Plot in matlab, multiple plots in one figure.

1 次查看（过去 30 天）
Ibrahim
Ibrahim 2015-1-15
评论： Image Analyst 2015-1-15
Hello! I need some help with the following:
Imagine a matrix: N x 3. (an example:
if true
% code
end
___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
end
I tried something like:
for DATA(:,3)==1 %(the datalist called DATA)
plot(x,y,'ro')
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!
ib
  1 个评论
Image Analyst
Image Analyst 2015-1-15
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)?

请先登录，再进行评论。

请先登录，再回答此问题。

采纳的回答

Iain
Iain 2015-1-15
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..
  2 个评论
Image Analyst
Image Analyst 2015-1-15
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.

请先登录，再进行评论。

更多回答（0 个）

类别

在 Help Center 和 File Exchange 中查找有关 Annotations 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by