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Re^4: [OT] Statistics question.

by BillKSmith (Vicar)
on Jan 30, 2013 at 15:25 UTC ( #1016084=note: print w/replies, xml ) Need Help??

in reply to Re^3: [OT] Statistics question.
in thread [OT] Statistics question.

Are your *much* larger numbers perfect squares? If so, you can avoid the problem by factoring into the sum and difference of their square roots.

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Re^5: [OT] Statistics question.
by roboticus (Chancellor) on Jan 30, 2013 at 23:36 UTC


    I was getting ginormous values like 1.6...E30 and the like. Since I'm using exp(...) to generate them, I never have nice integers to play with, so I doubt they form perfect squares or such. But I'm not current on things like that, so I could be wrong.


    When your only tool is a hammer, all problems look like your thumb.

      It sounds like my method will not help you in this case. I have used it in solving triangles. I want $b=sqrt($c**2-$a**2). The mathematically equivalent statement $b=sqrt(($c+$a)*($c-$a)) allocates almost twice as many bits for the subtraction. Not knowing this simple trick added weeks of effort to my first real FORTRAN program.


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