Some help with some calculus and fish

[agritheory]

Full disclosure, I've never taken calculus but I understand what I'm up against here. I need to return a list of values that represent the estimated weight of a fish on day n (index) based on the log of two inputs.

Growth from 35 to 258 g in 61 days yields the equation: ln(258) – ln(35) = tk
t is time in days; k is a rate constant (feed conversion ratio; lbs fed:lbs gained, which is not actually constant).

Anyway, this should end up with an inclined sigmoidal curve.

[Image: slide0019_image043.gif]

from math import log, exp

start_weight = 35
end_weight = 258
t = 61
# k = ?
# list comprehension
return [log(end_weight) - log(start_weight) for x in range(0, t)]  # some help here please

Here's my source document