Dear all,
I am new to SymPy and trying to learning how to use.
I have installed the latest SymPy (v. 0.6.7) and tried the following
Python script:
sympy_test.py
from sympy import Symbol
from math import *
x = Symbol('x')
i = 0
prior = 1 / sqrt(2*pi) * exp(-1*x**2 / 2)
p = 1 / (1 + exp(-1*discriminations[i]*(x - difficulties[1])))
q = 1 - p
posterior = prior * q
print posterior
But, when I ran this Python code, I got the following error message:
Traceback (most recent call last):
File "/Applications/eclipse/plugins/
org.python.pydev.debug_1.5.7.2010050621/pysrc/pydevd.py", line 978, in
<module>
debugger.run(setup['file'], None, None)
File "/Applications/eclipse/plugins/
org.python.pydev.debug_1.5.7.2010050621/pysrc/pydevd.py", line 780, in
run
execfile(file, globals, locals) #execute the script
File "/Users/yjlee/Documents/Worx/EclipseWorx/SymPyProjects/src/
sympy_test.py", line 44, in <module>
prior = 1 / sqrt(2*pi) * exp(-1*x**2 / 2)
File "/Library/Python/2.6/site-packages/sympy/core/basic.py", line
2103, in __float__
raise ValueError("Symbolic value, can't compute")
ValueError: Symbolic value, can't compute
All I was trying to do was to get a product of two functions, and I
could not figure out what I did wrong.
Could anyone tell me what I did wrong?
Thanks in advance.
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