Stephen23

Active since 2014

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How to find out number of Fridays in a month?
Here is a really simple approach using CALENDAR(): M = calendar(2022,8); N = nnz(M(:,6)) Otherwise you could try using a DATE...

ungefär 11 timmar ago | 0

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How do I copy some files to another folder?
"I guess the filename cannot be a string..." The filenames certainly can be string. The problem is the you are using command s...

ungefär 13 timmar ago | 0

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How to delete a duplicate cells?
F = {[3,8;6,4],[6,9;7,3],[3,8;6,4],[6,9;7,3]}; F{:} for ii = numel(F):-1:2 for jj = 1:ii-1 if isequal(F{ii},F{jj...

ungefär 18 timmar ago | 1

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Split string in two strings
str = ["van Donk","Gerritsen","kooijman","Verliefde","Floré","Pengel","aan de Wiel","van der Hoeven","Hop","Boer","van Ewijk"] ...

en dag ago | 1

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Split column by text and numbers
str = ["54","33","104A"]; tkn = regexp(str,'^(\d+)\s*(\w*)$','tokens','once'); tkn = vertcat(tkn{:}); num = tkn(:,1) let = t...

en dag ago | 0

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Answered
Store cell arrays composed of datetimes and numbers
Your loop works for me (with suitable preallocation): store = cell(5,2); % preallocate! for i = 1:5 dt = datetime(2022,ra...

en dag ago | 0

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Unable to use inner join function
Because the two tables use different names for the key variable, you will have to help INNERJOIN by telling it the names of the ...

2 dagar ago | 0

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Answered
how to write numbers with 10^ format in matlab?
str = strrep(sprintf('CC = %.1e',123456),'e','x10^') str = regexprep(sprintf('CC = %.1e',123456),'e(\D)0*(\d+)$','x10^$1$2')

2 dagar ago | 0

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Answered
How would I convert years to date time?
N = 2022.1765918316; D = datetime(fix(N),1,1) + calyears([0;1]); T = D(1) + diff(D)*mod(N,1)

2 dagar ago | 0

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Answered
how to extract some data from this particular structure?
"Any ideas?" Two comma-separated lists will do it. For example, where C is your cell array: S = [C{:}]; % create non-scalar st...

2 dagar ago | 0

Answered
How removing elements from vector?
c = [1,2,3] z = [10,9,1,4,11,2,6,3] x = setdiff(z,c,'stable') or z(ismember(z,c)) = []

2 dagar ago | 0

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Answered
Create a cell with row vectors as elements
F = @(varargin) vertcat(varargin{:}); C = arrayfun(F, A,B,C,D,E,F,G,H,I,J, 'uni',0);

3 dagar ago | 0

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How do I insert a 1x1 cell array consisting of one vector into a table?
So far no one adressed your questions, nor explained the cause of your problem: the problem comes from the fact that you are usi...

9 dagar ago | 0

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How to concatenate multiple .mat files and generate a 3D matrix?
"I have 100 files ..." which are probably named using some sequential numbering, so you will need to take that into account in ...

9 dagar ago | 0

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Can you parameterize table lookup, i.e. t1.A(i) = t2.A(t2.B==t1.B(i)), so it does not require a loop?
If you stored the IDs as basic numeric arrays, rather than inefficiently as complex cell arrays containing lots of numeric scala...

10 dagar ago | 0

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Answered
Using structures with Functions
Rather than defining a scalar structure containing arrays, it looks like you should be using a non-scalar structure: https://ww...

10 dagar ago | 2

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Answered
Sort files in folder based on type
mkdir('ecfFiles') mkdir('txtFiles') movefile('*.ecf','ecfFiles') movefile('*.txt','txtFiles')

11 dagar ago | 0

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How to interpolation between matrices
Assuming that you want to interpolate between the corresponding elements of those 4x4 matrices, then you could do something like...

13 dagar ago | 0

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How to map one array elements to another array elements?
Method one: indexing: num = [1,2,2,4,3,1]; val = [40,30,20,10]; out = val(num) Method two: interpolation: out = interp1(val...

13 dagar ago | 0

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Answered
Choosing a function handle from a group of function handles
s = sprintf('f_%d_%d',m,n); f = str2func(s);

14 dagar ago | 0

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Using contains() with dir() to search files in folder
Replace this comma-separated list files_in_folder.name with this cell array of filenames: {files_in_folder.name} https://www...

14 dagar ago | 1

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Logical array indexing unexpected behaviour.
"I have been unable to find anything about this behavior so please enlighten me" https://www.mathworks.com/help/matlab/matlab_p...

15 dagar ago | 0

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How to use Greek Letters in equation
The MATLAB approach: syms omega mu epsilon sigma k1 = omega .* sqrt((mu .* epsilon)/(2)) .* sqrt((1 + ((sigma)/(epsilon .* ome...

17 dagar ago | 0

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Answered
How can I change a matrix name in workspace during my script ?
The problem is caused by your data design, which forces meta-data into variable names. Forcing meta-data into variable names mak...

21 dagar ago | 1

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n E Z => sin(n*pi) = -1 ?
n = sym(100000000000000000000000000000) sin(n*pi)

22 dagar ago | 1

Answered
Sort values in a cell array
A = [90,45,38,51]; B = [8,1,8,3]; [~,~,X] = unique(B); C = accumarray(X,A(:),[],@(v){v}) Checking the content of C: C{:}

22 dagar ago | 1

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Answered
How to get coordinates of largest element in an array?
format long G M = [-2.37702213697260e+17,-2.33711662054550e+19,-615937600693473,-4.41919914907522e+19,-3.50291921355524e+20;-2....

22 dagar ago | 0

Answered
Warnings in Command Window
"I'm not if that's causing the problem." The problem is that you have added many subfolders to the MATLAB search path, that sho...

22 dagar ago | 2

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How do I sort all the columns of a table based on the first column?
Where T is your table: T = sortrows(T,'Date')

22 dagar ago | 1

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Reading numbers from String
Another approach: str = {'SRm40_','SRp5_'}; vec = str2double(regexprep(str,{'[A-Z_]+','m','p'},{'','-','+'}))

23 dagar ago | 0

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