How do I generate a 5x5 plot using pcolor?

Question

Joe M 2012-4-2

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/34212-how-do-i-generate-a-5x5-plot-using-pcolor

Good evening!

I have a problem: I want to produce a 5x5 grid image plot of black and white cells. The following code only produces a 4x4 grid of cells, even though the matrix A is a 5x5. Can someone please identify what I'm doing wrong?

clear;clc
A = [0 0 0 0 0;
     0 0 0 0 0;
     0 0 1 1 0;
     0 0 0 0 0;
     0 0 0 0 0];
mymap = [1 1 1;
         0 0 0];
pcolor(A)
colormap(mymap)
axis square

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Honglei Chen 2012-4-2

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/34212-how-do-i-generate-a-5x5-plot-using-pcolor#answer_42897

在 MATLAB Online 中打开

Just use

A =[0 0 0 0 0 0;
0 0 0 0 0;
0 0 1 1 0;
0 0 0 0 0;
0 0 0 0 0;
0 0 0 0 0];

pcolor uses the entries in A as the four corners of the cell, as explained in the doc

http://www.mathworks.com/help/techdoc/ref/pcolor.html

3 个评论
显示 1更早的评论隐藏 1更早的评论

Honglei Chen 2012-4-2

Do you have to use pcolor? How about imagesc? It does not have the grid lines but I don't know if that's critical to you.

Walter Roberson 2012-4-2

imagesc() and turn the axis grid on if you need it.

Honglei is correct, pcolor _always_ outputs a smaller color matrix than its input matrix. imagesc() and image() and imshow() output the same size grid as their input. imagesc() always automatically scales the data to the available output color range, and imshow() has a simple option to do that, but image() does not scale the data.

请先登录，再进行评论。