How to get 3 plots on the same graph using the same axes?

[bluemood]

Hello there,

I am a beginner on MATLAB. Facing problem to get 3 plots using the same axes. Hope my note is understandable .....

Here's the scenerio.

I have 3 column vectors of same certain length - A, B, C. C contains 3 discrete values - aa, bb, cc. At any one time, aa, bb, cc can have the same A & B.

I want to compare the 3 different values of C by different colours on the same graph with A & B as the x-y axes.

Using plot(A, B, 'r*') can give me what I required but w/o the 3 different colours of C.

Can someone help me on this?

Many thanks in advance!

 

[Lewish]

plot(A,B,aa,'r*') % plot will be red

hold on % allows adding overplots

plot(A,B,bb,'b*') % plot will be blue
plot(A,B,cc,'c*') % plot will be cyan

 

[bluemood]

Thanks, Lewish.

I put in the aa value but the command won't work.

??? Error using ==> plot
String argument is an unknown option.

Error in ==> D:\csv1.m
On line 21 ==> plot(c, s, 0, 'r*');

 

[Lewish]

Oops, I misread part of your post. I incorrectly assumed that aa was a separate value set to C at some time, then bb, etc.

What I need to know, to be of further help, is how are aa, bb, and cc contained in C? Are they as an array or as a struct?

Figure out how to access those values, and then replace that addressing with the aa, bb, and cc in the previous example. Then you should get your plot.

 

[bluemood]

Hi Lewish,

Thanks so much for your help.

aa, bb, cc is stored as array.

Took me quite a while and I managed to access aa, bb, cc. I sort them out and plot them by calling aa to plot with A & B, calling bb to plot with A & B and so on... with hold on. This way, I get the aa, bb, cc to plot on the same A & B axes.