Description
Behaviour
It evaluates a predicate. For each item of input array, if ‘expression0’ satisfies ‘comparison’, then ‘expression1’ is executed, else ‘expression2’ is executed.
Parameters
- input measure type: Ophidia typing. Supported types are: ‘oph_double’; ‘oph_float’; ‘oph_long’; ‘oph_int’; ‘oph_short’; ‘oph_byte’.
- output measure type: Ophidia typing. Supported types are: ‘oph_double’; ‘oph_float’; ‘oph_long’; ‘oph_int’; ‘oph_short’; ‘oph_byte’.
- measure: input measure.
- expression 0: first expression.
- comparison: condition to be verified. Only one of the following values are allowed:
- ‘OPH_MORE_THAN_ZERO’, ‘OPH_POSITIVE’, ‘>0’ or ‘>’ in case expression 1 has to evaluated only if input value is positive;
- ‘OPH_LESS_THAN_ZERO’, ‘OPH_NEGATIVE’, ‘<0’ or ‘<’ in case expression 1 has to evaluated only if input value is negative;
- ‘OPH_EQUAL_TO_ZERO’, ‘OPH_ZERO’, ‘==0’ or ‘0’ in case expression 1 has to evaluated only if input value is zero;
- ‘OPH_MORE_OR_EQUAL_TO_ZERO’, ‘OPH_NOT_NEGATIVE’, ‘>=0’ or ‘>=’ in case expression 1 has to evaluated only if input value is not negative;
- ‘OPH_LESS_OR_EQUAL_TO_ZERO’, ‘OPH_NOT_POSITIVE’, ‘<=0’ or ‘<=’ in case expression 1 has to evaluated only if input value is not positive;
- ‘OPH_NOT_EQUAL_TO_ZERO’, ‘OPH_NOT_ZERO’, ‘!=0’, ‘!=’, ‘<>0’ or ‘<>’ in case expression 1 has to evaluated only if input value is not zero;
- ‘OPH_NULL’, ‘NULL’, ‘NAN’, ‘MISSED’, ‘MISS’, ‘ISNULL’, ‘ISNAN’ or ‘ISMISSED’ in case expression 1 has to evaluated only for missing values.
- expression 1: expression executed if expression 0 satisfies comparison.
- expression 2: expression executed if expression 0 does not satisfy comparison.
Return type
Binary-array.
Examples
Identify measures with temperature values greater than 300 K.
oph_predicate('OPH_DOUBLE','OPH_DOUBLE',measure,'x-300','>0','1','0')
Operation type
simple
