Contour plots in terms of 3 variables

Question

Keith 2012-2-10

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/28690-contour-plots-in-terms-of-3-variables

编辑： Roger Stafford 2013-10-10

Hi all - I hope someone can help me.

I have three data sets:

wind speed
wind direction
error.

What I'd like to do is to create a contour plot that shows values of error in terms of the wind speed and direction - in so far that the diagram will illustrate where the greater values of error are with respect to both wind speeds and direction. Can any one help??

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

bym 2012-2-12

perhaps you will want to investigate meshgrid()

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

the cyclist 2012-2-10

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/28690-contour-plots-in-terms-of-3-variables#answer_37048

Use the contour() function. Type "doc contour" into MATLAB for details.

5 个评论
显示 3更早的评论隐藏 3更早的评论

Keith 2012-2-14

Hi cyclist - that appears to work - although to be honest, it doesn't produce the contoured illustration I desire. The code::

load Error_No_Filter.txt

X=Error_No_Filter(:,1)

Y=Error_No_Filter(:,2)

Z=Error_No_Filter(:,3)

F.Method = 'nearest';

F = TriScatteredInterp(X, Y, Z);

x_axis = 0:1:15;

y_axis = 0:10:360;

[qx,qy] = meshgrid(x_axis,y_axis);

qz = F(qx,qy);

mesh(qx,qy,qz); hold on; contour3(X,Y,Z);

xlabel('Wind Speed [m/s]', 'fontweight','b'), ylabel('Wind Direction [deg]','fontweight','b')

zlabel('error', 'fontweight','b')

title('Interpolated error in terms of wind speed & direction', 'fontweight','b');

From the above, do you have any suggestions that can facilitate turning the above into a contour illlustration that also illustrates the values of the associated cotours?

Thanks,

KEith

the cyclist 2012-2-14

I think what you want is the colorbar command. Just run that command after your code.

请先登录，再进行评论。

Answer 2

Image Analyst 2012-2-12

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/28690-contour-plots-in-terms-of-3-variables#answer_37178

Why not use TriScatteredInterp() to turn your set of (x,y,z) triplets into an image, and display it as an image? That would probably be an insightful visualization and allow you to see patterns. Or you can do a surface plot. There's a nice demo for that in the help for TriScatteredInterp().