Answered
Find column number for every row in matrix
M = [-1,4,1;1,-1,-1;-5,4,-1] Method one: logical array, CUMSUM, and FIND: X = M>=0; Y = X&cumsum(X,2)==1; [C,~] = find(Y.') ...

10 days ago | 0

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Answered
Creating a function to Import data into structures
[TrajX.(trialname),TrajY.(trialname),TrajZ.(trialname)] = Import_Data_Function(vicon,subject,firstframe,lastframe); function ...

10 days ago | 0

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Answered
Vertically Concatenating Timetables of Different Sizes
"The goal here is to vertically concatenate each timetable so that all the data within the intersection are aligned by column/di...

11 days ago | 0

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Answered
is there any way to convert milliseconds to hh:mm:ss.FFF.
N = uint32(65432) D = milliseconds(N); D.Format = 'hh:mm:ss.SSS'

11 days ago | 1

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Working with structures : Unrecognized field name
"Do you have any ideas on how to get around this problem? " Field = fieldnames(s); Dat = s.(Field{1}).data https://www.mathwo...

11 days ago | 0

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Answered
how to reverse a matrix (nxm) sorting?
x = rand(3,5) [xs, is] = sort(x,2) Method one: NDGRID and SUB2IND: sz = size(x); [~,ic] = sort(is,2); [ir,~] = ndgrid(1:sz(...

12 days ago | 1

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Answered
How to convert time format of file date
"Hello, I want to convert the date string obtained by file.date to the format yyyymmdd_HHMMSS, i.e.," A much simpler and much m...

12 days ago | 0

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Answered
subdirectories in a for loop
P = 'F:/PhD/Swan pruebas/Iniciados/regreso/River/MorF Rs (Veg)'; S = dir(fullfile(P,'Output*','file.mat')); S = natsortfiles(S...

14 days ago | 0

Answered
Average product of arrays
T = readtable('pems_rawdata_NB.csv') F = @(c)cellfun(@(t) sscanf(strrep(t,'{',''),'%f,'), c,'uni',0); T = convertvars(T,{'flow...

14 days ago | 1

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Answered
Reading data from .txt files from a folder.
To make debugging unexpected data (sizes, types, values) easier, I usually find it easier to concatenate data after the loop: P...

15 days ago | 0

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Answered
Vectorising nested for loops
S = load('data.mat') list = S.list tdat = S.table_data k=0; out0 = struct('idx',[],'count',[],'size',[]); for i = 1:size(...

15 days ago | 1

Answered
Matlab not recognizing 'fit' function
Have you or any third-party function or toolbox made any changes to the MATLAB search path? Call https://www.mathworks.com/help...

15 days ago | 1

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Answered
Remove null rows from a structure before converting to table
S = struct('A',{[],[],1},'B',{[],[],2}) X = arrayfun(@(s)any(structfun(@isempty,s)),S); T = struct2table(S(~X))

15 days ago | 0

Answered
readmatrix ignores the first line of the data file
You can specify the RANGE as the starting row: M = readmatrix('sample.txt', 'ConsecutiveDelimitersRule','join', 'Range',1) I n...

16 days ago | 1

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Answered
Sort two array in the same way, but only one in size order
"The problem now is that I want the same rows that changed for x should be changed for y. " It is not a problem, because when y...

17 days ago | 1

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Answered
Sorting vectors into a 3-D grid efficently
Perhaps something like this. The elements of M need to be valid indices, which you can achieve using basic arithmetic operations...

18 days ago | 1

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Rewriting a file?
https://www.mathworks.com/help/matlab/ref/writelines.html Tip for the future: you are already using READLINES, so scroll right ...

18 days ago | 0

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How can I separate individual years from a timetable?
S = load('DateStamp.mat') T = S.DateStamp [G,Y] = findgroups(T.date.Year); X = arrayfun(@(x)find(x==G), 1:max(G), 'uni',0); ...

19 days ago | 1

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Answered
Understanding about stacking in MATLAB
"My query is what does the term stacking indicates..." MATLAB does not use the term "stacking" to refer to these kinds of opera...

19 days ago | 0

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Answered
How to rearrange a row vector into a pair wise column vector?
"I am sure there is a nice loop to do this, but I can't find a solution." This is MATLAB, so loops are not required: v = 1:21 ...

19 days ago | 0

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Answered
MATLAB poems -- let's hear 'em!
In MATLAB we write lines of code For solving problems, it's our abode With matrices and arrays We handle huge data trays And...

19 days ago | 0

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Replace specific elements in strings
Here are two approaches: A = ["America (New York)"; "America (Manhattan)"; "Italy (Rome)"] B = strrep(strrep(A,' (',' - '),')'...

20 days ago | 0

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Behavior with unspecified output arguments
"Has it always been this way?" Yes. Several MATLAB functions from waaaay back in the past use exactly this feature. For exampl...

22 days ago | 1

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How can I get the return of a constructed function as an array?
That is not how MATLAB works. Your code defines a matrix of zeros, but then you do nothing with that variable and simply replace...

23 days ago | 0

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Vectors of seeming identical length, are supposedly not equal in length, how to fix?
Read the FITGAUSS documentation: https://www.mathworks.com/matlabcentral/fileexchange/7489-fitgauss The order of your input ar...

23 days ago | 0

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Answered
Creating an augmented matrix a set of matrices
A = cat(3,[1,3;0,1],[1,1;1,1],[0,0;0,0]); C = num2cell(A,1:2); X = 1+tril(toeplitz(1:numel(C))); C = [{zeros(2)};C(:)]; M = ...

23 days ago | 0

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Answered
find the closest datetime
I have a datetime column with the format HH:mm:ss.SSSS and for which I'm loooking for the closest datapoint to a time in a forma...

23 days ago | 0

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Answered
How to list all tasks in a table and sum up total time spend on each?
You can do this in just a few lines of code. Don't fight MATLAB with multiple nested loops! The data would be so much easier to...

24 days ago | 1

Answered
How to put value from one matrix into another matrix
A = [3:42;rand(1,40)].' B = [6,45,18,24,33;5,12,17,23,32;4,11,16,22,31;3,10,15,21,30] R = nan(size(B)); [X,Y] = ismember(B,A(...

24 days ago | 0

Answered
How to find the order of the power of A matrix?
A = [1,0,1;1,1,0;1,0,0]; B = A; for n = 2:5 B = mod(B*A,2); if isequal(B,eye(3)) break end end n B

25 days ago | 1