Re: [Maxima-discuss] quaternion algebra and ATENSOR

[Viktor T. T. <vt...@vt...>]

Henry,

The ATENSOR demo actually shows how to work with quaternions in the ATENSOR
package. If you run "demo(tensor);" and select "A;" (or just run
"demo(atensor);") you will see the use of "init_atensor(quaternion);".

You may also try "?? atensor" and read the "Introduction to atensor"
section. It, too, uses quaternions as an example.

For what it's worth, the ATENSOR package is my re-implementation of the
original MACSYMA ATENSOR package using its documentation as specification. I
don't consider this package particularly useful in a practical sense; its
main value is educational.


Viktor



-----Original Message-----
From: Henry Baker [mailto:hb...@pi...] 
Sent: Saturday, June 14, 2014 9:53 AM
To: max...@li...
Subject: [Maxima-discuss] quaternion algebra and ATENSOR

According to the Maxima documentation, the ATENSOR package
is supposed to be capable of representing & simplifying
quaternion expressions.

However, the documentation is too scant to understand how to
do this.

Is there any documentation or examples of using quaternions
in ATENSOR?

I found a paper by Viktor Toth called "Tensor Manipulation in
GPL Maxima", but once again, the details were too sparse to
be able to figure out how to use this package.

Can anyone provide any help?

I'd rather not have to re-invent this particular wheel.

Thanks.


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