Community Profile # Stephen

Active since 2014

Suspensa Vix Via Fit

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How do I get values of a certain parameter in a multi-dimensional matrix?
a(~Ind) = NaN

1 day ago | 0

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Display file names from current directory if more than n characters
n = 5; P = 'absolute or relative path to where the files are saved'; S = dir(fullfile(P,'*.*')); C = {S(~[S.isdir]).name}; % ...

1 day ago | 0

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Comparision double values 135 with 135.0000
" A comparision with a simple if-statement and the == operator does not succeed." Yes, it does succeed: their values are differ...

1 day ago | 0

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Submitted

Customizable Natural-Order Sort
Alphanumeric sort of a cell/string/categorical array, with customizable number format. Submitted

Natural-Order Filename Sort
Alphanumeric sort of filenames or filepaths, with customizable number format. Submitted

Natural-Order Row Sort
Alphanumeric row sort of a cell/string/categorical/table array, with customizable number format. Is it possible to fprintf/sprintf each row of elements in a vector using loop?
I would not use a loop: N = ["Earth"; "Venus"; "Mars"]; V = ["1.0000"; "0.8975"; "0.3915"]; fprintf('%s %s Gravity\n', [V(:),...

5 days ago | 2

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How can I import a file.txt and extract data?
opt = {'CollectOutput',true}; [fid,msg] = fopen('prova2.txt'); assert(fid>=3,'%s',msg) hdr = fgetl(fid); out = textscan(fid,...

6 days ago | 1

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Find values that are greater than a specific number in a table
nnz(Lake>=20)

6 days ago | 0

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Directly perform a multiplication on certain variables in a table
T = cell2table({'a',1,2;'b',3,4;'a',5,6},'VariableNames',{'x','y','z'}) idx = strcmp(T.x,'b'); T{idx,{'y','z'}} = T{idx,{'y','...

6 days ago | 0

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Recording vectors in for loop, when the loop is running in a range starting with negative numbers
Data are not indices, do not mix them up. V = -nmax:1:nmax; % data!!!! for k = 1:numel(V) % indices!!!!! n = V(k); % data...

6 days ago | 0

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How can I ask Matlab to adjust a parameter in an equation until the answer becomes equal with a predetermined input value?
Use FZERO: https://www.mathworks.com/help/matlab/ref/fzero.html Define a simple anonymous function with one input which calcula...

6 days ago | 1

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Conditions else if - efficiency advice
inp = '003'; % S group subS = {'001','002','003'}; aS = {'R','O','O'}; % T group subT = {'01','02','03'}; aT = {'O','O','R...

6 days ago | 0

Calculate this matrix in a more general and shorter way
x = rand(100,1); w = pi; m = (1:5).*w.*x; m = [ones(100,1),reshape([cos(m);sin(m)],100,[])]; for comparison: P = [ones(size...

6 days ago | 1

Undefined variable in workspace problem
"where measurementValue is an n x 1 double array already loaded in my workspace." I guess you mean that it is loaded into the b...

6 days ago | 0

How to call a value from the command window to the editor window
Ugh, P-Files. You could try using EVALC: https://www.mathworks.com/help/matlab/ref/evalc.html and then parsing the string that...

7 days ago | 1

Getting error that output argument is not assigned during function when it is?
When direc is empty then ccmp is not defined (exactly as the error message states). This error is easy to demonstrate (showing ...

7 days ago | 0

@ Symbol in function handles as an input variable to another function
"if i were to remove the @ sign it would tell me that i am missing input arguments..." Because in that case you are just callin...

7 days ago | 0

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strcmp function using wildcards
T = cell2table({'A','XXX';'B','G22';'C','G13';'D','G1234';'E','YYY';'F','G01'}) idx = ~cellfun(@isempty,regexp(T.Var2,'^G\d\d\$'...

7 days ago | 1

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How to read hh:mm:ss.sss time format from a file that has time and other data
Because you did not upload a sample file I had to create my own (attached). T = readtable('test.txt') T.Var1

7 days ago | 0

Find the different elements in a cell array
Where out is your cell array: fnh = @(v) any(v(:)==1)&&any(v(:)==2); idx = cellfun(fnh,out)

8 days ago | 0

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includeSubFolders name value pair argument
imageDatastore(imdir, "IncludeSubfolders",true, "LabelSource","foldernames"); % ^^^^ yo...

9 days ago | 0

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when using intersect function i need all rows of B and matching rows of A. how can i do it?
T1 = array2table([2451,10;2554,5;5419,2],'VariableNames',{'A','id'}) T2 = array2table([2451,15;2554,7;5419,5;8542,9],'VariableN...

9 days ago | 0

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Subtracting in a structure
You can do all of them at once using some comma-separated lists: S(1).F = 6; S(2).F = 10; S(3).F = 12; S(4).F = 16; S(5).F ...

10 days ago | 0

Index table with cell array
Where T is your table and C is your cell array: idx = ismember(T.NameOfVariable, C) out = T(idx,:)

12 days ago | 0

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Paste array a into array c based on the locations in array b
This is robust also when there is no overlap: a = [1,2,3,4,5,6]; b = [1,5,8,14,19,23]; d = diff(b); d(end) = d(end)+1; % inc...

13 days ago | 0

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How to exclude specific results from dir
C = {'A1b1';'A1b2';'A1b1_test'}; cellfun(@mkdir,C) S = dir('./*'); S.name S(ismember({S.name},{'.','..'})) = []; S(endsWith...

13 days ago | 0