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Unable to start QEPCAD

asked 2015-08-18 13:13:10 +0200

Alasdair gravatar image

I have compiled and installed qepcad-1.50, but I can't run it. For example, these are lifted from the documentation:

sage: var('a,b,c,d,x,y,z')
sage: qf = qepcad_formula
sage: ellipse = 3*x^2 + 2*x*y + y^2 - x + y - 7
sage: F = qf.exists(y, ellipse == 0)
sage: qepcad(F)

However, this produces an error:

RuntimeError: Unable to start QEPCAD

I did discover a patch at but I'm not sure how to apply it. I'd be very happy for some advice.

I'm running sage-6.2, under Ubuntu 14.04.

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answered 2015-08-18 14:38:08 +0200

tmonteil gravatar image

The qepcad package is broken for a while and was considered experimental. It has just been repackaged and will be available in the next 6.9 release, see trac ticket 10224. If you can not wait, i suggest to build the latest beta (6.9.beta2) release which already contains it, you can get its source code at

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Asked: 2015-08-18 13:13:10 +0200

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Last updated: Aug 18 '15