On May 24, 3:04 am, mankoff <[email protected]> wrote:
> y = x^2
> show(y)
>
> In a worksheet in the notebook, this shows x and then a small raised
> two.
> I'd like it to show 'y = ' and then that symbol.
What is going on here is that in Python (which Sage is based on), y=
assigns an object to the name y.
So that y IS now "x^2".
> eqn = y == x^2
> show(eqn)
>
> does what I want (y=x^2)
Correct - for the same reason. But now you have a symbolic relation,
rather than a symbolic expression. What would y(3) mean in this
case? The thing you have is not a function.
I realize this is not what we always do in math - but that is because
we are sloppy, similarly to how students sometimes write x^2=2x when
they take derivatives. It takes time to adjust to this in computer
systems (or did for me).
> But the upper code (y=x^2) lets me operate on it (y(3), diff(y), etc.)
> wherease y==x^2 does not.
>
> This gets more important with longer more complex equations. For
> example:
>
> D(H,mu,alpha,x,y,z) = (H*pi*mu*alpha)/(x*y + z^3)
>
> When displaying it, it would be nice to see:
> D = ...
> But instead I see
> (H,mu,alpha,x,y,z) |-> ...
>
> Which isn't clear to someone reading the worksheet that the LHS is D.
>
Again, D here is not the LHS. D is a function, and the pretty print
is showing the standard domain |--> range representation.
However, there is a solution to your dilemma, if you're willing to do
a little extra work.
html("$D:%s$"%latex(D))
What this does is to turn your thing into HTML. The latex() gives
what shows up under show() in the notebook, and the %s tell you what
belongs there. The $$ tell jsmath to make it look nice, and the ""
make sure we know it's a Python string, not something else.
Let us know if this is what you need.
- kcrisman
--
To post to this group, send email to [email protected]
To unsubscribe from this group, send email to
[email protected]
For more options, visit this group at
http://groups.google.com/group/sage-support
URL: http://www.sagemath.org
