Stephen23

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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...

約13時間前 | 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...

約16時間前 | 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...

約20時間前 | 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"] ...

1日前 | 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日前 | 0

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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日前 | 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日前 | 0

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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日前 | 0

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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日前 | 0

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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日前 | 0

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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日前 | 0

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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日前 | 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日前 | 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日前 | 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日前 | 0

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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...

11日前 | 2

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

11日前 | 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日前 | 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日前 | 0

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

14日前 | 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日前 | 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日前 | 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日前 | 0

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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日前 | 1

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

22日前 | 1

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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日前 | 1

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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日前 | 0

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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日前 | 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日前 | 1

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

23日前 | 0

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