MATLAB: Changing color of point in stem plot based on value

colorgraphplotplottingstemvalue

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.

Best Answer

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)

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MATLAB: How to draw a discontinue function

t = 0:0.01:2*pi;
x = cos(t);
y = x;
y(abs(x)>0.5) = 0.5;
% to see the discontinuity
stem(t(1:400),y(1:400))

If you really want to see the discontinuity most clearly, it's probably a good idea to delete the baseline in the stem plot.

   h = stem(t(150:250),y(150:250),'markerfacecolor',[0 0 1]);
   axis tight;
   delete(get(h,'baseline'))

MATLAB: Shade area under curve between 2 x-axis limits

x=0:pi/50:2*pi;
y1=x.^2;
H1=area(x,y1);
hold on
idx=x>3&x<4;
H=area(x(idx),y1(idx));
set(H(1),'FaceColor',[1 0.5 0]);

close
x=0:pi/50:2*pi;
y1=x.^2;
%baseval1=20;
%baseval2=3;
%clf;
H1=area(x,y1,'FaceColor',[1 1 1]);
hold on
idx=x>3&x<4;
H=area(x(idx),y1(idx));
set(H(1),'FaceColor',[1 0.5 0]);

Best Answer

Related Solutions

MATLAB: How to draw a discontinue function

MATLAB: Shade area under curve between 2 x-axis limits

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