# product of functions

I just started using SageMath and I am trying to do something simple but I cannot figure it out.

I have a Gaussian function

```
mu, sigma, x, N = var('mu, sigma, x, N')
P(x) = 1/sqrt((2*pi*sigma^2))*exp(-(x-mu)^2/(2*sigma^2))
```

and I want to calculate the product of N such functions.

I tried

```
f = lambda x, N: prod([P for x in range(1, N)])
f(x, N)
```

and I got the error:

```
TypeError: unable to convert N to an integer
```

I works if I choose `N`

to be some number, but I would like to get a symbolic expression output.

A symbolic product in SageMath is currently not implemented, but you could take a logarithm and use a symbolic sum.

In fact it is! I opened

to make this more discoverable.