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graphable_output_variablep.py
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graphable_output_variablep.py
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#! /usr/bin/env python3
import math
from datetime import datetime
datetime.now().replace(microsecond=0).isoformat()
def main():
print('##', datetime.now().replace(microsecond=0).isoformat())
dt = 0.001
N0B = 2
N0W = 2
#Prey_Growth_Rate = 5
Prey_Side_Interaction_Rate = 0.3
Predator_Side_Interaction_Rate = 0.5
Predator_Death_Rate = 0.8
NGen = 87
NB_Previous = N0B
NW_Previous = N0W
Var_Range = 400
print('#from variables:', 'dt=', dt, 'NOB=', N0B, 'NOW=', N0W, 'Prey-side interactionrate=', Prey_Side_Interaction_Rate, 'Predator-side interaction rate=', Predator_Side_Interaction_Rate, 'Predator death rate', Predator_Death_Rate, 'NGen =', NGen, 'range of prey growth rate=', Var_Range)
for i in range(Var_Range):
Prey_Growth_Rate = i+1
for z in range(NGen):
dNB =(Prey_Growth_Rate * NB_Previous * dt) - (Prey_Side_Interaction_Rate * NB_Previous * NW_Previous * dt)
NB_New = NB_Previous + dNB
dNW = (Predator_Side_Interaction_Rate * NB_Previous * NW_Previous* dt) - (Predator_Death_Rate * NW_Previous * dt)
NW_New = NW_Previous + dNW
if NB_Previous <= 0:
NB_New = 0
print(Prey_Growth_Rate, z+1, '1')
# x = Prey_Growth_Rate
# y = z+1
# print(x, y)
break
else:
NB_Previous = NB_New
if NW_Previous <= 0:
NW_New = 0
print(Prey_Growth_Rate, z+1, '2')
break
else:
NW_Previous = NW_New
if z+1 == NGen:
print(Prey_Growth_Rate, z+1, '3')
break
NB_Previous = N0B
NW_Previous = N0W
main()