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Stephen


Active since 2014

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Answered
Problem with datetime in German
There does seem to be a problem with DATETIME handling the period characters (below). Workaround: replace/remove the period cha...

6 hours ago | 0

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Answered
Storing many digits using readtable
Any advice that "you are going to need to read the file as text" is incorrect. It is much better to import and store numeric da...

6 hours ago | 0

Answered
How to see if characters are present in a string array.
Assuming that all string elements contain exactly the same number of characters, then you can do this easily with basci logical ...

11 hours ago | 0

Answered
Subtracting Matrices in Special way
If the A values are copied first then only two ISMEMBER are required (simpler, more efficient), nor any resizing or changing of ...

1 day ago | 1

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

3 days ago | 0

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Answered
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}; % ...

3 days ago | 0

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Answered
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...

3 days ago | 0

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Answered
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(:),...

7 days ago | 2

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Answered
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,...

8 days ago | 1

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

8 days ago | 0

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Answered
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','...

8 days ago | 0

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Answered
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...

8 days ago | 0

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Answered
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...

8 days ago | 1

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Answered
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...

8 days ago | 0

Answered
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...

8 days ago | 1

Answered
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...

8 days ago | 0

Answered
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...

9 days ago | 1

Answered
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 ...

9 days ago | 0

Answered
@ 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...

9 days ago | 0

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Answered
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$'...

9 days ago | 1

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Answered
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

9 days ago | 0

Answered
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)

10 days ago | 0

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

11 days ago | 0

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Answered
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...

11 days ago | 0

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Answered
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 ...

12 days ago | 0

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

14 days ago | 0

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Answered
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...

14 days ago | 0

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Answered
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...

15 days ago | 0

Answered
I am getting a Error using alpha (line 68) Wrong number of arguments and was wondering if anyone could help me out because i am not sure what its saying.
% alpha in degree <<<<<< This needs to be a comment, not code. range=0:15:360; Y=sind(range); Table=[range;Y]'; disp('HW #6 ...

15 days ago | 0

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