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    <p>Fix your identation?</p> <pre><code>import numpy as np import numpy.linalg import random import matplotlib.pyplot as plt import pylab from scipy.optimize import curve_fit from array import array def main(): n=20 #number of species spec=np.zeros((n+1)) for i in range(0,n): spec[i]=i t=100 #initial number of matrices to check B = np.zeros((n+1)) #matrix to store the results of how big the matrices have to be for k in range (0,t): A=np.zeros((n,n)) I=np.ones((n)) for i in range(0,n): for j in range(i+1,n): A[j,i]=random.random() for i in range(0,n): for j in range(i+1,n): A[i,j] = A[j,i] for i in range(n): A[i,i]=1 allpos = 0 while allpos !=1: #while all solutions are not positive x = numpy.linalg.solve(A,I) if any(t&lt;0 for t in x): #if any of the solutions in x are negative p=np.where(x==min(x)) # find the most negative solution, p is the position x=np.delete(x, p, 0) A=np.delete(A, p, 0) A=np.delete(A, p, 1) I=np.delete(I, p, 0) else: allpos = 1 #set allpos to one so loop is broken l=len(x) B[l] = B[l]+1 B = B/n pi=3.14 resfile=open("results.txt","w") for i in range (0,len(spec)): resfile.write("%d " % spec[i]) resfile.write("%0.6f \n" %B[i]) resfile.close() plt.hist(B, bins=n) plt.title("Histogram") plt.show() plt.plot(spec,B) plt.xlabel("final number of species") plt.ylabel("fraction of total matrices") plt.title("plot") plt.show() if __name__ == '__main__': main() </code></pre> <p>Got this:</p> <p><img src="https://i.stack.imgur.com/fzV15.png" alt="enter image description here"></p>
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    1. This table or related slice is empty.
    1. POErrors with matplotlib plot, python
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    1. This table or related slice is empty.
    1. USE.Z.
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    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. VO
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      1. This table or related slice is empty.
      1. VTUpMod
    1. COReally sorry... I posted the wrong code before, I posted code that did work. This new code does not work so any input on that would be great. Thanks very much for testing it anyway.
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      1. USCatherine Georgia
 

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