网格函数似乎交换x和y值

问题描述

我试图在3d平面上绘制一个非常简单的函数.

I am trying to plot a very simple function in the 3d plane.

f=zeros(101,101);
xs=0:0.1:10;
ys=0:0.1:10;

for j=1:101
    f(1,j)=ys(j);
end

这是3个地块:

第一个是ymin时f vs x的图:

The first is a plot of f vs x at ymin:

figure; plot(xs,f(:,1),'*r')
xlabel('x')
ylabel('f')

第二个是xmin时f vs y的图:

The second is a plot of f vs y at xmin:

figure; plot(ys,f(1,:),'*r')
xlabel('y')
ylabel('f')

最后，第三个是3d网格:

And finally the third is a 3d mesh:

figure; mesh(xs,ys,f)
xlabel('x')
ylabel('y')

但是，网格图似乎与2 2d图相矛盾，如果让我知道，x和y似乎会切换.有人可以帮忙吗?出于某种原因，它应该是mesh(ys，xs，f)吗?谢谢！

However the mesh plot seems to contradict the 2 2d plots, it seems to have the x and y switched around if you get me. Can anyone help? Should it be mesh(ys,xs,f) for some reason? Thanks!

推荐答案

mesh并未切换您的x和y，这只是定义问题.不要忘记矩阵没有x轴或y轴，而是具有行维和列维.行尺寸通常像x一样成对出现，但是如果也将其等同于图像，则通常会使x轴穿过，实际上是沿列轴！

mesh didn't switch your x and y, it's a matter of definition. Don't forget that a matrix doesn't have an x axis or a y axis but rather a row dimension and a column dimension. The row dimension is normally stated first in a pair just like the x dimension but if you are equating it too an image then you would normally have the x axis going across which is actually along the column axis!

宁愿这样尝试

for j=1:101
    f(j,1)=ys(j);
end

figure; plot(xs,f(1,:),'*r')
xlabel('x')
ylabel('f')

figure; plot(ys,f(:,1),'*r')
xlabel('y')
ylabel('f')

figure; mesh(xs,ys,f)
xlabel('x')
ylabel('y')

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