Plotting range of files using hold on in for loop

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shedrach
shedrach 2025-1-6
编辑： KALYAN ACHARJYA 2025-1-6
i have 3 groups of files in the same folder. i have selected them base on their index. i want to plot one file from each group on a figure using hold on. that is for each figure, i would have 3 plots with a total of three figures. I have my code like this below but it seems like i am getting only the last figure.
startIndex = 1;
endIndex = 3;
startIndex1 = 4;
endIndex1 = 6;
startIndex2 = 7;
endIndex2 = 9;
filelist = dir('C:\Users\shedr\Downloads\tec data\2017\DOBUM\ttr\ttr1\tt4\*.mat');
% filelistt = dir('C:\Users\shedr\Downloads\tec data\2017\DOBUM\ttr\ttr1\*.mat');
% first set of files
for fileidx = startIndex:endIndex
% count1 = count1+1;
spectrum = load(filelist(fileidx).name);
C = spectrum.B;
CC = cell2mat(C)
% second set of files
fileidx1 = startIndex1+(fileidx-startIndex)
% count2 = count2+1;
% count2 = count1
spectrum1 = load(filelist(fileidx1).name);
C1 = spectrum.B;
CC1 = cell2mat(C1)
fileidx2 = startIndex2+(fileidx-startIndex)
% count2 = count2+1;
% count2 = count1
spectrum2 = load(filelist(fileidx2).name);
C2 = spectrum.B;
CC2 = cell2mat(C2)
plot(CC, 'displayname', filelist(fileidx).name);
hold on
plot(CC1,'displayname', filelist(fileidx1).name);
hold on
plot(CC2,'displayname',filelist(fileidx2).name);
end
hold off
legend('show')

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回答（1 个）

Cris LaPierre
Cris LaPierre 2025-1-6
I think you need to add a figure command to your code. Otherwise, plot will overwrite the current figure.
startIndex = 1;
endIndex = 3;
startIndex1 = 4;
startIndex2 = 7;
filelist = dir('C:\Users\shedr\Downloads\tec data\2017\DOBUM\ttr\ttr1\tt4\*.mat');
% first set of files
for fileidx = startIndex:endIndex
spectrum = load(filelist(fileidx).name);
C = spectrum.B;
CC = cell2mat(C)
% second set of files
fileidx1 = startIndex1+(fileidx-startIndex)
spectrum1 = load(filelist(fileidx1).name);
C1 = spectrum.B;
CC1 = cell2mat(C1)
fileidx2 = startIndex2+(fileidx-startIndex)
spectrum2 = load(filelist(fileidx2).name);
C2 = spectrum.B;
CC2 = cell2mat(C2)
figure
plot(CC, 'displayname', filelist(fileidx).name);
hold on
plot(CC1,'displayname', filelist(fileidx1).name);
plot(CC2,'displayname',filelist(fileidx2).name);
hold off
legend('show')
end

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