On Jun 7, 10:26 am, dbjohn <[email protected]> wrote:
> Yes that code works in a single cell for me. When I put it in an
> interact and plot I get an error. Below is a simplified part of the
> program I am working on. I am using the online notebook. I find when I
> comment out the lines with myTangent the plot will display correctly,
> so there is something wrong with the line I am trying to create.
>
> sage: @interact
> ... def myGraph(a = slider(-5, 5,step_size=1, default=0, label='x
> value')):
> ... plotA = plot((x^2), x)
> ... pointA = point((1,1))
> ... myB = point((3,3))
> ... myTangent = line([pointA, myB])
> ... plotA += pointA
> ... plotA += myB
> ... plotA += myTangent
> ... plotA.show(aspect_ratio=1,xmin=-25, xmax=25, ymin=-25,
> ymax=25,figsize=[10, 10])
Compare these two.
> > sage: pointA= (1,1)
> > sage: pointB = (2,2)
> > sage: myline = line([pointA, pointB])
> > sage: myline
Notice that William's pointA is just (1,1), whereas yours is
point((1,1)). The reason for the unusual error message is that
sage: line??
shows that if we get any error from trying to make a 2D line, it
assumes you want a 3D line.
Try
@interact
def myGraph(a = slider(-5, 5,step_size=1, default=0, label='x
value')):
plotA = plot((x^2), x)
pointA = (1,1)
myB = (3,3)
myTangent = line([pointA,myB])
plotA += point(pointA)
plotA += point(myB)
plotA += myTangent
plotA.show(aspect_ratio=1,xmin=-25, xmax=25, ymin=-25,
ymax=25,figsize=[10, 10])
though of course you are not actually using 'a' anywhere in the
interact, but I wasn't sure exactly what your intent was so I left it
alone. Good luck!
To sage-devel types: would it be worth throwing a check in line for a
Graphics object consisting of one element which is one point, so that
the original thing would work, or is that behavior we don't want to
encourage?
- kcrisman
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