def iterationsplot_array(g,x_0,n,X1,X2):
x=g.variables()[0]
a=[(0,x_0)]
L=[x_0]
W=line([(1,1),(1,1)])
for i in range(n):
L.append(g.subs(x=L[i]))
a.append((i+1,g.subs(x=L[i])))
line1=line( [ ( i, L[i] ), ( i+1, L[i+1] ) ],color='red')
W +=line1
W+=list_plot(a)
W.show(ymin=X1, ymax=X2)
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iterationsplot_array(-.5*x+1,10,10,-10,10)
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iterationsplot_array(.5*x+1,10,10,-1,10)
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iterationsplot_array(1.1*x+1,-1,15,-1,20)
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iterationsplot_array(-1.1*x+1,-1,15,-10,20)
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