.BG
.FN exp
.FN log
.FN log10
.FN sqrt
.TL
Exponential Functions
.CS
exp(x)
log(x, base=exp(1))
log10(x)
sqrt(x)
.AG x
numeric or complex.  Missing values (`NA's) are allowed.
.AG base
(positive) numeric or complex base for logarithms.
.RT
data transformed by the specified function,
with attributes preserved.
By default, `log' computes natural logs.
Numeric arguments must be positive for `log', `log10' and `sqrt', otherwise
.Co NA
is returned and a warning message is generated.
.Tr
See section 5.1.5 for details on domains and branch cuts in the
case of complex arguments.
.En
.KW math
.WR
