | 0
| accepted
The size of the indicated variable or array appears to be changing with each loop iteration. Commonly, this message appears because an array is growing by assignment or concat
h = 1; r = 0:h:20; z = 0:h:20; [rgrid,zgrid] = meshgrid(r,z); zgrid = flip(zgrid) Simpler, faster code: b2 = find(zgri...
13 days ago | 0
| accepted
What does this mean "No differences to display. The files are not identical, but the only differences are in end-of-line characters."
"Can anyone help me to understand the meaning? " When you look at those files then they are shown with lots of lines. You might...
16 days ago | 1
| accepted
How to include 'end' in a varibable to extract a subset of the original vector ?
"... if i want to define range before the definictiion of the vector..." You could use an anonymous function: rng = @(v)v(1:en...
16 days ago | 2
| accepted
Convert values in the cell to array using cell2mat
The robust approach: out = horzcat(output1{:})
17 days ago | 0
| accepted
How to store matrices in a cell from a loop?
Rather than lots of separate variables, use a comma-separated list to store the function outputs: https://www.mathworks.com/hel...
17 days ago | 0
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Function output produces double array while only a single value is expected
I would avoid all of those superfluous and inefficient type conversions and messing around with indexing into character arrays. ...
17 days ago | 1
| accepted
Read set of .dat files in for loop
https://www.mathworks.com/help/matlab/import_export/process-a-sequence-of-files.html P = 'absolute or relative path to where th...
17 days ago | 0
| accepted
How to count alternating ones and zeros in a matrix
v =[ 0 0 0 0 0 0; ... 1 1 0 1 1 0; ... 1 0 1 0 1 0; ... ...
18 days ago | 0
Round the elements column of the matrix to the same digit than it is in the other column
S = 2; A = 32*rand(5,7)-13 round(A(:,5),S,'significant') % for comparison P = S-1-floor(log10(abs(A(:,5)))); B = round(A.*10...
18 days ago | 0
how to combine datetime array with cell array for export?
T = table(A,B); writetable(T,...)
18 days ago | 1
| accepted
Submitted
Customizable Natural-Order Sort
Alphanumeric sort of a cell/string/categorical array, with customizable numeric format.
18 days ago | 45 downloads |
Submitted
Natural-Order Filename Sort
Alphanumeric sort of filenames or filepaths, with customizable numeric format.
18 days ago | 350 downloads |
Submitted
Natural-Order Row Sort
Alphanumeric row sort of a cell/string/categorical array, with customizable numeric format.
18 days ago | 19 downloads |
How to use "if statement" for different matrix?
The MATLAB approach is to use arrays and indexing, e.g. using one simple cell array: V = {[1,3,5;2,4,7];[1,2,5;2,4,6];[1,4,5;4,...
18 days ago | 0
