Stephen23

Active since 2014

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Answered
create cell array by extracting all the same row from multiple matrix
"Is this achievable through cellfun?" Yes: A = rand(105,3); B = rand(105,3); C = rand(105,3); D = cellfun(@vertcat,num2cell...

1 day ago | 0

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Answered
I want to enter a mathematical function as an argument to a function
The simple approach using a function handle: plot_compare(@sin , 5 ,20); plot_compare(@(t) 4*t+9 , 5 ,20); function plot_co...

2 days ago | 0

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Answered
How to create a table from strings and numerical data?
" I don't want to preallocate anything as the sizes are unknown. I wanna start with an empty table and then after first iteratio...

3 days ago | 0

Answered
Plot the last value from each cell from excel file
"Could you please provide me the best way to extract the last values in each cell and plot it?" Sure, I already did that sixtee...

3 days ago | 0

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Answered
Alternative to Eval for small number of variables
Approaches like EVAL and structure fields for this task are far too complex. You need to learn how to use arrays to write simpl...

3 days ago | 0

Answered
Convert input item into string
https://www.mathworks.com/help/matlab/ref/inputname.html

4 days ago | 1

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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(...

6 days 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(...

7 days 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...

8 days 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)]))

9 days 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),'%...

9 days 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...

10 days ago | 0

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

10 days ago | 1

Answered
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') ...

12 days 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....

13 days 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...

13 days 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))

13 days 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...

14 days 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)

14 days 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...

15 days 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...

15 days 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...

15 days 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...

15 days 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

15 days 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...

15 days 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) ...

15 days 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...

15 days ago | 2

Answered
Using load for different files with varying names
Here is a robust approach, by not LOADing directly into the workspace, which also also resolves your follow-up question. The cod...

15 days ago | 0

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

16 days 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 ...

17 days ago | 0

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