Changing color of point in stem plot based on value
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I'm doing a stem plot of one vector in MATLAB. Can I change the color/marking of only the values that are zero in that vector? Right now, the 'points' of zero are only empty spaces in the stem plot.
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Accepted Answer
Matt Fig
on 7 Apr 2011
No, but that doesn't mean you can't get what you want.
t = (-3*pi:.1:3*pi);
y = round(sin(t)*5)/5;
idx = y~=0;
ynz = y(idx);
yz = y(~idx);
h = stem(t(idx),ynz,'fill','--');
hold on
h(2) = stem(t(~idx),yz);
set(get(h(1),'BaseLine'),'LineStyle',':')
set(h(1),'MarkerFaceColor','red')
set(h(2),'MarkerFaceColor','k','Markersize',8)
3 Comments
Matt Fig
on 7 Apr 2011
In the case of a matrix instead of a vector (didn't you say in your OP that you had a vector??), each column is plotted separately. So do:
t = (-3*pi:.1:3*pi).';
y(:,1) = round(sin(t)*5)/5; % A matrix used for the call to STEM.
y(:,2) = round(cos(t)*5)/5;
idx = y~=0;
ynz = y;
ynz(~idx) = nan;
y(idx) = nan;
h{1} = stem(ynz,'fill','--');
hold on
h{2} = stem(y);
set(get(h{1}(1),'BaseLine'),'LineStyle',':')
set(h{1}(1),'MarkerFaceColor','red')
set(h{2}(1),'MarkerFaceColor','c','Markersize',10)
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