how can i plot many series of values in the same plot

Question

federico 2023-8-26

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编辑： Dyuman Joshi 2023-8-27

i have a series of txt files which i need to use to make one single plot with all of them in it but this command seems not to work properly.

i'm kinda new to matlab so a friend tried to help me out with this one but i don't know how to make it work.

it gives me an error on the first line

%% Import single I-V
clear, clc; close all; % clear variables and cmd window, close figures
% Import raw measurement .epr file
[FileName,FilePath] = uigetfile('*.txt','Choose a measurement');
File = [FilePath, FileName];
data = readmatrix(File,'Range','A1:B70','FileType','delimitedtext');
V = data(:,1);
I = data(:,2);
%% Plot single I-V
figure(1);
plot(V,I,'- .','DisplayName',FileName)
% semilogy(V,abs(I),'- .','DisplayName',FileName)
xlabel('Voltage (V)')
ylabel('Current (mA)')
axis tight
xline(0,'HandleVisibility','off')
yline(0,'HandleVisibility','off')
grid on
box on
legend('Location','northwest','FontSize',8,'Interpreter','None')
pbaspect([1.25 1 1])
%% Import all I-V
% Clear all variables, close all figures, clear command window
clear; close all; clc; 
% Navigate Current Folder to folder containing all files
% Get all .epr files in current directory
txt_files = dir('*.txt');
% Initialise empty cell array to store data
data = cell(0);
% Loop through each csv file to read data from specific rows and columns
for i = 1:numel(txt_files)
    data{i} = readmatrix(txt_files(i).name,'Range','A1:B70','FileType','delimitedtext');
end
%% Plot all I-V 
for i = 1:numel(txt_files)
    V = data{1, i}(:,1);
    I = data{1, i}(:,2);
    figure(1);
    plot(V,I,'- .','DisplayName',txt_files(i).name)
    % semilogy(V,abs(I),'- .','DisplayName',txt_files(i).name)
    hold on
end
hold off
xlabel('Voltage (V)')
ylabel('Current (mA)')
axis tight
%xline(0,'HandleVisibility','off')
%yline(0,'HandleVisibility','off')
grid on
box on
legend('Location','northwest','FontSize',8,'Interpreter','None')
pbaspect([1.25 1 1])

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Star Strider 2023-8-26

What is the error?

It works for me (with an arbitrary file) through ‘figure(1)’. (I don’t have the other files so I didn’t run the rest of it.)

federico 2023-8-26

i don't know how for other codes like this works but it plots only the selected one, like i said it gives error but i do not see where it can be.

do you happen to have a simpler code since i'm still new to the platform?

ex of code working but only plots one:

clear

%Importare dati, indicare percorso file dati completo

load ST_n_293_testo.txt;

xdata=ST_n_293_testo(:,1); % v (riga, colonna)

ydata=log(ST_n_293_testo(:,2)); % i (riga, colonna)

%plot dati

plot(xdata,ydata,'ro');

title('I-V @ 293K')

xlabel('V [V]');

ylabel('I [mA]');

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Answer 1

Star Strider 2023-8-26

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2013412-how-can-i-plot-many-series-of-values-in-the-same-plot#answer_1294182

Looking a bit more carefully at your posted code, I believe the problem is that you are creating a new figure in each loop iteration.

Try this instead:

figure(1);

for i = 1:numel(txt_files)

V = data{1, i}(:,1);

I = data{1, i}(:,2);

plot(V,I,'- .','DisplayName',txt_files(i).name)

% semilogy(V,abs(I),'- .','DisplayName',txt_files(i).name)

hold on

end

I could not run the code, so I did not see that before.

.

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Star Strider 2023-8-26

在 MATLAB Online 中打开

This seems to work correctly here (R2023a).

What do you want your code to do?

% Import raw measurement .epr file

% [FileName,FilePath] = uigetfile('*.txt','Choose a measurement');

Files = dir('*.txt')

Files = 15×1 struct array with fields:

name folder date bytes isdir datenum

FileName = Files(1).name

FileName = 'ST_n_100_testo.txt'

File = FileName

File = 'ST_n_100_testo.txt'

% File = [FilePath, FileName];

data = readmatrix(File,'Range','A1:B70','FileType','delimitedtext');

V = data(:,1);

I = data(:,2);

%% Plot single I-V

figure(1);

plot(V,I,'- .','DisplayName',FileName)

% semilogy(V,abs(I),'- .','DisplayName',FileName)

xlabel('Voltage (V)')

ylabel('Current (mA)')

axis tight

xline(0,'HandleVisibility','off')

yline(0,'HandleVisibility','off')

grid on

box on

legend('Location','northwest','FontSize',8,'Interpreter','None')

pbaspect([1.25 1 1])

%% Import all I-V

% Clear all variables, close all figures, clear command window

clear; close all; clc;

% Navigate Current Folder to folder containing all files

% Get all .epr files in current directory

txt_files = dir('*.txt');

% Initialise empty cell array to store data

data = cell(0);

% Loop through each csv file to read data from specific rows and columns

for i = 1:numel(txt_files)

data{i} = readmatrix(txt_files(i).name,'Range','A1:B70','FileType','delimitedtext');

end

%% Plot all I-V

for i = 1:numel(txt_files)

V = data{1, i}(:,1);

I = data{1, i}(:,2);

figure(1);

plot(V,I,'- .','DisplayName',txt_files(i).name)

% semilogy(V,abs(I),'- .','DisplayName',txt_files(i).name)

hold on

end

hold off

xlabel('Voltage (V)')

ylabel('Current (mA)')

axis tight

%xline(0,'HandleVisibility','off')

%yline(0,'HandleVisibility','off')

grid on

box on

legend('Location','northwest','FontSize',8,'Interpreter','None')

pbaspect([1.25 1 1])

.

federico 2023-8-26

移动：Cris LaPierre 2023-8-27

oh i see the problem was specifing the folder files, since i had to convert them from .ivc to .txt i had both copies in the same folders and mistakes were made while editing blanks spots.

thanks for the patience and the response.

Star Strider 2023-8-26

移动：Cris LaPierre 2023-8-27

As always, (our) pleasure!

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Answer 2

Cris LaPierre 2023-8-26

0
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2013412-how-can-i-plot-many-series-of-values-in-the-same-plot#answer_1294177

编辑：Cris LaPierre 2023-8-26

在 MATLAB Online 中打开

If you want multiple lines to appear with a single plot command, you need to be plotting a matrix. Each column of data is treated as a series.

X = 1:10;

% 3 columns so 3 lines

Y = rand(10,3);

plot(X,Y)

You can also use multple plot commands combined with a 'hold on'. Without it, each plot command replaces the previous plot.

plot(X,Y(:,1))

hold on

plot(X,Y(:,2))

plot(X,Y(:,3))

hold off

If you haven't done so already, I suggest going through MATLAB Onramp. Ch 9 covers plotting.

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federico 2023-8-26

i'll check this as well, thank you

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