IMPORTANT NOTE: Because a unary minus is higher precedence than +exponentiation, the formula "-2^2" will evaluate to 4, not -4. This +convention is compatible with some programming languages, but not +others. This behavior can be overridden with parenthesis; the formula +"-(2^2)" will evaluate to -4. +
The 6 relational operators return either a 1.0 or 0.0 depending on whether the relationship between x and y is TRUE or FALSE. For example the expression x<10.0 in an atom-style variable formula will diff --git a/doc/variable.txt b/doc/variable.txt index ad11cc0b27..ed65e836a7 100644 --- a/doc/variable.txt +++ b/doc/variable.txt @@ -415,6 +415,12 @@ precedence. Parenthesis can be used to group one or more portions of a formula and/or enforce a different order of evaluation than what would occur with the default precedence. +IMPORTANT NOTE: Because a unary minus is higher precedence than +exponentiation, the formula "-2^2" will evaluate to 4, not -4. This +convention is compatible with some programming languages, but not +others. This behavior can be overridden with parenthesis; the formula +"-(2^2)" will evaluate to -4. + The 6 relational operators return either a 1.0 or 0.0 depending on whether the relationship between x and y is TRUE or FALSE. For example the expression x<10.0 in an atom-style variable formula will