Community Profile # Stephen Cobeldick

Last seen: Today Active since 2014

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Help with regexp to extract data
tdata = {'W1W','W1W 7','W1W 8','AZ_85262','CA_90032','CA_90045'}; tkn = regexp(tdata,'^(.*?)_?([^_]*)\$','tokens','once'); tkn ...

ungefär 14 timmar ago | 0

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complicated formatted text with textscan
I removed the extra line of numbers from block 3, the modified data file is attached. This code imports the modified data file:...

ungefär 18 timmar ago | 0

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How to cut multiple file ans past it to folder?

ungefär 18 timmar ago | 0

Using cell array for indexing
No need for a loop, here is the simple and efficient MATLAB approach: IndArray = {i1,..,im}; IndArray(1+end:ndims(A)) = {':'};...

en dag ago | 1

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),...

3 dagar ago | 0

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Submitted

Numeric to Ordinal-String
Convert numeric values to a string array of integers with ordinal suffixes. Fully vectorized! 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...

5 dagar ago | 0

'123' to 123
A = '123' A = str2double(A)

5 dagar ago | 0

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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 ...

7 dagar 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...

7 dagar ago | 0

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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...

7 dagar 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...

7 dagar 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...

7 dagar 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)

7 dagar 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) ...

7 dagar 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: ...

13 dagar ago | 0

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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])

13 dagar ago | 0

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This PDF file: https://www.mathworks.com/help/pdf_doc/matlab/matlab_apiref.pdf is listed here: https://www.mathworks.com/help...

13 dagar ago | 0

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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...

14 dagar ago | 0

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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'...

15 dagar ago | 0

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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...

16 dagar ago | 0

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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...

19 dagar ago | 1

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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...

19 dagar ago | 2

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Convert values in the cell to array using cell2mat
The robust approach: out = horzcat(output1{:})

19 dagar ago | 0

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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...

19 dagar 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. ...

20 dagar ago | 1

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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...

20 dagar ago | 0

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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; ... ...

20 dagar ago | 0