python 2.7 - Write a function to draw a cobweb plot of fixed point iteration -

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i have following code draw cobweb function:

def cob_plot(f,x0,n):     xvals = [0]*(n+1)     xvals[0] = x0     jj in range(1,n+1):         xvals[jj] = f(xvals[jj-1])      plt.scatter(xvals[0:n],xvals[1:])      plt.scatter(xvals[1:],xvals[1:])       kk in range(1,n):         plt.plot([xvals[kk-1],xvals[kk]],[xvals[kk],xvals[kk]]         plt.plot([xvals[kk],xvals[kk]],[xvals[kk],xvals[kk+1]]      plt.xlabel("$x_{n-1}$")     plt.ylabel("$x_{n}$")

i need modify code function:

cobweb(f, x0, n, xmin, xmax, ymin, ymax)

so cobweb works on function. example:

cobweb(cos, 1, 200, 0, 1.5, 0, 1)

any suggestions or opinions on how modify code? using python 2.7


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