Plot in matlab, multiple plots in one figure.

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Hello! I need some help with the following:
Imagine a matrix: N x 3. (an example:
if true
% code
___x___ |___y___|__Z__|
1 | 2 | 1 |
2 | 3 | 2 |
3 | 2 | 3 |
4 | 2 | 4 |
2 | 3 | 1 |
7 | 4 | 2 |
8 | 2 | 3 |
8 | 2 | 4 |
3 | 4 | 1 |
And the matrix is defined by a data list.
THE QUESTION: we want to plot the (x,y) values, for each Z value in the same coordinate system. Also we need to make it possible to see a difference between them.
I figured out the how to change the color, marking etc.
But i DO NOT know how to plot for Z = 1, Z = 2. ?
if true
% code
I tried something like:
for DATA(:,3)==1 %(the datalist called DATA)
hold on
for DATA(:,3)==2; plot(x,y,'dk') hold on etc.
but it doesn't Work! I have checked my matlab book, Google, etc. with no results! I will appreciate your help! thanks!
  1 Comment
Image Analyst
Image Analyst on 15 Jan 2015
Are the Z all definitely integers, or can they have fractional values (in which case you'll need to bin them with hist())? And what is the "data list"? Is that what you somehow used to create the matrix of x,y,z values? Does it matter what it is, or can we just take the x,y,z matrix as a given (a starting point)?

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Accepted Answer

Iain on 15 Jan 2015
x_for_z1 = matrix(matrix(:,3)==1,1);
y_for_z1 = matrix(matrix(:,3)==1,2);
plot(x_for_z1,y_for_z1,'r') hold on etc etc..
Image Analyst
Image Analyst on 15 Jan 2015
Note: this will not work if Z has fractional values like 2.0001 and 3.9999. See the FAQ. It will work for integers though. However you may want to do it for all Z in which case you'll want to call unique() and put lain's code into a for loop.

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