CAS: (2^10)! is undefined?

[parisse]

(10-27-2018 07:59 PM)sasa Wrote:  Also there is no difference in logic regarding handling operation failures, thus IEEE-754 is quite valid reference. It show basic you have to consider in order to avoid problems as reported.

You probably think so because your experience with coding CAS seems rather limited:

Quote:It was a toy, yes, made for fun only as a challenge to spare time for mainly symbolic higher order derivation and desired 2D and 3D graph displaying, but what was capable to do was done properly and fast.

Computation of limits, integrals, solution of differential equations, solving in general as well as simplifications of expressions with algebraic relations between variables or some linear/polynomial algebra is much more complicated, especially if you want to be efficient.

Quote:And the last unexpected result I have found in Prime was:
limit(x/ABS(x),x,0) => 0 ?!? (including limit from left and right)

As reported by other users, I can not reproduce this, I get correct answers. There are probably still bugs in limit or other complex algorithms, but since Giac is also used by Geogebra, I expect they will appear for more unusual inputs.

Quote:At end, if you treat all as personal attacks, it is really no point to waste more time on this. It is anyway up to you what to do. If you, HP and customers are happy with current state, there is no point for evidence of any bug existence...

Actually, when someone is only posting to say "Ha! this CAS does not even simplify this properly" or "this CAS does not return the expected result for that", etc. and pretend he knows better than me how to code CAS software because he wrote some symbolic code in the past, shoud I react by asking "Great, send me more?"