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The is_cospheric documentation that you get from the help index in Xcas says:

Test if 5 points are on the same sphere.
is_cospheric(Pnt,Pnt,Pnt,Pnt)
is_cospheric([-1,0,0],[1,0,0],[0,1,0],[0,-1,0],[0,0,1])

It states it test five points but the template shows four.
But the bigger issue is that it doesn't evaluate; if I enter

is_cospheric([-1,0,0],[1,0,0],[0,1,0],[0,-1,0],[0,0,1])

in return I get the same thing, unevaluated.

It seems there is a type somewhere, I see is_cospherical in the source. What is the right English word?

I've seen cospherical in English, but not cospheric. So I would say that cospherical is preferable.

The is_cospherical command works as it should, then; it's just that the documentation (including the help index and the command highlighting in Xcas) has is_cospheric.

Jay

Yes. My question was should we keep is_cospheric or is_cospherical?

I would think
is_cospherical
would be better.

and as a suggestion, all is_* commands return the "constant" true/false instead of the numerical values synonymous (1/0) since we are in a symbolic environment

belanger a écrit : ↑

mar. déc. 25, 2018 11:16 pm

I would think
is_cospherical
would be better.

Ok, I'm updating the documentation. Thank you!