Nasser M. Abbasi wrote:
>
> Any idea what causes this crash?
>
> (1) ->
> integrand:=1/2*2^(1/2)*1/(1+x)^2/(-%i+x^2)^(1/2)+1/2/(1+x)^2*2^(1/2)/(%i+x^2)^(1/2)
>
> *** - Program stack overflow. RESET
>
> [/build/buildd/clisp-2.49/src/eval.d:573] reset() found no driver frame
> (sp=0x7fff69c09460-0x7fff69c03400)
> Exiting on signal 6
At first FriCAS tries to assign type to your expression and this
process fails. Type assignment in FriCAS is based on heuristics
and your input is in unexpected style and triggers a bug.
The following works:
integrand:=(1/2*2^(1/2)*1/(1+x)^2/(-%i+x^2)^(1/2)+1/2/(1+x)^2*2^(1/2)/(%i+x^2)^(1/2))@Expression(Complex(Integer))
+-------+ +-------+
+-+ | 2 +-+ | 2
\|2 \|x + %i + \|2 \|x - %i
(5) ------------------------------------
+-------+ +-------+
2 | 2 | 2
(2 x + 4 x + 2)\|x - %i \|x + %i
Type: Expression(Complex(Integer))
(the @Expression(Complex(Integer)) part tells FriCAS what type to use.
Alternatively you can try to rearrage expression (but IIUC this is not
an option to you). Also, using 'sqrt(-1)' instead of '%i' reduces
problem (no crash but FriCAS can not find reasonable type).
--
Waldek Hebisch
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