Jack Brennen on Wed, 24 Apr 2013 01:38:07 +0200 |
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Re: Surprising behaviour of sqrt() on squares of integers |
returns an integer. Both of your examples work fine with sqrtint(): ? Mod(5,sqrtint(9)) Mod(2, 3) ? sqrtint(2^256) 340282366920938463463374607431768211456 ? 2^128 340282366920938463463374607431768211456 On 4/23/2013 4:31 PM, Richard in Reading wrote:
This is just a toy example but there are other real situation where it's annoying that PARI doesn't recognize when you want to take a square root of the square of an integer and return an integer. Is there some justification for this or is it worth me reporting it as a bug. ? Mod(5,sqrt(9)) *** at top-level: Mod(5,sqrt(denominat *** ^-------------------- *** Mod: forbidden division t_INT % t_REAL. *** Break loop: type 'break' to go back to GP ? sqrt(2^256) %17 = 3.4028236692093846346337460743176821146 E38 ? 2^128 %18 = 340282366920938463463374607431768211456 The above should return the same value in my opinion. Richard Heylen