Thread

Re: Re: [HACKERS] random() function produces wrong range

Roland Roberts <roberts@panix.com> — 2000-08-03T17:36:01Z

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>>>>> "Tom" == Tom Lane <tgl@sss.pgh.pa.us> writes:

    Tom> Actually the odds are far better than that.  If the range is
    Tom> 2^31-1 then only about 2^-16th of the outputs should be less
    Tom> than 2^15.  So ten probes gives you a failure probability of
    Tom> about 2^-160 not 2^-10.

Oops, 2^16 != 2^32 / 2.

So a dynamic test is not only possible but wouldn't cost to much at
configure time.

roland
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Roland B. Roberts, PhD                    Unix Software Solutions
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rbroberts@acm.org                          Forest Hills, NY 11375

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