I am a sage newbie so please be easy on me.
In sage, to make a differential equation one must write, as shown here
http://www.sagemath.org/doc/reference/calculus/sage/calculus/desolvers.html
sage: x = var('x')sage: y = function('y', x)sage: desolve(diff(y,x) + y - 1, y)
My question is only about the third line above. I'd like to write this as
sage: desolve( diff(y(x),x) + y(x) - 1, y(x))
Three reasons:
1. It is makes it more clear which is the dependent and the independent variable
2. It makes it easy to copy my Maple differential equations as is
to sage since that is the way Maple specifies it also.
3. it is closer to how textbooks write differential equations.
When I try the second syntax now, I get this warning:
sage: desolve(diff(y(x),x) + y(x) - 1, y(x))
/home/me/data/sage/sage-6.2-i686-Linux/local/lib/python2.7/site-packages/IPython/core/interactiveshell.py:2834:
DeprecationWarning: Substitution using function-call syntax and
unnamed arguments is deprecated and will be removed from a future
release of Sage; you can use named arguments instead,
like EXPR(x=..., y=...)
See http://trac.sagemath.org/5930 for details.
exec code_obj in self.user_global_ns, self.user_ns
Does this mean this syntax y(x) will be removed from sage? Why? and is
it possible to keep it?
--Nasser
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