Answered
Extract value until regexp case match
Does the data you want to match always occur at the start of the string? A = "9/12/2022 7:38:51 PM 216 Indicator"; B = regexp(...

3 years ago | 1

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Answered
Sine Function I'm trying to Plot won't show up
"Not sure what I'm doing wrong here." You need to use element-wise division, not matrix division: phi = 0:0.1:6*pi; I2 = sin(...

3 years ago | 1

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Answered
replacing text in a string using indexing
For overlapping matches use STRREP. For non-overlapping matches use REGEXPREP: regexprep('qqqqqq','qqq','qwe') regexprep('qqq...

3 years ago | 0

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How can I discretize data by their sign?
A = [-2,-1,5,-10,7,3,-9,-12,11]; B = sign(A); C = cumsum(logical([1,diff(B)]))

3 years ago | 0

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Answered
Skipping certain lines using fscanf
C = {}; [fid,msg] = fopen('polydata.txt','rt'); assert(fid>=3,'%s',msg) while ~feof(fid) C{end+1} = sscanf(fgetl(fid),'%...

3 years ago | 0

Answered
Creating Own Time Variable from Datetime Data
"I hope someone can help me convert my datetime time variable into working with a new time variable, thanks. " Your question do...

3 years ago | 0

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Answered
How inv() works ?
The INV documentation states "inv performs an LU decomposition of the input matrix (or an LDL decomposition if the input matrix ...

3 years ago | 1

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Convert matrix into CSV, with each matrix element as a separate line including indices of matrix element
M = [0.5,0.1,0.6;0.9,0.8,0.3] N = M.'; S = size(N); [X,Y] = ndgrid(1:S(1),1:S(2)); writematrix([X(:),Y(:),N(:)],'test.txt') ...

3 years ago | 1

Answered
Why does the code have Check for incorrect argument data type or missing argument in call to function 'zero'?
Change the function from ZERO to ZEROS. ZEROS creates an array of the value 0: https://www.mathworks.com/help/matlab/ref/zeros....

3 years ago | 1

Answered
how filter "*.*" when using uigetfile function.
If there are no descriptors, the "All files" is automatically appened onto the end of the filter. The solution is to add descrip...

3 years ago | 0

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Answered
How to subtract ?
The simple MATLAB approach: S = load("allmat.mat"); M = S.allmat M(:,6) = M(1,6)-cumsum(M(:,5))

3 years ago | 0

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Answered
Creating a table by extracting rows from a table based off their values in relation to another table of a different size.
a = [11;33;55;77;99;23;45;67;89;87;65;43;10;1;3;5]; b = [22;44;66;88;12;34;56;78;98;76;54;32;21;2;4;6]; c = [2;2;2;2;4;4;4;4;6...

3 years ago | 0

Answered
I got wrong data when i use datetime convertfrom
S = load('time.mat'); D = S.time T = datetime(1800,1,1) + hours(D)

3 years ago | 0

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Answered
How to use the command window in order to make a script faster and interactive?
I had to write a script to carefully remove all of those numbers from the variable names and recreate the original MAT files acc...

3 years ago | 0

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Answered
Using diff(x) function to create a new table by subtracting values from the previous row
M = readmatrix('Data241.xlsx') [~,idr] = sort(isnan(M),1); [~,idc] = ndgrid(1:size(M,1),1:size(M,2)); A = -diff(M(sub2ind(siz...

3 years ago | 1

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Answered
Error in datetime array format for writing new matrix
Ah, fractional years. Here is one way to convert a fractional year (yes, even leap years) to datetime: format long G M = readm...

3 years ago | 0

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Answered
Matlab Vlookup/Indexing equivalent
DT = [datetime(2027,1,1,(0:4).',0,0);datetime(2028,1,1,0,0,0)] Y = year(DT); M = [2027,1.2,200,350;2028,3.7,200,350;2029,7.2,2...

3 years ago | 0

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Answered
How to interchange position of a matrix?
A = [3,1,2]; B = [2,3,1]; X = [2,1,3]; for k = 1:numel(X) X([A(k),B(k)]) = X([B(k),A(k)]); end X

3 years ago | 1

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Answered
How can I split string based on a sting array?
S = "alpha{ beta} new {} new2}"; T = ["alpha","beta", "{","}"]; [X,Y] = strsplit(S,T, 'CollapseDelimiters',false); X = strtri...

3 years ago | 0

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Answered
Variable name from a cell content
You could use a structure to store all of the tables: F = "Input.xlsx"; S = sheetnames(F); D = struct(); for k = 1:numel(S) ...

3 years ago | 0

Answered
Access variables with naming in workspace
This appears to be a follow up from your question from seven hours ago: https://www.mathworks.com/matlabcentral/answers/1804720...

3 years ago | 2

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Answered
Condense code in Split string operation
s = "xxx_yyy_zzz.xlsx"; regexp(s,'[^_.]+(?=\.)','match','once')

3 years ago | 1

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Answered
My matlab code with interp3 is not providing me correct answer. Please help.
format compact T = readtable('interpcheck.csv') A = accumarray([T.x,T.y,T.z],T.result) X = unique(T.x); Y = unique(T.y); Z ...

3 years ago | 0

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Answered
Where is the Documentation for Indexing on the Left Hand Side of an Assignment?
Here: https://blogs.mathworks.com/loren/2020/01/31/repeated-indexing-in-matlab/ https://blogs.mathworks.com/loren/2007/07/26/as...

3 years ago | 1

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Answered
extract the last value from each cell in array?
The simple MATLAB approach: M = readmatrix('transRewards_40_0.1_2.csv', 'LineEnding',']', 'TrimNonNumeric',true) plot(M(:,20))...

3 years ago | 0

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Answered
Questions about the rgb2gray function
"does anyone know why?" The values shown in the documentation are shown only to 3 decimal places. The actual values used for t...

3 years ago | 0

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Answered
Replacing values of a vector with values in another vector of a different size
A = [0,0,0,1,1,1,0,0,1,1,0,0,0]; B = [1,2,3,inf,4]; C = double(A); C(A==1) = B; C(isinf(C)) = 0

3 years ago | 0

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Answered
How do I compare two shuffled vectors, and get the indexes of one as it appears in the other?
A = ["cond1","cond2","cond3","cond4"]; b = ["cond4","cond2","cond1","cond3"]; [~,X] = ismember(A,b)

3 years ago | 1

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Answered
Problem with accessing struct in a struct
"Why didnt my idea work out accessing the variable/array in the struct in the struct by using the command oe_sum.a.A for example...

3 years ago | 0

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Answered
Improve speed of execution by pre allocation of array
"How preallocation could be done in this and similar case?" In that and similar cases the MATLAB approach would be to simply as...

3 years ago | 0

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