Problems with cell array plotting

Hello everybody,

I have a little issue with a cell array. I have to do lots of plots for my project. However, I worked with cells with 2 or with 3 columns and that worked out. Now, I have data with 4 columns and the way I used to do it does not work anymore. anyone an Idea?

clear all; 
close all;
clc

%%labels['Ld-50%' 'Ld-45%' 'Ld-40%' 'Ld-35%' 'Ld-30%' 'Ld-25%' 'Ld-20%' 'Ld-15%' 'Ld-10%' 'Ld' 'Ld+10%' 'Ld+15%' 'Ld+20%' 'Ld+25%' 'Ld+30%' 'Ld+35%' 'Ld+40%' 'Ld+45%' 'Ld+50%'];

%%Second part for reading in multiple files

Drpm = 'C:\Users\Brendan\OneDrive\Masterarbeit_prädiktive_Stromregler\Modelle\01_Parameter\01_Ld\rpm';
filesrpm = dir(fullfile(Drpm, '*.csv'));
Dtorquemech = 'C:\Users\Brendan\OneDrive\Masterarbeit_prädiktive_Stromregler\Modelle\01_Parameter\01_Ld\meschanisches Moment';
filestorquemech = dir(fullfile(Dtorquemech, '*.csv'));
Dtorqueel = 'C:\Users\Brendan\OneDrive\Masterarbeit_prädiktive_Stromregler\Modelle\01_Parameter\01_Ld\elektrisches Moment';
filestorqueel = dir(fullfile(Dtorqueel, '*.csv'));
Didg = 'C:\Users\Brendan\OneDrive\Masterarbeit_prädiktive_Stromregler\Modelle\01_Parameter\01_Ld\id Gegenwart';
filesidg = dir(fullfile(Didg, '*.csv'));
Diqg = 'C:\Users\Brendan\OneDrive\Masterarbeit_prädiktive_Stromregler\Modelle\01_Parameter\01_Ld\iq Gegenwart';
filesiqg = dir(fullfile(Diqg, '*.csv'));
Didz = 'C:\Users\Brendan\OneDrive\Masterarbeit_prädiktive_Stromregler\Modelle\01_Parameter\01_Ld\id Zukunft';
filesidz = dir(fullfile(Didz, '*.csv'));
Diqz = 'C:\Users\Brendan\OneDrive\Masterarbeit_prädiktive_Stromregler\Modelle\01_Parameter\01_Ld\iq Zukunft';
filesiqz = dir(fullfile(Diqz, '*.csv'));
Dcf = 'C:\Users\Brendan\OneDrive\Masterarbeit_prädiktive_Stromregler\Modelle\01_Parameter\01_Ld\Cost function';
filescf = dir(fullfile(Dcf, '*.csv'));
Dcurrents = 'C:\Users\Brendan\OneDrive\Masterarbeit_prädiktive_Stromregler\Modelle\01_Parameter\01_Ld\a,b,c Ströme';
filescurrents = dir(fullfile(Dcurrents, '*.csv'));

for i = 1:19 

%Drehzahl
    fnmrpm = fullfile(Drpm,filesrpm(i).name); 
    datarpm{i} = readmatrix(fnmrpm); 
    yrpm = num2cell(datarpm, 1);
    thelprpm = yrpm{1};
    trpm = thelprpm{1}(:, 1);

%mechanisches Moment
    fnmtorquemech = fullfile(Dtorquemech,filestorquemech(i).name); 
    datatorquemech{i} = readmatrix(fnmtorquemech); 
    ytorquemech = num2cell(datatorquemech, 1);

%elektrisches Moment    
    fnmtorqueel = fullfile(Dtorqueel,filestorqueel(i).name); 
    datatorqueel{i} = readmatrix(fnmtorqueel); 
    ytorqueel = num2cell(datatorqueel, 1);

%id Gegenwart    
    fnmidg = fullfile(Didg,filesidg(i).name); 
    dataidg{i} = readmatrix(fnmidg); 
    yidg = num2cell(dataidg, 1);

%iq Gegenwart    
    fnmiqg = fullfile(Diqg,filesiqg(i).name); 
    dataiqg{i} = readmatrix(fnmiqg); 
    yiqg = num2cell(dataiqg, 1);

%id Zukunft
    fnmidz = fullfile(Didz,filesidz(i).name); 
    dataidz{i} = readmatrix(fnmidz); 
    yidz = num2cell(dataidz, 1);

%iq Zukunft
    fnmiqz = fullfile(Diqz,filesiqz(i).name); 
    dataiqz{i} = readmatrix(fnmiqz); 
    yiqz = num2cell(dataiqz, 1);
%Cost function
    fnmcf = fullfile(Dcf,filescf(i).name); 
    datacf{i} = readmatrix(fnmcf); 
    ycf = num2cell(datacf, 1);

%abc Ströme
    fnmcurrents = fullfile(Dcurrents,filescurrents(i).name); 
    datacurrents{i} = readmatrix(fnmcurrents); 
    ycurrents = num2cell(datacurrents, 1);
end

for i=1:19

    rpmc{i} = datarpm{i}(:, 2);
    torquemechc{i} = datatorquemech{i}(:, 2);
    torqueelc{i} = datatorqueel{i}(:, 2);
    idgc{i} = dataidg{i}(:, 2);
    iqgc{i} = dataiqg{i}(:, 2);
    idzc{i} = dataidz{i}(:, 2);
    iqzc{i} = dataiqz{i}(:, 2);
    cfc{i} = datacf{i}(:, [2 3]);
    currentsc = datacurrents{i}(:, [2 3 4]);
end

for i=1:19
    rpm = rpmc{i};
    thelp = yrpm{1,i};
    trpm = thelp{1}(:, 1);
    plot(trpm,rpm)
    %legend('Ld-50%', 'Ld-45%', 'Ld-40%', 'Ld-35%', 'Ld-30%', 'Ld-25%', 'Ld-20%', 'Ld-15%', 'Ld-10%', 'Ld', 'Ld+10%', 'Ld+15%', 'Ld+20%', 'Ld+25%', 'Ld+30%', 'Ld+35%', 'Ld+40%', 'Ld+45%', 'Ld+50%')
    hold all
end

figure
for i = 1:19
    torquemech = torquemechc{i};
    thelptorquemech = ytorquemech{1,i};
    ttorquemech = thelptorquemech{1}(:, 1);
    plot(ttorquemech,torquemech)
    %legend('Ld-50%', 'Ld-45%', 'Ld-40%', 'Ld-35%', 'Ld-30%', 'Ld-25%', 'Ld-20%', 'Ld-15%', 'Ld-10%', 'Ld', 'Ld+10%', 'Ld+15%', 'Ld+20%', 'Ld+25%', 'Ld+30%', 'Ld+35%', 'Ld+40%', 'Ld+45%', 'Ld+50%')
    hold all
    
end

figure
for  i = 1:19
    torqueel = torqueelc{i};
    thelptorqueel = ytorqueel{1,i};
    ttorqueel = thelptorqueel{1}(:, 1);
    plot(ttorqueel,torqueel)
    %legend('Ld-50%', 'Ld-45%', 'Ld-40%', 'Ld-35%', 'Ld-30%', 'Ld-25%', 'Ld-20%', 'Ld-15%', 'Ld-10%', 'Ld', 'Ld+10%', 'Ld+15%', 'Ld+20%', 'Ld+25%', 'Ld+30%', 'Ld+35%', 'Ld+40%', 'Ld+45%', 'Ld+50%')
    hold all
    
end

figure
for  i = 1:19
    idg = idgc{i};
    thelpidg = yidg{1,i};
    tidg = thelpidg{1}(:, 1);
    plot(tidg,idg)
    %legend('Ld-50%', 'Ld-45%', 'Ld-40%', 'Ld-35%', 'Ld-30%', 'Ld-25%', 'Ld-20%', 'Ld-15%', 'Ld-10%', 'Ld', 'Ld+10%', 'Ld+15%', 'Ld+20%', 'Ld+25%', 'Ld+30%', 'Ld+35%', 'Ld+40%', 'Ld+45%', 'Ld+50%')
    hold all
    
end

figure
for  i = 1:19
    iqg = iqgc{i};
    thelpiqg = yiqg{1,i};
    tiqg = thelpiqg{1}(:, 1);
    plot(tiqg,iqg)
    %legend('Ld-50%', 'Ld-45%', 'Ld-40%', 'Ld-35%', 'Ld-30%', 'Ld-25%', 'Ld-20%', 'Ld-15%', 'Ld-10%', 'Ld', 'Ld+10%', 'Ld+15%', 'Ld+20%', 'Ld+25%', 'Ld+30%', 'Ld+35%', 'Ld+40%', 'Ld+45%', 'Ld+50%')
    hold all
    
end

figure
for  i = 1:19
    idz = idzc{i};
    thelpidz = yidz{1,i};
    tidz = thelpidz{1}(:, 1);
    plot(tidz,idz)
    %legend('Ld-50%', 'Ld-45%', 'Ld-40%', 'Ld-35%', 'Ld-30%', 'Ld-25%', 'Ld-20%', 'Ld-15%', 'Ld-10%', 'Ld', 'Ld+10%', 'Ld+15%', 'Ld+20%', 'Ld+25%', 'Ld+30%', 'Ld+35%', 'Ld+40%', 'Ld+45%', 'Ld+50%')
    hold all
    
end

figure
for  i = 1:19
    iqz = iqzc{i};
    thelpiqz = yiqz{1,i};
    tiqz = thelpiqz{1}(:, 1);
    plot(tiqz,iqz)
    %legend('Ld-50%', 'Ld-45%', 'Ld-40%', 'Ld-35%', 'Ld-30%', 'Ld-25%', 'Ld-20%', 'Ld-15%', 'Ld-10%', 'Ld', 'Ld+10%', 'Ld+15%', 'Ld+20%', 'Ld+25%', 'Ld+30%', 'Ld+35%', 'Ld+40%', 'Ld+45%', 'Ld+50%')
    hold all
    
end

figure
for  i = 1:19
    cf = cfc{i};
    thelpcf = ycf{1,i};
    tcf = thelpcf{1}(:, 1);
    plot(tcf,cf)
    %legend('Ld-50%', 'Ld-45%', 'Ld-40%', 'Ld-35%', 'Ld-30%', 'Ld-25%', 'Ld-20%', 'Ld-15%', 'Ld-10%', 'Ld', 'Ld+10%', 'Ld+15%', 'Ld+20%', 'Ld+25%', 'Ld+30%', 'Ld+35%', 'Ld+40%', 'Ld+45%', 'Ld+50%')
    hold all
    
end

figure
for  i = 1:19
    currents = currentsc{i};
    thelpcurrents = ycurrents{1,i};
    tcurrents = thelpcurrents{1}(:, 1);
    plot(tcurrents,currents)
    %legend('Ld-50%', 'Ld-45%', 'Ld-40%', 'Ld-35%', 'Ld-30%', 'Ld-25%', 'Ld-20%', 'Ld-15%', 'Ld-10%', 'Ld', 'Ld+10%', 'Ld+15%', 'Ld+20%', 'Ld+25%', 'Ld+30%', 'Ld+35%', 'Ld+40%', 'Ld+45%', 'Ld+50%')
    hold all
    
end

[Stephen23]

" the way I used to do it does not work anymore. anyone an Idea?"

Please explain what "does not work" means: do you get a plot but with unexpected values, or no plots at all, or an unexpected number of plots, or lots of warnings, or an error is thrown...? Guessing what "does not work" means is much less reliable than you actually telling us.

[Brendan Rapp]

Oh, I'm sorry!

I get an error thrown, that the brace indexing is not supported for variables of this type. (below)

Error in Variation_Ld (line 178)

currents = currentsc{i};

[Dyuman Joshi]

It seems that the variable currentsc is not of type cell. Can you confirm this by using the line -

class(currentsc)

before the last for loop?

[Brendan Rapp]

It states that currentsc is already a double, but I cannot plot it. maybe because it is an more dimensional double?

[Dyuman Joshi]

You are trying to access a double array via curly brackets, which is not possible. Use parenthesis to access elements of a double array.

%Example
y = magic(5)

y = 5×5

17 24 1 8 15 23 5 7 14 16 4 6 13 20 22 10 12 19 21 3 11 18 25 2 9

y(7)

ans = 5

y{7}

Brace indexing is not supported for variables of this type.

[Brendan Rapp]

That helped thank you!

Answer 1

[Voss]

Change this:

currentsc = datacurrents{i}(:, [2 3 4]);

to this:

currentsc{i} = datacurrents{i}(:, [2 3 4]);