# Revision history [back]

### Strange problem with double integrals

I need to calculate a double of integral a large expression numerically. But, I found a strange error. The code:

[code] def doubleIntegral(): def f2(theta): def f1(phi): return thetaphi/pi return numerical_integral(f1,0,2pi) return numerical_integral(f2,0,pi) [\code]

works. but

[code] a = theta*phi/pi # Suppose this is a huge expression that came out of previous calculations

def doubleIntegral(): def f2(theta): def f1(phi): return a return numerical_integral(f1,0,2*pi) return numerical_integral(f2,0,pi) [\code]

doesn't work [code] unable to simplify to float approximation unable to simplify to float approximation . . . [/code] . What is going on? And how can I fix this?

### Strange problem with double integrals

I need to calculate a double of integral a large expression numerically. But, I found a strange error. The code:

[code]

def doubleIntegral():
def f2(theta):
def f1(phi):
return thetaphi/pi
return numerical_integral(f1,0,2pi)
theta*phi/pi
return numerical_integral(f1,0,2*pi)
return numerical_integral(f2,0,pi)
[\code]

works. but

[code] a = theta*phi/pi # Suppose this is a huge expression that came out of previous calculations

def doubleIntegral():
def f2(theta):
def f1(phi):
return a
return numerical_integral(f1,0,2*pi)
return numerical_integral(f2,0,pi)
[\code]

doesn't work [code] work

unable to simplify to float approximation
unable to simplify to float approximation
.
.
.
[/code]
. 

What is going on? And how can I fix this?

### Strange problem with double integrals

I need to calculate a double of integral a large expression numerically. But, I found a strange error. The code:

def doubleIntegral():
def f2(theta):
def f1(phi):
return theta*phi/pi
return numerical_integral(f1,0,2*pi)
return numerical_integral(f2,0,pi)


works. but

a = theta*phi/pi  # Suppose this is a huge expression that came out of previous calculations calculations

def doubleIntegral():
def f2(theta):
def f1(phi):
return a
return numerical_integral(f1,0,2*pi)
return numerical_integral(f2,0,pi)
doesn't work unable to simplify to float approximation
unable to simplify to float approximation
.
.
.
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