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You need to define the function in the plot using a python lambda function. This has to do with how the distribution function is being evaluated. It is not a symbolic function in this case but is a numeric function from python. The following produces a plot for me.

var('y')
T = RealDistribution('gaussian',1)
plot3d(lambda x,y: T.cum_distribution_function((1-y)/x), (x,-2,2), (y,-2,2))

See the link here to execute the code in the single cell server.

You need to define the function in the plot using a python lambda function. This has to do with how the distribution function is being evaluated. It is not a symbolic function in this case but is a numeric function from python. The following produces a plot for me.

var('y')
T = RealDistribution('gaussian',1)
plot3d(lambda x,y: T.cum_distribution_function((1-y)/x), (x,-2,2), (y,-2,2))

See the link here to execute the code in the single cell server.