How do I assign a matrix column as my x or y values so that can plot them?

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aforden
aforden 2013-3-30
I'm not having any errors I just honestly don't know the commands. Thanks!

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回答（2 个）

Walter Roberson
Walter Roberson 2013-3-30
x = YourMatrix(:, TheColumnNumber);
For example,
data = rand(64, 15);
x = data(:,11); %column 11
y = data(:,3);
plot(x,y);
Ahmed A. Selman
Ahmed A. Selman 2013-3-30
Use the basic matrix notation, the colon operator is very helpful in such cases. Example:
y=magic(5)
y =
17 24 1 8 15
23 5 7 14 16
4 6 13 20 22
10 12 19 21 3
11 18 25 2 9
To plot the first row only:
plot(y(1,:))
To plot rows from the first to the third:
plot(y(1:3,:))
To plot columns 1 and 4:
plot(y(:,[1,4])) ... etc.
If you want to plot x and y axes specifically, use plot(x,y). As in:
x=-pi:0.1:pi;
y=sin(x);
plot(y) % this plots from 0 to 2 pi on the x-axis
plot(x,y) % this plots from -pi to pi.. etc.

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