Matlab中的特殊功能 [英] Special functions in Matlab

问题描述

我正在尝试获取如下图片:

I'm trying to get a picture like the following:

http://upload.wikimedia.org/wikipedia/en/e/e6/Airy-3d.svg

我在做什么错了?

[x,y]=meshgrid(-1:.1:1,-1:.1:1);
surf(x,y,(2*besselj(1,2*pi*sqrt(x.^2+ y.^2)/sqrt(x.^2+ y.^2)).^2)

也...有点旁注，但是如果我在这里使用ndgrid而不是meshgrid，则我的x和y会正确切换?

Also... kind of a side note, but if I used ndgrid instead of meshgrid here my x's and y's would switch right?

推荐答案

以下是我认为方程式有误的几件事:

Here are a couple of things I see wrong with the equation:

• 您的方程式中某处缺少缺失的右括号，也许在第一个sqrt(x.^2+y.^2)之后吗?在等式中，看来您是在单独分隔sqrt(x.^2+y.^2)，这可能不是您想要执行的操作，这就是为什么我认为您从那里缺少括号的原因.
• 您可能希望使用./而不是使用/进行矩阵右除(请参见

• There is a missing close parentheses somewhere in your equation, perhaps after the first sqrt(x.^2+y.^2)? In the equation, it appears that you are dividing sqrt(x.^2+y.^2) by itself, which is probably not what you want to do and is why I was thinking you were missing a parentheses from around there.
• You will probably want to perform element-wise division using ./ instead of matrix right division using / (see this link for more detail).

此外，您将需要更改将表面对象的'FaceColor'属性设置为'none'，以便仅显示网格的边缘:

In addition, you will want to change the 'FaceColor' property of the surface object to 'none' so that only the edges of the mesh are displayed:

[x,y] = meshgrid(-1:.1:1,-1:.1:1);
z = ...  %# Compute your z in some way
surf(x,y,z,'FaceColor','none');

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