Re: Roots

Posted by Rich Ulrich on Nov 15, 2019; 5:05pm
URL: http://spssx-discussion.165.s1.nabble.com/Roots-tp5738554p5738559.html

I wonder - Is there any demand for the exception-coding

that would be necessary?  How many people write code

where they want to take the fractional root of a negative

number, where the fraction is the reciprocal of an odd integer?

( Note, the fraction cannot be expressed EXACTLY on a binary

computer. How is that accommodated?)

The natural programming solution to non-integer roots is

to use logs.  I suppose if there is an area where the problem

comes up, specialized programs for that area might do it.

I suspect the efficient solution might use a special subroutine

call rather than an in-line expression.

--

Rich Ulrich

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From: SPSSX(r) Discussion <[hidden email]> on behalf of Bruce Weaver <[hidden email]>
Sent: Friday, November 15, 2019 11:35 AM
To: [hidden email] <[hidden email]>
Subject: Re: Roots

 

https://www.ibm.com/support/knowledgecenter/en/SSLVMB_26.0.0/statistics_reference_project_ddita/spss/base/syn_transformation_expressions_domain_errors.html



Kirill Orlov wrote
> See DOMAIN ERRORS paragraph in Command Syntax Reference.
>
>
> 15.11.2019 4:53, Stan Gorodenski пишет:
>> compute z = (-1)**(1/3).
>
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