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#355 Warning for non-polynomial algsys

open
nobody
5
2006-09-09
2003-07-12
No

Solve for multiple variables calls Algsys. As it says
(clearly!) in the documentation, this only works for
polynomial equations.

It would be useful, I think, if we would give a warning
(or an error?) when a non-polynomial equation were
passed to algsys, e.g.

(C1) solve(sqrt(a^2+b^2)=0,[a,b])
Warning: Solve/Algsys can only solve for multiple
variables when the equations are polynomial. The
equation sqrt(a^2+b^2)=0 is not polynomial.

(D1) []

This is a common beginner's error, I think, encouraged of
course by the fact that the command is called "solve" --
you'd think it could solve any simple equation....

Discussion

  • Robert Dodier

    Robert Dodier - 2006-07-07
    • labels: --> 460522
     
  • Robert Dodier

    Robert Dodier - 2006-09-09
    • labels: 460522 --> Lisp Core - Solving equations
     

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