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# 4 - basic usage
"""
Please note, this code is only for python 3+. If you are using python 2+, please modify the code accordingly.
"""
from __future__ import print_function
import numpy as np
import theano.tensor as T
from theano import function

# basic
x = T.dscalar('x')
y = T.dscalar('y')
z = x+y     # define the actual function in here
f = function([x, y], z)  # the inputs are in [], and the output in the "z"

print(f(2,3))  # only give the inputs "x and y" for this function, then it will calculate the output "z"

# to pretty-print the function
from theano import pp
print(pp(z))

# how about matrix
x = T.dmatrix('x')
y = T.dmatrix('y')
z = x + y
f = function([x, y], z)
print(f(np.arange(12).reshape((3,4)), 10*np.ones((3,4))))