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# Plotting eigenvalues in complex plane

Would you please tell how I can define a random matrix whose entries are 1, 0 and plot its eigenvalues in the complex plane?

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## 1 Answer

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can do

sage: point2d(random_matrix(ZZ, 10, 10, x=0, y=2).charpoly().roots(CDF, False))

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## Comments

Increasing the size of the points looks even better:

point2d(random_matrix(ZZ, 10, 10, x=0, y=2).charpoly().roots(CDF, False), size=50)


@vdelecroix Thanks, if I want to do this for several times, I checked the following code, but it didn't work

for i in range(5):
point2d(random_matrix(ZZ, 10, 10, x=0, y=2).charpoly().roots(CDF, False), size=50)


Is it correct?

@Sébastien that depends on the size of the matrix.

@salam: if the code would have been correct it would run. Just learn how to make a loop in Python. But to get several pictures, it might be more convenient to use graphics_array.

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Asked: 2020-04-18 00:58:31 +0200

Seen: 62 times

Last updated: Apr 18 '20