File:Population of ancient tehuacan valley 1.svg
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editDescriptionPopulation of ancient tehuacan valley 1.svg |
English: Ancient population growth of ancient Tehuacán valley afret McNeish |
Date | |
Source | Own work |
Author | Merikanto |
Sources:
Richard McNeish: The Prehistory of the Tehuacan Valley Vol. 1-5, 1967–1972
https://www.academia.edu/36910072/The_Prehistory_of_the_Tehuacan_Valley_Vol_1_MacNeish_Byers_y_otros
https://users.pop.umn.edu/~rmccaa/mxpoprev/cambridg3.htm
The Peopling of Mexico from Origins to Revolution
Robert McCaa
rmccaa@tc.umn.edu
preliminary draft (notes omitted from web version) for:
Richard Steckel & Michael Haines (eds.),
The Population History of North America
(Cambridge University Press).
December 8, 1997
- tehuacan valley after mcneish and also mccaa
import numpy as np
import math
import matplotlib.pyplot as plt
times1=np.array([-11000,-6800,-5000,-3000,-1500,-200, 700])
times2=np.array([-6800,-5000,-3000,-1500,-200,700,1521])
times3=(times1+times2)/2
popula1=np.array([12,48,120,480,1800,12000,60000])
popula2=2*popula1
popula3=(popula1+popula2)/2
populacoeff1=np.array([1,4,10,40,150,1000,5000])
densitytimes1=np.array([-7000,-3400,-1000,-500,-100,700])
densitytimes2=np.array([-5000,-2300,-1000,-500,700, 700])
densitytimes3=(densitytimes1+densitytimes2)/2
denisties_per_100km2=np.array([2.2,14, 43, 165, 1100,3600])
print(times3)
p1=popula3[0] ## population at time zero
p2=popula3[6] ## population at time colonization
ta1=times3[0] ## presumed time of arrival paleoindians
ta2=times3[6] ## time just before arrival of Columbus
deltat=100 ## time step
- print (math.log(2.72))
- quit(-1)
td1=abs(ta2-ta1)
pd1=p2/p1
rangelen1=int(td1/(deltat))
r1=math.log(pd1)/td1
t_two=math.log(2)/r1
r2=int(r1*100000)/1000
- print (pd1)
- print (td1)
print(" td1 ",td1)
print(" r %",r2)
print(" T2 ",int(t_two))
- quit(-1)
- r1=0.000656
tees=[]
pops=[]
tb1=0
taa1=ta1
print(ta1,p1)
for n in range(0,rangelen1):
tb1=tb1+deltat
taa1=taa1+deltat
p2=p1*math.exp(tb1*r1)
p2=int(p2/10)*10
tees.append(taa1)
pops.append(p2)
#print(taa1,tb1,p2)
print(taa1,p2)
plt.plot(tees,pops, ":")
plt.plot(times3, popula3, "r-")
plt.plot(times3, popula1, "g-")
plt.plot(times3, popula2, "b-")
MEDIUM_SIZE = 12
plt.rcParams.update({'font.size': MEDIUM_SIZE,})
plt.tick_params(labelsize=MEDIUM_SIZE)
- plt.rc('font', size=SMALL_SIZE) # controls default text sizes
plt.rc('xtick', labelsize=MEDIUM_SIZE) # fontsize of the tick labels
plt.rc('ytick', labelsize=MEDIUM_SIZE)
plt.suptitle("Population of Tehuacán valley")
plt.title("estimated")
plt.xlabel("Year BC/AD", size=MEDIUM_SIZE)
plt.ylabel("Population", size=MEDIUM_SIZE)
- annot1="Initial population at "+str(ta1)+ " BC "+str(p1)
- plt.text(-10000, 4.0e6, "Assumptions", fontsize=12)
plt.show()
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