Unidentified subject!

[krizovah]

Good afternoon,

I've got a problem calculating "acosh". I have to calculate cosh^(-1) of a very
large complex number (-7.2718e+15 + 1.3382e+15i). If I try to calculate the
value of acosh on the command line of octave, the result is "Inf". If I've got
the same in a script, the script apparently uses this "result" for further
calculations and   I'm very suspicious about the output from this script. Is
there a limit for the value that one can use when evaluating acosh???

Thanks,

Hana. 

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