parametric_plot should take the variable range as (var, min, max) like plot

[jasongrout]

This should work to be consistent with plot:

sage: parametric_plot((2*x, x^2+1), (x,0,1))
---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)

/home/grout/<ipython console> in <module>()

TypeError: parametric_plot() takes exactly 3 arguments (2 given)

Component: graphics

Issue created by migration from https://trac.sagemath.org/ticket/4152

[jasongrout]

comment:1

This was also mentioned in #2410, but was not a fundamental part of that ticket.

[mwhansen]

comment:2

Attachment: trac_4152.patch.gz

[jasongrout]

apply on top of previous patch

[jasongrout]

comment:3

Attachment: trac_4152-docs-dispatch.patch.gz

positive review for mhansen's patch. My patch further adds to the documentation and makes the parametric plot function dispatch the 3d version when needed. My patch needs to be reviewed.

[mwhansen]

comment:4

Positive review for Jason's part.