Stephen23

Aktiv seit 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...

ein Tag vor | 0

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Beantwortet
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...

4 Tage vor | 0

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Beantwortet
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)

5 Tage vor | 0

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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...

5 Tage vor | 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...

7 Tage vor | 0

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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 ...

9 Tage vor | 0

Gesendet

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

9 Tage vor | 34 Downloads |

Beantwortet
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...

9 Tage vor | 0

Beantwortet
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);...

12 Tage vor | 0

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Beantwortet
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))

12 Tage vor | 0

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Beantwortet
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...

12 Tage vor | 0

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Beantwortet
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)

13 Tage vor | 0

Beantwortet
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...

15 Tage vor | 1

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Beantwortet
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...

15 Tage vor | 1

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Beantwortet
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...

15 Tage vor | 1

Beantwortet
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/...

17 Tage vor | 1

Beantwortet
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 ...

19 Tage vor | 0

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Beantwortet
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...

22 Tage vor | 1

Beantwortet
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]),[...

23 Tage vor | 2

Beantwortet
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...

24 Tage vor | 1

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Beantwortet
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...

24 Tage vor | 0

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Beantwortet
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...

24 Tage vor | 1

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Beantwortet
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...

24 Tage vor | 0

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Beantwortet
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; ...

25 Tage vor | 1

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Beantwortet
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...

25 Tage vor | 1

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Beantwortet
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...

28 Tage vor | 1

Beantwortet
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...

29 Tage vor | 0

Beantwortet
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...

etwa ein Monat vor | 1

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

etwa ein Monat vor | 1

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Beantwortet
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...

etwa ein Monat vor | 0

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