[with patch, positive review] plot() does not follow the same interval range conventions as plot3d()

[moretti]

sage: plot3d(x^2 + y^2, (x,-2,2), (y,-2,2))

is valid, however, to do a 2d plot, you use the syntax

sage: plot(x^2, x, -2, 2).

I spoke with William about this, he wants to deprecate the plot(x^2, -2, 2) syntax for 2d plotting and introduce a new preferred syntax:

sage: plot(x^2, (x, -2, 2))

[moretti]

Ignore the previous patch, it does not have all the required changes.

[moretti]

I implemented this in the attached. It makes both the old and new style of plot() syntax valid. However the documentation mentions that plot(x^{2, (x, a, b)) is the preferred syntax. Please test it out.}

[was]

That this doesn't work anymore is definitely a bug:

sage: plot(sin(2), (x,0,10*pi))
BOOM!

Likewise for

sage: plot(sin(2), 0,10*pi)
BOOM

I'll try to fix this....

[was]

It turns out the plot(sin(2), (x,0,10*pi)) problem above was a really genuine bug coming from an indentation mistake on line 624 (I will attach a patch fixing this and other issues).

[was]

apply the hg bundle that bobby posted, then apply this plain text patch which fixes one serious bug.

[was]

Apply the plot.hg followed by trac-1778-referee.patch

[mabshoff]

I had to resolve some slight merge conflict with #1779 in setup.py.

Cheers,

Michael

[mabshoff]

Merged in Sage 2.10.alpha3