在MATLAB中绘制等高线图上的零值 [英] Plot Zero Value on Contour Plot in MATLAB

问题描述

我正在等高线图上绘制0到10的z值.

I'm plotting z values, 0 to 10, on a contour plot.

当我包含1或更大的数据时，我得到了一个等高线图.如下所示:

When I include data 1 or greater, I obtain a contour plot. Like the following:

longitude = [80 82 95]
latitude = [30 32 35]
temp = [1 4 6; 1 2 7; 3 5 7]

contourf(longitude,latitude,temp)

现在，我想在轮廓图上绘制零值.当我期望一种颜色代表零值时，却获得了一个白色正方形.

Now, I want to plot the ZERO VALUE also on the contour plot. While I was expecting one color representing the zero value, instead I obtained a white square.

longitude = [80 82 95]
latitude = [30 32 35]
temp = [0 0 0; 0 0 0; 0 0 0]

contourf(longitude,latitude,temp)

非常感谢， 阿曼达

推荐答案

如Issac所述.在contourf中绘制常量数据是不可能的.

As Issac mentioned. To plot a constant data in a contourf is not possible.

当您尝试这样做时，您将从Matlab获得此警告:

When you try to do so you will obtain this warning from Matlab:

  temp =
   0     0     0
   0     0     0
   0     0     0

  Warning: Contour not rendered for constant ZData 
  > In contourf>parseargs at 458
    In contourf at 63
    In TESTrandom at 45

但是，如果将一些数字设置为0，contourf可以正常工作:

However, if you put some numbers as 0, the contourf works fine:

longitude = [80 82 95];
latitude = [30 32 35];
temp = [0 4 6; 1 0 7; 0 5 9];

contourf(longitude,latitude,temp);
hcb = colorbar('horiz');        % colour bar
set(get(hcb,'Xlabel'),'String','Contourf Bar.')

这篇关于在MATLAB中绘制等高线图上的零值的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！