# Stephen23

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**Content Feed**

Using an array as an element in a function.

Use element-wise division ./ not matrix division / You will probably also need to use element-wise power .^, not matrix power ^...

circa 7 ore ago | 0

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...

3 giorni ago | 0

| accepted

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...

4 giorni ago | 0

| accepted

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...

5 giorni 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...

5 giorni ago | 0

| accepted

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...

5 giorni ago | 0

Convert input item into string

https://www.mathworks.com/help/matlab/ref/inputname.html

6 giorni ago | 1

| accepted

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(...

8 giorni ago | 1

| accepted

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(...

9 giorni ago | 1

| accepted

replacing text in a string using indexing

For overlapping matches use STRREP. For non-overlapping matches use REGEXPREP: regexprep('qqqqqq','qqq','qwe') regexprep('qqq...

10 giorni 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)]))

11 giorni ago | 0

| accepted

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),'%...

11 giorni 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...

12 giorni ago | 0

| accepted

How inv() works ?

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

12 giorni 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') ...

14 giorni 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....

15 giorni 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...

15 giorni ago | 0

| accepted

How to subtract ?

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

15 giorni ago | 0

| accepted

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...

16 giorni 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)

16 giorni ago | 0

| accepted

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...

17 giorni ago | 0

| accepted

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...

17 giorni ago | 1

| accepted

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...

17 giorni ago | 0

| accepted

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...

17 giorni ago | 0

| accepted

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

17 giorni ago | 1

| accepted

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...

17 giorni ago | 0

| accepted

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) ...

17 giorni 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...

17 giorni 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...

17 giorni ago | 0

Condense code in Split string operation

s = "xxx_yyy_zzz.xlsx"; regexp(s,'[^_.]+(?=\.)','match','once')

18 giorni ago | 1

| accepted