plotting selected lines from a matrix

2011 6 21
2 个回答
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Hello! This was from a response last week from Sean de for plotting 9 2-D lines for a 3x3x4 matrix:
test = repmat(magic(3),[1 1 4]); %each vector into the third dimension will be the same (so we can verify accuracy)
test2 = reshape(permute(test,[3 2 1]),size(test,3),[]); %permute it and reshape it so that each column represents one vector into the third dimension
plot(test2) %plot it
I've been fiddling around with this code and was wondering: is there a way to print the data from each row on a separate graphs? So for this matrix have the output 3 charts with three lines each.

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Matt Fig
Matt Fig 2011-6-21
I don't see how you can get 3 charts with separate lines each (9 plots total) by plotting the rows of a 4-by-9 matrix (test2). Did you mean to plot the columns instead?

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Sean de Wolski
Sean de Wolski 2011-6-21

1 个投票

doc subplot
Then use a FOR-loop to navigate through.
figure;
for ii = 1:3
subplot(3,1,ii)
hold on
plot(matrix((3*(ii-1)+1):(3*ii),:).')
end
EDIT per comments:
for ii = 1:3
figure
plot(matrix((3*(ii-1)+1):(3*ii),:)')
end
Doesn't produce three unique figures with three lines each?

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Donald
Donald 2011-6-21
hey, the subplot works well but is there a way to have to produce 3 different windows?
Sean de Wolski
Sean de Wolski 2011-6-21
Three different figures instead of subplots?
Sure:
for ii = 1:3
figure;
plot(what I have above)
end
Donald
Donald 2011-6-21
hmm, that doesn't seem to work for me. It simply outputs two blank figures and one that plots the 1-9 rather than all 1s,2s,3s,...
Donald
Donald 2011-6-21
Still no luck. I'm adding this code to what I had above, deleting the original "plot(test2)" and replacing "matrix" with "test2". The code seems to be only plotting the first magic square rather than plotting through the 3rd dimension.
Walter Roberson
Walter Roberson 2011-6-21
for ii = 1:3
fig = figure;
axh = gca('Parent',fig);
plot(axh, matrix((3*(ii-1)+1):(3*ii),:).')
end

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Matt Fig
Matt Fig 2011-6-21

1 个投票

I still think you meant to plot the columns, not the rows. But this works for me:
test = repmat(magic(3),[1 1 4]);
test2 = reshape(permute(test,[3 2 1]),size(test,3),[]);
for ii = [0 3 6]
figure
plot(test2(:,(1:3)+ii))
end

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Donald
Donald
2011-6-21

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