Using the 'Surf' command for variable 'x' values

Question

Siddharth Gopujkar 2019-3-22

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链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/451820-using-the-surf-command-for-variable-x-values

评论： Star Strider 2019-3-23

采纳的回答： Star Strider

I am trying to use the Surf command. Here's the data that I have:

x= [1.158633 4.871195 7.667851 11.45038 22.11895

1.221922 3.777088 7.641091 11.52413 21.89302

1.52861 4.609719 7.60228 12.06438 21.33681

1.934019 6.881875 9.591649 13.51807 21.30859 ];

y=[0 12.5 25 37.5];

[xx, yy]=meshgrid(x, y)

zz=[ 0.000522 0.000549 0.000557 0.000623 0.000222

0.000584 0.000476 0.000566 0.00062 0.000194

0.000557 0.000528 0.00065 0.000594 0.000144

0.000603 0.000514 0.000588 0.000606 0.000206 ];

The problem is, the 'y' value is the same for every 4 points in the zz matrix but the x value differs. Because of that, surf doesn't work. If all x values were something like [1.5 5 8 12 21], it would work perfectly. But they differ a little. Any suggestions what I can do?

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Answer 1

Star Strider 2019-3-23

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/451820-using-the-surf-command-for-variable-x-values#answer_366924

在 MATLAB Online 中打开

It doesn’t work because ‘y’ is a vector.

Try this:

x=  [1.158633  4.871195  7.667851  11.45038  22.11895 
  1.221922  3.777088  7.641091  11.52413  21.89302 
  1.52861  4.609719  7.60228  12.06438  21.33681 
  1.934019  6.881875  9.591649  13.51807  21.30859 ];
y=[0 12.5 25 37.5];
yy = repmat(y, size(x,2), 1)';
zz=[ 0.000522  0.000549  0.000557  0.000623  0.000222 
  0.000584  0.000476  0.000566  0.00062  0.000194 
  0.000557  0.000528  0.00065  0.000594  0.000144 
  0.000603  0.000514  0.000588  0.000606  0.000206 ];
figure
surf(x, yy, zz)
grid on