# Arithmetic transformations

## Arithmetic

The symbols
= + - * / ^
have their usual arithmetic meaning
Syntax yield !/10
{0/0} gives 0 but otherwise
by zero gives a missing value.
!^v
the data (which must be positive) to the power v
!^0
takes natural
logarithms of the data (which must be
positive).
## Logical

== ltgt lt= gt= lt gt
are logical operators forming 1 if
true, 0 if false.
yield
## Example

yield !*.125
SQRyld !=yield !^ 0.5
LNyld !=yield !^0
INVyld !=yield !^-1
high !=yield !>10

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