Stephen23

Active since 2014

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How should I fix my regular expression to parse this txt file?
"It seems that my regular expression is way too broad and causing this problem." There are several locations where your regular...

11 hours ago | 0

Answered
What is the equivalent datetime() call to the clock() function?
Note that DATETIME is an object with properties, so (depending on your requirements) accessing its properties is a simple option...

3 days ago | 0

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Answered
How can I convert matrix to cell?
https://www.mathworks.com/help/matlab/ref/mat2cell.html A = reshape(1:40000,100,400)'; C = mat2cell(A,4*ones(1,100),100)

3 days ago | 0

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Answered
How to name and save the results using the name of imported file ?
A much better approach is to store the data in e.g. a structure array: P = 'absolute or relative path to where the files are sa...

4 days ago | 0

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Question on creating dynamic matrix variables
"Or alternatively, is there a neat way to do so?" Of course there is: indexing. Either into a numeric array or into a container...

6 days ago | 0

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Answered
Building an array of strings that might be empty
"What am I missing?" The differences between strings and characters. Do not mix up string arrays with character vectors (which ...

8 days ago | 0

Submitted

Maximally Distinct Color Generator
Generate maximally-distinct colors in an RGB colormap.

8 days ago | 35 downloads |

Answered
Find a value using an index obtained from a different matrix with same dimensions
The efficient MATLAB approach: tmc = readmatrix('Total_matrix_cases.txt'); tmr = readmatrix('Total_matrix_rotation.txt'); [tm...

8 days ago | 0

Answered
Using a menu to generate variables for larger code
For the 1st dialog box: V = str2double(answer); maxvel = V(1); dragco = V(2); width = V(3); mass = V(4); accdur = V(5);...

10 days ago | 0

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Answered
3D indices for particular values in a 3D array
Use IND2SUB: X = randi(9,4,3,2) [R,C,P] = ind2sub(size(X),find(X==8))

11 days ago | 0

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Answered
how assign cellarray to field Struct
"thank..but it's possible to avoid loop?" Of course (depending on the sizes and classes of APP, SIS, etc): app.Sis = struct('b...

11 days ago | 0

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Answered
Generate Array of Random Values
D = sort(randi([-9,9],7,2),2) V = rand(7,13); V = V.*diff(D,1,2)+D(:,1)

12 days ago | 0

Answered
Hi, I want to speed up my script with double loop.
X = permute(A,[3,2,1]) + permute(B,[2,3,1]) The data arrangement in memory is not optimal for that operation. Use BSXFUN for ve...

13 days ago | 1

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Answered
How to replace exact char in a cell array from another reference cell array
This is difficult because 'x1' is also a substring of 'x10'. But making a few assumptions it might be possible: A = {'x1', 'x10...

13 days ago | 1

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Answered
Merge two matrices taking non-Null values
A = [8,8,8,8,NaN;32,32,25,31,NaN;56,56,43,53,NaN;81,80,60,76,NaN;105,103,78,99,NaN;129,127,95,122,NaN]; B = [8,NaN,8,8,8;32,NaN...

14 days ago | 1

Answered
Dynamically Make a Variable Name
This is MATLAB so the best solution is to use indexing, just as the MATLAB documentation shows: https://www.mathworks.com/help/...

16 days ago | 1

Answered
How to call a function name from function names saved in an array?
prev_output = [1,0,0]; fcs = sprintf('func%s',sprintf('%d', prev_output)); Either use FEVAL: output = feval(fcs,inputs); or ...

18 days ago | 0

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Answered
How to use Unicode numeric values in regexprep?
inp = 'Häagen-Dasz'; baz = @(v)char(v(1)); % only need the first decomposed character. out = arrayfun(@(c)baz(py.unicodedata.n...

21 days ago | 1

Answered
Cutting (dividing) a matrix into a specific number of rows.
A = [11,12,13;21,22,23;31,32,33;41,42,43;51,52,53;61,62,63;71,72,73;81,82,83]; B = reshape(permute(reshape(A,[],2,3),[1,3,2]),[...

22 days ago | 2

Answered
Why does MATLAB not finding a element from my matrix?
Testing for exact equivalence of binary floating point numbers should be avoided. Compare the values, are they actually the sam...

23 days ago | 1

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Answered
Question: Structure Array Generation and Dimensions Manipulation
Simple solution: new = [newpop(:);pop(:)] However if you want to your code to be more robust, then you need to preallocate NEW...

23 days ago | 0

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Answered
Printing all outputs of the function that has been solved via ode45
This questions gets asked regularly on this forum: users often imagine that there must be some easy way to get some values out o...

23 days ago | 1

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Answered
Index exceeds the number of array elements error when using fsolve
Your x0 is a two-element vector, so you told FSOLVE to call the function handle with a two-element vector. But then inside the f...

23 days ago | 0

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Answered
How do I plot a tent-map?
"How do I plot a tent-map?" Following the basic definition of tent map: https://en.wikipedia.org/wiki/Tent_map X = 0:0.01:1; ...

24 days ago | 1

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Answered
Impossible to set VariableTypes as 'double' for complete array and readtable function
Try something simpler and let READTABLE do the work for you: T = readtable('test_log_1.csv', 'CommentStyle','#', 'VariableNamin...

24 days ago | 1

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Answered
Replacing numerical values in table with string
This is MATLAB, so forget about using a loop like that. Either replace the entire column at once or use e.g.: https://www.mathw...

27 days ago | 1

Answered
Sorting files in struct according to time in filename
You could download my FEX submission NATSORTFILES(): https://www.mathworks.com/matlabcentral/fileexchange/47434-natural-order-f...

28 days ago | 0

Answered
How to extract data from a file, and form a column vector?
Note that copy-and-pasting blocks of code like that... is not a generalized approach to writing code. Best avoided. Rather than...

1 month ago | 1

Answered
Generate list of frequencies evenly spaced in logarithmic plot
X = logspace(log10(0.2),log10(628),8) Y = sqrt(X); semilogx(X,Y,'-*')

1 month ago | 1

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Answered
Extracting a double array from within a struct
"So in the end I will have an 18x297 array." Because there are a different number of columns in each matrix you will need to EI...

1 month ago | 0

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