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Fix error in Power#e2ApfloatArg() method numerical high precision evaluation #207

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axkr opened this issue Dec 9, 2020 · 2 comments
Closed

Fix error in Power#e2ApfloatArg() method numerical high precision evaluation #207

axkr opened this issue Dec 9, 2020 · 2 comments

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@axkr
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axkr commented Dec 9, 2020 •
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Fix error in Power#e2ApfloatArg() method numerical high precision evaluation

ArithmeticException: "Power of negative number; result would be complex" is thrown

See: #206
axkr added a commit that referenced this issue Dec 9, 2020
@axkr
#207
aac80f0 
- Fix error in Power#e2ApfloatArg() method numerical high precision
evaluation
- #206
@tranleduy2000
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Using this implementation will reduce the accuracy of apfloat number.
Example:

N[((2)/(3))*(4-3*Sqrt(2)), 100]

Old version: -0.161760458079523430936710781752729490472677084087229479686692809...
Wolfram:     -0.161760458079523430936710781752729490472677084087229479686692809...

New version: -0.161760458079523192529178585472335853284324913396796799718432944...
                               ^

@axkr
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axkr commented Dec 12, 2020

Cannot reproduce in current version (line 21114)
https://github.com/axkr/symja_android_library/blob/master/symja_android_library/matheclipse-io/src/test/java/org/matheclipse/io/system/LowercaseTestCase.java

tranleduy2000 added a commit to tranleduy2000/symja_android_library that referenced this issue Dec 14, 2020
@tranleduy2000
axkr#207 axexlck Today 12:26 am
2cef822
@axkr axkr closed this as completed Sep 18, 2021
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@axkr @tranleduy2000