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[bug-gawk] atan2(y,x) return value for y = 0 and x = -0
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From: |
Hermann Peifer |
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Subject: |
[bug-gawk] atan2(y,x) return value for y = 0 and x = -0 |
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Date: |
Sat, 18 Jan 2014 14:56:19 +0100 |
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User-agent: |
Mozilla/5.0 (Macintosh; Intel Mac OS X 10.9; rv:24.0) Gecko/20100101 Thunderbird/24.2.0 |
Hi,
This might be a feature or a bug, but I thought it would be worth reporting.
# Works as expected
$ awk 'BEGIN{ pi = atan2(0,-0) ; printf "%.16f\n", pi }'
3.1415926535897931
# Why is the result 0 here ?
$ awk -M 'BEGIN{ pi = atan2(0,-0) ; printf "%.16f\n", pi }'
0.0000000000000000
# Works again as expected
$ awk -M 'BEGIN{ pi = atan2(0,-0.1) ; printf "%.16f\n", pi }'
3.1415926535897931
# I used gawk from git on Mac OS X, 10.9.1
$ awk -V | head -1
GNU Awk 4.1.60, API: 1.0 (GNU MPFR 3.1.1-p2, GNU MP 5.1.2)
Hermann