plotting selected lines from a matrix

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.

[Matt Fig]

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?

Answer 1

[Sean de Wolski]

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?

[Donald]

hey, the subplot works well but is there a way to have to produce 3 different windows?

[Sean de Wolski]

Three different figures instead of subplots?

Sure:

for ii = 1:3

figure;

plot(what I have above)

end

[Donald]

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,...

[Sean de Wolski]

see edit.

[Donald]

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]

for ii = 1:3

fig = figure;

axh = gca('Parent',fig);

plot(axh, matrix((3*(ii-1)+1):(3*ii),:).')

end

Answer 2

[Matt Fig]

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

[Donald]

that does the trick. Thanks!