Matlab绘制点并显示值 [英] Matlab drawing points and show values

问题描述

我有一个简单的情节问题.

在x轴上，值是K，例如从2到12，是离散的. 在y轴上，值是C，例如从1到10，是离散的.

我的功能是分段的:

如果K ＜2C，则＜p；如果K ＜2C，则为p. 如果K> = 2C，则K + 2C;

我想显示(K，C)点的值:

(1,1)显示为1 (1,2)显示为1 (2,1)显示为4 (2,2)显示为2

我该怎么做?

非常感谢，

Casper

解决方案

您可以使用 ndgrid 创建K和C:

[K C] = ndgrid(2:12,1:10);

然后使用逻辑索引来计算各个部分:

z=zeros(11,10);
ind = K>=(2*C);
z(~ind) = K(~ind);
z(ind) = K(ind)+2*C(ind);

然后按照您想要的方式绘制:

surf(C,K,z);

或

image(z);

和其他人......

I have a simple plot question.

On x axis, the values are K, say from 2 to 12, discrete. On y axis, the values are C, say from 1 to 10, discrete.

My function is piecewise:

K if K<2C; K+2C if K>=2C;

I want to show the values at points (K,C):

(1,1) Show as 1 (1,2) Show as 1 (2,1) Show as 4 (2,2) Show as 2 ect.

How would I do that?

Many thanks,

Casper

解决方案

You can use ndgrid to create K and C:

[K C] = ndgrid(2:12,1:10);

then use logical indexing to calculate the separate parts:

z=zeros(11,10);
ind = K>=(2*C);
z(~ind) = K(~ind);
z(ind) = K(ind)+2*C(ind);

then plot any way you want:

surf(C,K,z);

or

image(z);

and others....

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