# what matrix.plot meanings?

when I run bolow,a graph appears,how to understand it?

matrix([[3,-1,1],[2,0,1],[1,-1,2]]).plot()

what matrix.plot meanings?

**
asked 2014-10-27 08:56:52 +0200 **

This post is a wiki. Anyone with karma >750 is welcome to improve it.

when I run bolow,a graph appears,how to understand it?

matrix([[3,-1,1],[2,0,1],[1,-1,2]]).plot()

add a comment

3

The *lighter* shades correspond to the *larger* entries of the matrix. In your example the black square are in positions (0, 1) and (2, 1), where the entries are -1, and the white square is in position (0, 0), where the entry is 3, which is the largest entry in the matrix.
Typing

```
sage: M = matrix([[3,-1,1],[2,0,1],[1,-1,2]])
sage: M.plot?
```

will give more information.

0

**
answered 2014-10-28 10:43:34 +0200 **

This post is a wiki. Anyone with karma >750 is welcome to improve it.

thank you ver much!

I have understand by below sage: M = matrix([[20,10,2,-1,1,-2,-10],[20,10,2,-1,1,-2,-10],[20,10,2,-1,1,-2,-10],[20,10,2,-1,1,-2,-10]]) sage: M.plot()

Please start posting anonymously - your entry will be published after you log in or create a new account.

Asked: ** 2014-10-27 08:56:52 +0200 **

Seen: **188 times**

Last updated: **Oct 28 '14**

Copyright Sage, 2010. Some rights reserved under creative commons license. Content on this site is licensed under a Creative Commons Attribution Share Alike 3.0 license.