Same color lines in legend using a for loop

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Noah
Noah il 20 Set 2022
Commentato: Mathieu NOE il 12 Feb 2023
When I try and run this code, all the lines in the legend show up as red lines instead of different colors.
hold on
for i = 1:length(g)
if g(i) >= 2
plot(x,y,Color='b');
else
plot(x2,y2,Color='r');
end
end
hold off
hold on
plot(x2,y2,Color='y');
plot(x3,x3,,Color='m');
hold off
legend('l1','l2','l3','l4')
  1 Commento
Dyuman Joshi
Dyuman Joshi il 20 Set 2022
1 - Do not use equal-to "=" sign between 'Color', and color value, inside the plot() function.
Use a comma ","
2 - Using "hold on" immediately after "hold off" seems a bit redundant.
3 - You might be overwriting the x2-y2 curve, color 'r' with itself x2-y2 curve, color 'y'. In the case, you would only find 3 curves
Other than this, I can not say what the error is (if it occurs after considering above points), data for the variables will be required to make any more comments on it.

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Risposte (1)

Mathieu NOE
Mathieu NOE il 21 Set 2022
hello
why make simple things complicated ?
if you have only 4 arrays to plot , you could do directly the plot like this - and the colors appears correctly in the legend box
% dummy data
x = 1:5;
y = 2*x+1;
x2 = 1.5*x;
y2 = 2*y+1;
x3 = 0.5*x;
% plot
figure
plot(x,y,'b',x2,y2,'r',x2+1,y2+1,'y',x3,x3,'m');
legend('l1','l2','l3','l4')
if you want a for loop and assign a color / line style different to each line , you can do this :
t = 0:pi/50:2*pi;
MarkerStyle={'o','+','*','x','s','d','v','>'};
Colors=[1 0 0; 1 0 1; 0 1 0; 0.4660 0.6740 0.1880; 0 0 1; 0.3010 0.7450 0.9330; 0.8500 0.3250 0.0980; 0.9290 0.6940 0.1250]
figure(1),hold on
for ck = 1:8
p = plot(t,sin((1+0.2*ck)*t),'LineWidth',2,'Color',Colors(ck,:),'Marker',MarkerStyle{ck});
leg_str{ck} = (['Line #' num2str(ck)]);
end
legend(leg_str);
  3 Commenti
Sophia Ehlers
Sophia Ehlers il 11 Feb 2023
This does'nt work for me, is it possible that this only works for plots but not for error bars? Or what other possible mistakes have i made?
color = [0.933 0.443 0.0; 0.0 0.30588 0.62351; 0.0 0.6588 0.475; 161./255 217./255 248./255; 0./255 120./255 120./255];
Legends={'10,2 °C'; '15 °C'; '21,8 °C'; '26 °C'; '30 °C'};
%get multiple sets of data
for file_j = 1:5
file = strcat('Kennlinien', '_', num2str(file_j), '.txt');
data = load(file,'txt');
U = data(:,1); % Voltage Data
I = data(:,2); % Current Data
%errors
errU = 0.01.*ones(size(U));
errI = 0.01.*ones(size(I));
%plot
e = errorbar(I ,U , errU, errU, errI, errI, 'o', 'Color', color(file_j,:),'Marker','o', 'MarkerSize',6);
Legend{file_j}=(['T_' num2str(file_j) '=' Legends{file_j}]);
end
Error using load
Unable to find file or directory 'Kennlinien_1.txt'.
legend(Legend,'Location', 'Northwest');
Mathieu NOE
Mathieu NOE il 12 Feb 2023
hello
seems that the file "Kennlinien_1.txt" is simply not present in your current directory
please double check
dir *.txt
all the best

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