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Missing factor root test


From: Christian Wacker
Subject: Missing factor root test
Date: Wed, 17 Mar 2021 16:08:56 +0100
User-agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.8.1

Hello,

the derivative of the function func2 = sqrt(abs(x)) * sgn(x) in roots/test_funcs.c is stated to be 1 / sqrt(abs(x)). So it seems that there is a factor of 0.5 missing.

Best regard
Christian



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