Community Profile # Stephen23

Active since 2014

Suspensa Vix Via Fit

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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...

13 hours 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...

1 day 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...

1 day 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...

2 days ago | 0

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

3 days 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(...

5 days 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(...

5 days 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...

7 days 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)]))

8 days 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),'%...

8 days 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...

8 days 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 ...

9 days 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') ...

10 days 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....

12 days 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...

12 days 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))

12 days 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...

13 days 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)

13 days 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...

13 days 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...

13 days 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...

14 days 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...

14 days 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

14 days 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...

14 days 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) ...

14 days 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...

14 days 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...

14 days ago | 0

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

15 days ago | 1

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