Struggling with multiple csv files

Hello everyone,

I am new to working with reading files in matlab. So, my automated testing generated multiple files like "... rpm_Variation1", "... rpm_Variation2" and so on. Now I came up with the following code:

clear all; 
close all;
clc

%%First part just to test if it works

file = 'C:\Users\Brendan\OneDrive\Masterarbeit_prädiktive_Stromregler\Modelle\01_Parameter\01_Ld\rpm\01_Ld_FCS_MPCCC_rpm_Variation1.csv';


A = readmatrix(file);

x = num2cell(A, 1)

t = x{1}


%%Second part for reading in multiple files

Drpm = 'C:\Users\Brendan\OneDrive\Masterarbeit_prädiktive_Stromregler\Modelle\01_Parameter\01_Ld\rpm';

files = dir (fullfile(Drpm, '*.csv'));

for i = 1:length('files')

       datarpm = readmatrix(files(i).name);
end

The code above gave me following errors:

Error using readmatrix (line 158)

Unable to find or open '01_Ld_FCS_MPCCC_rpm_Variation1.csv'. Check the path and filename or file permissions.

Error in Variation_Ld (line 31) datarpm = readmatrix(files(i).name);

Unfortunately, I don't have an idea how to correct these errors. Does anyone have an idea?

Thank you in advance!

Answer 1

[Stephen23]

"I don't have an idea how to correct these errors. Does anyone have an idea?"

The error message already tells you how: "Check the path and filename or file permissions."

You told DIR, but forgot to tell READMATRIX to look in the correct location.

Drpm = 'C:\Users\Brendan\OneDrive\Masterarbeit_prädiktive_Stromregler\Modelle\01_Parameter\01_Ld\rpm';
files = dir(fullfile(Drpm, '*.csv'));
for i = 1:numel(files) % fixed bug
    fnm = fullfile(Drpm,files(i).name); % added
    datarpm = readmatrix(fnm); % modified
end

[Brendan Rapp]

Worked great! Thank you for your help!