"patch" command error

Question

kai 2019-5-17

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/462614-patch-command-error

评论： Rik 2019-5-18

采纳的回答： Rik

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mac -OS

MATLAB version-2018a

I have two matrices one with vertices-(280×3) and the other one with faces-(556×3) .

Using patch command as follows

P=patch('Faces',f11,'Vertices',k1);   %%%%%f11= face matrix and k1=vertex matrix.
set(P,'FaceColor','b','FaceAlpha',0.5);
set(P,'EdgeColor','k','LineWidth',2);

It gives the following error

Error using patch

Value must be of numeric type and greater than 1

Attached are the two files containing the matrices.

Any suggestions on how to eliminate this problem

Thanks.

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Answer 1

Rik 2019-5-17

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I suspect you generated the vertex IDs in a programming language that is zero-indexed, instead of one-indexed. If that is the case you can probably fix the issue like this:

P=patch('Faces',1+f11,'Vertices',k1);   %%%%%f11= face matrix and k1=vertex matrix.
set(P,'FaceColor','b','FaceAlpha',0.5);
set(P,'EdgeColor','k','LineWidth',2);

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kai 2019-5-18

Thank you Rik for the answer, now it works fine.

Just curious.. How did you came to a conclusion that vertex IDs generated are zero indexed.

Rik 2019-5-18

You're welcome.

I assumed they weren't generated by Matlab, and most other programming languages are zero indexed. So it was an educated guess. And generally the first few faces will contain the first vertex, but in the txt there were a few zeros where I expected ones.

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