IF - Conditional expression execution (Scripting operation)

PURPOSE

To allow evaluation of a conditional expression or loop iteration control (modeled after the FORTRAN 'IF' statement).

SEE ALSO

IF_GOTO	[Conditional jump (Scripting operation)]
IF_THEN	[Conditional execution of operations (Scripting operation)]
DO	[Start of DO loop (Scripting operation)]

USAGE

.OPERATION: IF(<EXP>.<LC>.<EXP>) <R> = <EXP>

<or>
IF(<EXP>.<LC>.<EXP>) EXIT
<or>
IF(<EXP>.<LC>.<EXP>) CYCLE

Where:

1. <EXP> is an expression
2. <LC> is a logical comparator. The following comparators are allowed:

EQ equal

NE not equal

GT greater

GE greater/equal

LT less

LE less/equal

3. <R> is a register variable.

EXAMPLES:

IF([xlen].GE.15.) [xpad]=57

IF([xlen].LT.(13-2)) [resol]=5.6

IF([xlen].LT.(13-3)) CYCLE

(Within a DO loop)

SUBROUTINES

LOGIFQ

CALLER

SPIDER