Load multiple files to MATLAB without changing name manually

Hello, I have written a program for signal analyzing and I want to apply it to different files. Is there any ways to upload multiple files automatically without the needs of changing the file name manually as shown below?

cm = readtable('signal1.csv', 'VariableNamingRule','preserve');

Thank you if someone can assist me.

[Stephen23]

https://www.mathworks.com/help/matlab/import_export/process-a-sequence-of-files.html

Answer 1

[Chunru]

% list the files to be processed
fn = dir("signal*.csv");

for ifile=1:length(fn)
    
current_fn = fn(ifile).name;
% [file,path]=uigetfile('*.csv','MultiSelect','on');
cm = readtable(current_fn, 'VariableNamingRule','preserve');
cmVar = cm.Properties.VariableNames;

figure
plot(cm{:,1},cm{:,[2 3]})
grid
xlabel(cmVar{1})
legend(cmVar{[2 3]}, 'Location','best')
title('Original Signal')

env1 = envelope(cm{:,2}, 250, 'peak');
figure
plot(cm{:,1},cm{:,[2 3]})
hold on
plot(cm{:,1},env1,'LineWidth',2)
hold off 
grid
xlabel(cmVar{1})
legend(cmVar{[2 3]},'Envelope','Location','best')
title('Original Signal with Envelope')

Threshold = 5;
Lv = env1 >= Threshold;
figure
plot(cm{Lv,1},cm{Lv,[2 3]})
grid
xlabel(cmVar{1})
legend(cmVar{[2 3]},'Location','best')
title('Edited Signal')


figure
Fs = 1/cm{2,1};
findpeaks(cm{Lv,2},Fs,'MinPeakDistance',0.016,'MinPeakProminence',15,'MinPeakHeight',15);
[pksRT,locsRT] = findpeaks(cm{Lv,2},Fs,'MinPeakDistance',0.016,'MinPeakProminence',15,'MinPeakHeight',15);
pksRT1 = num2cell(pksRT);
legend(cmVar{2},'Location','bestoutside')
text(locsRT,pksRT+5,pksRT1,'FontSize',8,'Rotation',90)

Period = diff(locsRT);
Period_mean = mean(Period);
Period_min= min(Period);
Period_max = max(Period);

impact= table (Period);
impact.Frequency = (1./Period)*60;

torque_rms = rms(cm{Lv,"Reaction Torque [Nm]"});
current_rms = rms(cm{Lv,"Current RMS [amp]"});
Step_res=stepinfo(cm.("Reaction Torque [Nm]"),cm.("Time [s]"))

Area_torque=cumtrapz(cm{Lv,"Time [s]"},cm{Lv,"Reaction Torque [Nm]"});

Overall_data = table(torque_rms,current_rms, Period_max, Period_min, Period_mean);
Overall_data.Area_torque = Area_torque(end);
% writetable (Overall_data, 'ML_Data.csv')
% writetable (impact, 'ML_Data.csv')

end

Step_res = struct with fields:
         RiseTime: 2.9760e-04
    TransientTime: 1.6248
     SettlingTime: 5.0122
      SettlingMin: -62.5159
      SettlingMax: 89.4734
        Overshoot: 8.6106e+04
       Undershoot: 6.0233e+04
             Peak: 89.4734
         PeakTime: 1.5416

Step_res = struct with fields:
         RiseTime: 1.3524e-04
    TransientTime: 1.4950
     SettlingTime: 5.0122
      SettlingMin: -67.2468
      SettlingMax: 85.3903
        Overshoot: 9.6159e+04
       Undershoot: 1.2223e+05
             Peak: 85.3903
         PeakTime: 1.3180

Step_res = struct with fields:
         RiseTime: 6.5838e-04
    TransientTime: 1.7612
     SettlingTime: 5.0122
      SettlingMin: -67.9828
      SettlingMax: 81.1703
        Overshoot: 1.6333e+05
       Undershoot: 1.9514e+05
             Peak: 81.1703
         PeakTime: 1.3112

[Yew Jen Chong]

Thank you @Chunru for your helping.

Another additional question hope you don't mind.

Do you know how to store the data for each loop?

I have tried but the variable only contain the data of the last loop.

size = [length(fn) 6];
varNames = ["Torque_rms","Current_rms","Period_max","Period_Min","Period_mean","Area_torque"];
varTypes = ["double","double","double","double","double","double"];
Overall_data = table('Size',size,'VariableTypes',varTypes,'VariableNames',varNames);
Overall_data(ifile,:) = {torque_rms,current_rms, Period_max, Period_min, Period_mean,Area_torque(end)};

Answer 2

[Karim]

Hey, you can read the data via a loop, see below.

Best regards

numFiles = 3;

for nF = 1:numFiles
    
    cm = readtable(['signal',num2str(nF),'.csv'], 'VariableNamingRule','preserve');
    
    % put other process code here
    
end