Hi, On Thu, Jan 21, 2010 at 2:14 AM, Stochastix <laurent.decreusef...@gmail.com> wrote:
<SNIP> > In other words, how can we substitute x=2 to the expression 8*x ? > I guess this is somewhere in the docs but I didn't find where. Is the following what you want? [mv...@mod primroots]$ sage ---------------------------------------------------------------------- | Sage Version 4.3, Release Date: 2009-12-24 | | Type notebook() for the GUI, and license() for information. | ---------------------------------------------------------------------- sage: a = 2*x sage: b = a^2 sage: g = diff(b, x) sage: g 8*x sage: g(x=2) 16 The documentation on symbolic expressions [1] might help, or the section on substitution [2]. [1] http://www.sagemath.org/doc/reference/sage/symbolic/expression.html#sage.symbolic.expression.Expression.subs [2] http://www.sagemath.org/doc/reference/sage/symbolic/relation.html#substitution -- Regards Minh Van Nguyen
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