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[MUG] BasisFormat display bug
| [MUG] BasisFormat display bug |
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Author: Crystal Johnson
Posted: Tue, 25 Jun 2002 16:31:39 GMT
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>> From: "Crystal Johnson" />
"with(VectorCalculus)", the vectors are displayed in "BasisFormat", which means the components are written as a linear combination of basis vectors. There is a confirmed bug with the display when the first component(s) is(are) zero, and the next component is -1. I'll just show it:
> < 0,-1,0 >;
the result is displayed incorrectly as e[y].
> 2*%;
the result is correctly displayed as (-2)e[y].
Similarly:
> < 0,0,-1 >;
e[z]
> 2*%
(-2)e[z]
Watch out for it in results, because it could be quite misleading. A way to work around it is to turn off the basis format option:
> BasisFormat(false);
Or (as I'd be more inclined to do) just do a verification on any results of the "possibly-erroneous form" <0,0,..,1,..> by multiplying by "1." before making note of the result.
Just thought you'd like to be warned :)
Crystal
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