oph_reduce¶

Description¶

Behaviour

It reduces a measure array performing the specified operation on ‘count’ elements.

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.
operator name: type of operator
- ‘oph_count’: computes the number of actual values (not missing);
- ‘oph_max’: computes the maximum (default);
- ‘oph_min’: computes the minimum;
- ‘oph_avg’: computes the mean;
- ‘oph_sum’: computes the sum;
- ‘oph_std’: computes the standard deviation;
- ‘oph_var’: computes the variance;
- ‘oph_cmoment’: computes the central moment;
- ‘oph_acmoment’: computes the absolute central moment;
- ‘oph_rmoment’: computes the raw moment;
- ‘oph_armoment’: computes the absolute raw moment;
- ‘oph_quantile’: computes the quantile;
- ‘oph_arg_max’: compute the index of the maximum;
- ‘oph_arg_min’: compute the index of the minimum.
count: number of elements to be reduced. Default value (0) corresponds to the entire array.
order: order used in evaluation the moments or value of the quantile in range [0, 1].
missingvalue : value to be considered as missing value; by default it is NAN (for ‘oph_double’ and ‘oph_float’).

Return type

Binary-array.

Examples

Compute the mean on 30 measures.

oph_reduce('OPH_DOUBLE','OPH_DOUBLE',measure,'OPH_AVG',30)

Operation type

Reduce.

Argument name	Type	Mandatory	Values	Default	Min/Max-value	Min/Max-times
input measure type	“oph_type”	“yes”	“‘oph_double’\|’oph_float’\|’oph_int’\|’oph_long’\|’oph_short’\|’oph_byte’”			“1” / “1”
output measure type	“oph_type”	“yes”	“‘oph_double’\|’oph_float’\|’oph_int’\|’oph_long’\|’oph_short’\|’oph_byte’”			“1” / “1”
measure	“binary-array”	“yes”				“1” / “1”
operator name	“oph_operator”	“no”	“‘oph_count’\|’oph_max’\|’oph_min’\|’oph_avg’\|’oph_sum’\|’oph_std’\|’oph_var’\|’oph_cmoment’\|’oph_acmoment’\|’oph_rmoment’\|’oph_armoment’\|’oph_arg_max’\|’oph_arg_min’”	“‘oph_max’”		“0” / “1”
count	“long-long”	“no”		“0”	“array length” / “array length”	“0” / “1”
order	“double”	“no”		“2”		“0” / “1”
missingvalue	“double”	“no”	“NAN”			“0” / “1”