Numpy complex numbers division bug on Win 10 #47363

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Ricky J · 2016-02-08T17:08:00+01:00

Ricky J commented

2016-02-08 17:08:00 +01:00

Win 8.1 / 64 bits
AMD A10-6700 APU
video : HD8670 D

Hash = b'f337fea' 8 Fev 2016
and also

Hash = b'f77110e'

I asked someone else to test this on Linux
and it seems to work fine

so this seems to be a bug on Win 10

in given file there is a problem with this division of complexx numbers in Numpy

z1 = 7.49+0.71j
z2 = 127.01705922171767+0j
z3 = z2/z1
print ('z1 =',z1)
print ('z1 abs =',np.absolute(z1),' z1 ang =',np.angle(z1, deg=True),' Deg')
print ('z2 =',z2)
print ('z2 abs =',np.absolute(z2),' z2 ang =',np.angle(z2, deg=True),' Deg')
print ('z2/z1 = z3 =',z3)

the angle for Z3 gives -174 degrees

but it should be around -5 degrees !

tested other values and seems to work but not for this division operation.

see thread discussing this

http://blenderartists.org/forum/showthread.php?392066-numpy-complex-division-error

divide-test1.blend

thanks
happy bl

Win 8.1 / 64 bits AMD A10-6700 APU video : HD8670 D Hash = b'f337fea' 8 Fev 2016 and also Hash = b'f77110e' I asked someone else to test this on Linux and it seems to work fine so this seems to be a bug on Win 10 in given file there is a problem with this division of complexx numbers in Numpy z1 = 7.49+0.71j z2 = 127.01705922171767+0j z3 = z2/z1 print ('z1 =',z1) print ('z1 abs =',np.absolute(z1),' z1 ang =',np.angle(z1, deg=True),' Deg') print ('z2 =',z2) print ('z2 abs =',np.absolute(z2),' z2 ang =',np.angle(z2, deg=True),' Deg') print ('z2/z1 = z3 =',z3) the angle for Z3 gives -174 degrees but it should be around -5 degrees ! tested other values and seems to work but not for this division operation. see thread discussing this http://blenderartists.org/forum/showthread.php?392066-numpy-complex-division-error [divide-test1.blend](https://archive.blender.org/developer/F280936/divide-test1.blend) thanks happy bl

Ricky J commented

2016-02-08 17:08:00 +01:00

Changed status to: 'Open'

Ricky J commented

2016-02-08 17:08:00 +01:00

Added subscriber: @rickyblender

Bastien Montagne commented

2016-02-08 19:31:30 +01:00

Added subscriber: @mont29

Bastien Montagne commented

2016-02-08 19:31:30 +01:00

This seems to be an issue with numpy itself… Did you try that directly from python console itself (without using Blender at all)?

Ricky J commented

2016-02-09 00:09:41 +01:00

trying to do it in winpython

but I asked some one else to test it in Linux blender
and it works fine

but not on win 10

thanks
happy bl

trying to do it in winpython but I asked some one else to test it in Linux blender and it works fine but not on win 10 thanks happy bl

Ricky J commented

2016-02-09 00:43:41 +01:00

just did a test in winpython
and it works fine

I get the right angle at around 5 degrees

so guess it has something to do with bl some how

thanks
happy bl

just did a test in winpython and it works fine I get the right angle at around 5 degrees so guess it has something to do with bl some how thanks happy bl

Bastien Montagne commented

2016-02-09 13:19:28 +01:00

Added subscriber: @MartijnBerger

Bastien Montagne commented

2016-02-09 13:19:28 +01:00

@MartijnBerger maybe we should use latest version of numpy for windows? We are using 1.9 afaik, according to numpy release notes they are using more and more C99 builtin complex support, this could explain the issue?

@rickyblender which is the exact version of numpy you used to test outside of Blender?

@MartijnBerger maybe we should use latest version of numpy for windows? We are using 1.9 afaik, according to [numpy release notes](http://docs.scipy.org/doc/numpy-1.10.1/release.html) they are using more and more C99 builtin complex support, this could explain the issue? @rickyblender which is the exact version of numpy you used to test outside of Blender?

Ricky J commented

2016-02-09 15:49:00 +01:00

I have an old Python installed on my machine but not Numpy

so got Winpython
http://winpython.sourceforge.net/
winpython 64 bits 3.4.3.7 python 3.4.3 AMD

which has most of the package including Matplot

wish I could have same things in BL
so only way for me to test it was to use Iptyhon
and it works fine

Also Eppo did a test on Linux and it also work fine

Looks like it is only on Win 64 that it does not work well
for some specific cases of values for the complex angle.

Did anyone else find the same error on Win 64 ?

thanks
happy bl

I have an old Python installed on my machine but not Numpy so got Winpython http://winpython.sourceforge.net/ winpython 64 bits 3.4.3.7 python 3.4.3 AMD which has most of the package including Matplot wish I could have same things in BL so only way for me to test it was to use Iptyhon and it works fine Also Eppo did a test on Linux and it also work fine Looks like it is only on Win 64 that it does not work well for some specific cases of values for the complex angle. Did anyone else find the same error on Win 64 ? thanks happy bl

Martijn Berger was assigned by Bastien Montagne

2016-02-09 16:28:04 +01:00

Bastien Montagne commented

2016-02-09 16:28:04 +01:00

well… winpython 3.4.3.7 reports numpy 1.9.3… (https://github.com/winpython/winpython/blob/master/changelogs/WinPython-3.4.3.7.md).

Will let @MartijnBerger handle it from there, could be some bug in our version of numpy but cannot check that here.

well… winpython 3.4.3.7 reports numpy 1.9.3… (https://github.com/winpython/winpython/blob/master/changelogs/WinPython-3.4.3.7.md). Will let @MartijnBerger handle it from there, could be some bug in our version of numpy but cannot check that here.

Brecht Van Lommel commented

2016-02-10 19:51:48 +01:00

Added subscriber: @brecht

Brecht Van Lommel commented

2016-02-10 19:51:48 +01:00

I don't think Numpy has anything to do with this, the code in the description only uses Python's builtin complex numbers.

Ricky J commented

2016-02-26 19:35:11 +01:00

I was talking about these

print ('numpy z3 abs =',np.absolute(z3),'z3 ang =',np.angle(z3, deg=True),' Deg')
print ('numpy angle =', rad2deg(angle(z3)) )

this is using np or numpy values if i'm not mistaking !

ang =',np.angle(z3, deg=True )

that is the one that does not work giving -171 Deg instead of
ang = -0.09451065035724213 Rad -5.41506138450656 deg

some other equations seems to work so not certain what error it can be

you can remove the cmath module at top not beeing use anyway
it will still give same error !

how is it not using np ?

thanks
happy bl

I was talking about these print ('numpy z3 abs =',np.absolute(z3),'z3 ang =',np.angle(z3, deg=True),' Deg') print ('numpy angle =', rad2deg(angle(z3)) ) this is using np or numpy values if i'm not mistaking ! **ang =',np.angle(z3, deg=True )** that is the one that does not work giving -171 Deg instead of ang = -0.09451065035724213 Rad -5.41506138450656 deg some other equations seems to work so not certain what error it can be you can remove the cmath module at top not beeing use anyway it will still give same error ! how is it not using np ? thanks happy bl

Attila G commented

2016-03-01 20:25:40 +01:00

Added subscriber: @Symmetric-3

Attila G commented

2016-03-01 20:25:40 +01:00

I can confirm the issue. While it works fine on my Linux Mint 17.2 64 bit, I have the exact same problem on Windows 7 64 bit (same computer)

I'm using blender 2.76b on both (numpy 1.9.1)

I can confirm the issue. While it works fine on my Linux Mint 17.2 64 bit, I have the exact same problem on Windows 7 64 bit (same computer) I'm using blender 2.76b on both (numpy 1.9.1)

Aaron Carlisle commented

2017-02-02 17:13:34 +01:00

Added subscriber: @Blendify

Aaron Carlisle commented

2017-02-02 17:13:34 +01:00

Please try with the latest version of Blender we have updated these libs since then.

Ray molenkamp commented

2017-02-02 17:19:19 +01:00

Added subscriber: @LazyDodo

Ray molenkamp commented

2017-02-02 17:19:19 +01:00

Changed status from 'Open' to: 'Resolved'

Ray molenkamp closed this issue

2017-02-02 17:19:19 +01:00

Ray molenkamp commented

2017-02-02 17:19:19 +01:00

can confirm it's fixed with the latest libs.


z1= (7.49+0.71j)
z1 abs = 7.52357627728  z1 ang = 5.41506138451  Deg
z2= (127.01705922171767+0j)
z2 abs = 127.017059222  z2 ang = 0.0  Deg
z2/z1 = z3= (16.807194052219895-1.5932053106910715j)
z3 real = 16.807194052219895 z3 imag = -1.5932053106910715

z3 abs = 16.882537578 z3 ang = -5.41506138451  Deg
angle = -5.41506138451

can confirm it's fixed with the latest libs. ``` z1= (7.49+0.71j) z1 abs = 7.52357627728 z1 ang = 5.41506138451 Deg z2= (127.01705922171767+0j) z2 abs = 127.017059222 z2 ang = 0.0 Deg z2/z1 = z3= (16.807194052219895-1.5932053106910715j) z3 real = 16.807194052219895 z3 imag = -1.5932053106910715 z3 abs = 16.882537578 z3 ang = -5.41506138451 Deg angle = -5.41506138451 ```

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Numpy complex numbers division bug on Win 10 #47363