Community Profile # Stephen23

Active since 2014

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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...

en dag ago | 0

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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 dagar ago | 0

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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 dagar ago | 0

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 dagar ago | 0

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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 dagar ago | 0

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

4 dagar ago | 1

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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 dagar ago | 1

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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 dagar ago | 1

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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 dagar ago | 0

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 dagar ago | 0

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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 dagar ago | 0

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 dagar ago | 0

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 dagar ago | 1

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 dagar ago | 1

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 dagar ago | 1

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 dagar ago | 0

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

13 dagar ago | 0

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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 dagar ago | 0

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

14 dagar ago | 0

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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 dagar ago | 0

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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 dagar ago | 1

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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 dagar ago | 0

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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 dagar ago | 0

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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 dagar ago | 1

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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 dagar ago | 0

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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 dagar ago | 0

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 dagar ago | 2

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 dagar ago | 0

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

16 dagar ago | 1

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