Incorrect result for -ln(x) about mate-calc HOT 12 CLOSED

This package is discontinued after 1.8.
http://mate-desktop.com/blog/2014-03-17-galculator-is-coming-to-mate/

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mate-calc is resurrected.

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@maandree please can you explain better the issue?

we need to reproduce the issue step by step:

• expected behavior

• actual behavior

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expected behavior

-ln(1) = -1 x ln(1) = -1 x 0 = 0. ln(1)=0, e^0=1
-ln(e) = -1 x ln(e) = -1 x 1 = -1. ln(e)=1, e^1=e
1-ln(e) = 1 - 1 = 0

actual behavior

-ln(1) = 3.141592654i. e^3.141592654i = -1
-ln(e) = 1+3.141592654i. e^(1+3.141592654i) = -e
1-ln(e) = 2.151×10⁻³⁹⁷

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@rbuj which mate-calc version did you test that values?

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latest build from master
https://gist.github.com/rbuj/bc62164be10a7290f5213c47711c7998#file-test-mate-desktop-sh

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ok, with mate-calc 1.20.3 the values are different (not sure, probably b0e4fe2 makes the difference)

mate-calc 1.20.3

-ln(1) = 3.141592654i
-ln(e) = 1+3.141592654i
1-ln(e) = 0

gnome-calculator 3.30.1

-ln(1) = 0
-ln(e) = -1
1-ln(e) = 0

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@rbuj these are the expected values?

-ln(1) = 1
-ln(e) = e
1-ln(e) = 0

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@sc0w

-ln(1) = 0
-ln(e) = -1
1-ln(e) = 0

Formula

ln(x) = y
e^y = x

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ok, my tests:

gnome-calculator versions:

3.10.0 it works as expected

3.8.2 shows the same wrong values as mate-calc 1.20.3

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I think it was fixed by this commit: https://gitlab.gnome.org/GNOME/gnome-calculator/commit/917fafcb062412c66230bde4cfed5437ba0da235

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For example, these test cases from the commit still do not work in mate-calc:

    test ("1 + 2 - 3 * 4 / 5", "0.6", 0);
    test ("10 mod 4 / 2", "1", 0);
    test ("20 / 10 mod 3", "2", 0);
    test ("12 / 3 √4", "8", 0);
    test ("√5!", "10.95445115", 0);
    test ("4 ^ sin 30", "2", 0);
    test ("4 ^ (sin 30)", "2", 0);
    test ("4 ^ sin (30)", "2", 0);
    test ("sin (30) ^ 4", "0.0625", 0);
    test ("sin 30 ^ 4", "0.0625", 0);
    test ("sin (30 ^ 4)", "0", 0);

At least the ones when there are missing brackets do not work.

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