In article <[EMAIL PROTECTED]>, Sambo <[EMAIL PROTECTED]>
wrote:
> I have the following module:
> -------------------------------
> import math
>
> def ac_add_a_ph( amp1, ph1, amp2, ph2 ):
>
> amp3 = 0.0
> ph3 = 0.0
> ac1 = ( 0, 0j )
> ac2 = ( 0, 0j )
> ac3 = ( 0, 0j )
> ac1 = complex( amp1 * math.cos( math.radians( ph1 ) ), amp1 * math.sin(
> math.radians( ph1 ) ) )
> ac2 = complex( amp2 * math.cos( math.radians( ph2 ) ), amp2 * math.sin(
> math.radians( ph2 ) ) )
> ac3 = ac1 + ac2
> amp3 = math.abs( ac3 )
> ph3 = math.atan( ac3.imag / ac3.real )
> return [amp3, ph3]
> --------------------------------------
> when I import it (electronics) in python.exe in windows2000 and
> try to use it, it croaks. ???
>
> >>> import math
> >>> import electronics
> >>> print electronics.ac_add_a_ph( 10, 0 , 6 , 45 )
> Traceback (most recent call last):
> File "<stdin>", line 1, in ?
> File "f:\devel\python\electronics.py", line 10, in ac_add_a_ph
> ac1 = complex( amp1 * math.cos( math.radians( ph1 ) ), amp1 * math.sin(
> math
> .radians( ph1 ) ) )
> NameError: global name 'cos' is not defined
> >>>
That's not what I get when I run it (admittedly, not on windows). I get:
>>> import math
>>> import electronics
>>> print electronics.ac_add_a_ph( 10, 0 , 6 , 45 )
Traceback (most recent call last):
File "<stdin>", line 1, in ?
File "electronics.py", line 13, in ac_add_a_ph
amp3 = math.abs( ac3 )
AttributeError: 'module' object has no attribute 'abs'
>>>
which is exactly what I expected, since abs (which is indeed absolute
value) is a built-in function, not a part of the math module. Are you sure
the stack trace you posted matches the source code you posted?
By the way, when using math functions, I find it's usually easier to import
them into my namespace by doing "from math import *", then I can just use
sin(), cos(), etc directly, instead of having to do math.sin() or
math.cos(). Especially for common math functions, this makes your code a
lot easier to read.
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