SUMMARY

Controls Math Operator Precedence

SYNTAX

MATHOP NORMAL|MATH|FORTRAN|NONE|OLD

INPUT

NORMAL:	Use Normal Math Operator Precedence
MATH:	Same as Normal
FORTRAN:	Same as Normal
NONE:	Use No Operator Precedence
OLD:	Same as None

DEFAULT VALUES

MATHOP NORMAL

DESCRIPTION

This command controls math operator prededence. Normally, multiplication and division have a higher predecence than addition and subtraction. Exponentiation has the highest precedence.

Older version of SAC (pre-101.6) used a math evaluation without operator precedence. Terms were evaluated in order where the earlier in the expression operators had higher precedence.

If matop is not called, the effect is the same as mathop normal. The function mathop has been introduced to deal with scripts and macros that were written using the mathop old precedence. Rather than change the coding, one simply enters mathop old before the lines with inline expressions.

EXAMPLES

With Operator Precedence:

SAC> mathop normal
SAC> evaluate 1+2*3
===> 7
SAC> evaluate 1+(2*3)
===> 7

Without Operator Precedence (as was true without mathop prior to v101.6):

SAC> mathop old
SAC> evaluate 1+2*3
===> 9
SAC> evaluate 1+(2*3)
===> 7

LATEST REVISION

Version 101.6 (new)