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doc/eval: fix/extend documentation for root() function

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Stefano Sabatini 2013-01-23 11:45:31 +01:00
parent cdf0877bc3
commit d99bc84752
1 changed files with 11 additions and 2 deletions
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doc/eval.texi
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@ -175,8 +175,17 @@ When the series does not converge the results are undefined.
Return the current (wallclock) time in seconds.
@item root(expr, max)
Finds x where f(x)=0 in the interval 0..max.
f() must be continuous or the result is undefined.
Find an input value for which the function represented by @var{expr}
with argument @var{ld(0)} is 0 in the interval 0..@var{max}.
The expression in @var{expr} must denote a continuous function or the
result is undefined.
@var{ld(0)} is used to represent the function input value, which means
that the given expression will be evaluated multiple times with
various input values that the expression can access through
@code{ld(0)}. When the expression evaluates to 0 then the
corresponding input value will be returned.
@end table
The following constants are available: