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Flu diagram

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S = [49000000]
B = [8]
C = [17640]

NUM_YEARS = 180

for yr in range(NUM_YEARS):
    iyr =   i[t-1]+8*s(t-1)-2/3*I[t-1]+2/3*i[t-1]-1/3*i[t-1]
    syr = s[t-1] -bsi
    ryr = r[t-1] + 1/3*i[t-1]
    i.append(iyr)
    s.append(syr)
    r.append(ryr)
    
print A[NUM_YEARS]
print B[NUM_YEARS]
print C[NUM_YEARS]

r(0)=0
s(0)+1-i(0)-r(0)
i(0)=10/4900000
*** WARNING: Code contains possible implicit multiplication *** *** Check if any of [ 3I(t, 3I(t, 3I(t, 3I(t ] need a "*" sign for multiplication, e.g. 5x should be 5*x ! *** Error in lines 5-11 Traceback (most recent call last): File "/cocalc/lib/python2.7/site-packages/smc_sagews/sage_server.py", line 1188, in execute flags=compile_flags) in namespace, locals File "<string>", line 2 iyr = i[t-Integer(1)]+bs(t-Integer(1))-Integer(2)/3I(t-Integer(1))+Integer(2)/3I(t-Integer(1))-Integer(1)/3I(t-Integer(1)) ^ SyntaxError: invalid syntax 
Apts = zip(list(range(NUM_YEARS+1)),A)


P = list_plot(Apts,plotjoined=True)

Bpts = zip(list(range(NUM_YEARS+1)),B)
Q = list_plot(Bpts,plotjoined=True,color='red')

Cpts = zip(list(range(NUM_YEARS+1)),C)
R = list_plot(Cpts,plotjoined=True,color='green')

show(P+Q+R)

total = [i[t]+r[t]+s[t](NUM_YEARS+1) for i in range]


Tpts = zip(list(range(NUM_YEARS+1)),total)
T = list_plot(Tpts,plotjoined=True, color='purple')

show(P+Q+R+T)