68 Alphabetical Listing
expand()
Catalog >
expand(Expr1,Var) returns Expr1
expanded with respect to Var. Similar
powers of Var are collected. The terms and
their factors are sorted with Var as the
main variable. There might be some
incidental factoring or expansion of the
collected coefficients. Compared to
omitting Var, this often saves time,
memory, and screen space, while making
the expression more comprehensible.
Even when there is only one variable, using
Var might make the denominator
factorization used for partial fraction
expansion more complete.
Hint: For rational expressions, propFrac() is
a faster but less extreme alternative to
expand().
Note: See also comDenom() for an
expanded numerator over an expanded
denominator.
expand(Expr1,[Var]) also distributes
logarithms and fractional powers
regardless of Var. For increased
distribution of logarithms and fractional
powers, inequality constraints might be
necessary to guarantee that some factors
are nonnegative.
expand(Expr1, [Var]) also distributes
absolute values, sign(), and exponentials,
regardless of Var.
Note: See also tExpand() for trigonometric
angle-sum and multiple-angle expansion.
expr()
Catalog >
expr(String) ⇒ expression
Returns the character string contained in
String as an expression and immediately
executes it.
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