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...

ongeveer een uur 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...

ongeveer 4 uur 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...

ongeveer 8 uur ago | 1

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

1 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...

1 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...

1 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 ...

1 dag 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')

1 dag 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 dagen 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 dagen 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 dagen 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 dagen ago | 0

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Answered
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...

8 dagen 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 dagen 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...

9 dagen 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 dagen ago | 2

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

10 dagen ago | 0

Answered
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 dagen ago | 0

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Answered
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 dagen 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);

13 dagen 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...

13 dagen 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...

14 dagen ago | 0

Answered
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...

16 dagen 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...

20 dagen ago | 1

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

21 dagen 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{:}

21 dagen 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 dagen 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 dagen 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 dagen ago | 1

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

22 dagen ago | 0

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