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mod doesn't work wery well   Message List  
Reply | Forward Message #58 of 114 |
Re: [wcalc] mod doesn't work wery well

Perhaps I found another bug in the mod operator, I don't know if the
result change with the last modifies to the way the mod works, so ..
For `m % n' where `m' is multiple of `n' wcalc returns `n' instead of `0',
I think this isn't correct, is it?

$ wcalc '30%10'
= 10

Cheers,
Daniele

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A complex system that works is invariably found to have evolved from a
simple system that works.
Wed Jul 5, 2006 3:39 pm

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scrows@...
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Forward 		Message #58 of 114 |
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I wanted the remainder of a division with big numbers, this is what I've done: $ time wcalc "2^56 - floor(2^56 / 57)*57" = 4 real 0m0.004s user 0m0.001s ... 		Daniele
scrows@...
Send Email 		Jun 28, 2006
10:15 am

... Heh, right. Counting up to 2^56 in 57-steps might take a while. ;-) ... Sure. Patch attached. Cheers, Ingo...
Ingo van Lil
ingo_swt
Offline Send Email 		Jun 28, 2006
6:30 pm

... Hmm. What is currently in CVS is this: mpfr_set_ui(temp, 0, GMP_RNDN); mpfr_div(temp, first, second, GMP_RNDN); mpfr_rint(temp, temp, GMP_RNDZ); ...
Kyle Wheeler
m3m0ryh0l3
Offline Send Email 		Jun 29, 2006
4:18 am

... What's the first line good for? ... -20 is not an option. The question is: When performing the integer division of -340 and 60, do you round the result by...
Ingo van Lil
ingo_swt
Offline Send Email 		Jun 29, 2006
8:03 am

... Hmm, not much, come to think of it. ... Hmm, well, I tend to like not being restrictive, and I also like maintaining the existing behavior. In Wcalc 1.x,...
Kyle Wheeler
m3m0ryh0l3
Offline Send Email 		Jun 29, 2006
9:35 pm

... Actually, if I'm reading the ADA reference manual correctly, the REM operator does exactly what your algorithm does (A REM B keeps the sign of A) while the...
Ingo van Lil
ingo_swt
Offline Send Email 		Jun 29, 2006
11:05 pm

... Well, I'm not saying I'm in love with ADA, I'm just suggesting we preserve the existing behavior for % and do a better/different one with a new operator...
Kyle Wheeler
m3m0ryh0l3
Offline Send Email 		Jun 30, 2006
1:23 am

... Well, rounding output towards zero would pick floor() or ceil() depending on the sign of output. I'm checking the sign of the first operand instead. So, if...
Ingo van Lil
ingo_swt
Offline Send Email 		Jun 30, 2006
8:35 am

Perhaps I found another bug in the mod operator, I don't know if the result change with the last modifies to the way the mod works, so .. For `m % n' where `m'...
Daniele
scrows@...
Send Email 		Jul 5, 2006
3:35 pm

... Nope, that's wrong. Looks like I need to get this fixed version out asap. ~Kyle -- It is easier to be critical than to be correct. -- Benjamin Disraeli...
Kyle Wheeler
m3m0ryh0l3
Offline Send Email 		Jul 6, 2006
7:01 am
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