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TypeError with graphs.RandomGNP

asked 2018-11-27 07:29:09 -0500

jrc92 gravatar image

I tried calling gnp = graphs.RandomGNP(20, .1, algorithm = 'sage') and it gave me the following error

TypeError                                 Traceback (most recent call last)
<ipython-input-147-7915a3a5dbc9> in <module>()
----> 1 gnp = graphs.RandomGNP(Integer(20), RealNumber('.1'), algorithm = 'sage')

/anaconda3/envs/graphs/lib/python3.6/site-packages/sage/graphs/generators/ in RandomGNP(n, p, seed, fast, algorithm)
    122         # We use the Sage generator
    123         from sage.graphs.graph_generators_pyx import RandomGNP as sageGNP
--> 124         return sageGNP(n, p)
    125     else:
    126         raise ValueError("'algorithm' must be equal to 'networkx' or to 'Sage'.")

/anaconda3/envs/graphs/lib/python3.6/site-packages/sage/graphs/graph_generators_pyx.pyx in sage.graphs.graph_generators_pyx.RandomGNP (build/cythonized/sage/graphs/graph_generators_pyx.c:1366)()
     68     # integers are on 31 bits. We thus set the pivot value to p*2^31
     69     cdef float RAND_MAX_f = (1<<31)*1.0
---> 70     cdef int pp = int(round(p*(1<<31)))
     72     if directed:

TypeError: type sage.rings.real_mpfr.RealNumber doesn't define __round__ method

Not sure what went wrong here.. Appreciate any help! Thank you!

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Did you install Sage with Conda? Or do you just have Anaconda in your PATH?

slelievre gravatar imageslelievre ( 2018-11-27 12:26:24 -0500 )edit

typical sage+python3 error ; already fixed in the latest beta

FrédéricC gravatar imageFrédéricC ( 2018-11-27 13:09:59 -0500 )edit

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answered 2018-11-27 12:25:52 -0500

slelievre gravatar image

This works in Python2-based Sage, but not yet in Python3-based Sage.

Either you are using Python3-based Sage, or you have Anaconda in your PATH and it is interfering with Sage.

If your Sage is Python2-based, try removing Anaconda from your PATH before you start Sage.

If your Sage is Python3-based, I suggest also having a Python2-based Sage handy.

Currently, SageMath built with Python3 is still work in progress. You have found one place where it is not ready yet. While testing out Python3-based SageMath is encouraged, it is recommended to also have a Python2-based Sage to use when one hits such a limitation.

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Asked: 2018-11-27 07:29:09 -0500

Seen: 61 times

Last updated: Nov 27 '18