STEM3 plot with different colors

I have a matrix that I wish to plot using STEM3, but I want to color the stem according it according to its value. I don't see any method by which to accomplish this task. Any recommendations.

[Katherine Zheng]

Did you manage to figure out? I want to achieve what you decribed as well.

Answer 1

[Andrew Newell]

I think the short answer is - not easily. Let's take this example from the stem3 documentation:

figure
X = linspace(0,1,10);
Y = X./2;
Z = sin(X) + cos(Y);
h = stem3(X,Y,Z,'fill');
view(-25,30)

If you now type

get(h,'Children')

you get two handles, one of which is all the stems and other is all the lines. These handles don't have any children. I think this is related to the larger problem that you can't ungroup graphical objects in Matlab.

There might be a workaround, because with the data brushing tool you can select one point at a time and change its color - although this changes the color of both stem and line. Still, it means that somewhere (perhaps in the Java code) the individual points are accessible.

Answer 2

[Luz]

I created this simple code for changing colors in 3 sets of data in a stem3 graph.

%Random data in vectors

L = [1 2 3 4 2 6 7]

M=[2 6 4 5 7 8 9]

O=[3 5 8 9 4 7 5]

s=[1,2,3,4,5,6,7]

f=[2,4,6,8,2,4,6]

%I use stem3 and hold on

h= stem3(s,f,L)

hold on

m= stem3(s,f,M)

hold on

o= stem3(s,f,O)

hold off

%Now I can include the colors I want for each set of data

set(h(1),'MarkerFaceColor','red')

set(m(1),'MarkerFaceColor','green')

set(o(1),'MarkerFaceColor','yellow')

%I hope it helps!

[Dean Weems]

Thanks for the assistance.