Re: [Axiom-developer] System error: Cannot take first of an empty list

[Martin Rubey]

Of course it's a bug. Please file it!

Martin

Vladimir Bondarenko writes:
 > Hello all,
 > 
 > Any comments on the following stuff?
 > 
 > 
 > .......................................................
 > -- behavior type # 1
 > .......................................................
 > 
 > -> integrate(%i^log(z), z)
 > 
 >         log(%i)log(z)
 >     z %e
 >     -----------------
 >        log(%i) + 1
 > 
 > -> integrate(f^log(z), z)
 > 
 >         log(f)log(z)
 >     z %e
 >     ----------------
 >        log(f) + 1
 > 
 > -> integrate(sin^log(z), z)
 > 
 >         log(sin)log(z)
 >     z %e
 >     ------------------
 >        log(sin) + 1
 > 
 > -> integrate(tan^log(z), z)
 > 
 >         log(tan)log(z)
 >     z %e
 >     ------------------
 >        log(tan) + 1
 > 
 > -> integrate(sqrt^log(z), z)
 > 
 >         log(sqrt)log(z)
 >     z %e
 >     -------------------
 >        log(sqrt) + 1
 > 
 > -> integrate(atan^log(z), z)
 > 
 >         log(atan)log(z)
 >     z %e
 >     -------------------
 >        log(atan) + 1
 > 
 > -> integrate(asinh^log(z), z)
 > 
 >         log(asinh)log(z)
 >     z %e
 >     --------------------
 >        log(asinh) + 1
 > .......................................................
 > 
 > 
 > BUT
 > 
 > 
 > .......................................................
 > -- behavior type # 2
 > .......................................................
 > 
 > -> integrate(exp^log(z), z)
 > 
 >    >> System error:
 >    Cannot take first of an empty list
 > 
 > -> integrate(log^log(z), z)
 > 
 >    >> System error:
 >    Cannot take first of an empty list
 > 
 > .......................................................
 > 
 > 
 > Should this be considered as a bug or a feature?
 >    
 > 
 > Best,
 > 
 > Vladimir
 > 
 > 
 > 
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