oph_reduce3¶

Description¶

Behaviour

It reduces a measure array performing the specified operation on blocks of elements (aggregation sets). Aggregation sets are listed as binary array of long long and can be of different sizes.

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.
binary count list: binary array of long long counters representing block dimensions.
block size: product of the dimensions that varies more quickly than the dimension to be reduced.
size: size of the dimension 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

Reduces a measure array computing the mean on groups of elements as specified in count_list with the internal dimension of size 15 and the external to-be-reduced one of size 10.

oph_reduce3('OPH_DOUBLE','OPH_DOUBLE',measure,'OPH_AVG',count_list,15,10)

Operation type

Reduce.

Arguments¶

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_armo ment’\|’oph_arg_max’\|’oph_arg_min’”	“‘oph_max’”		“0” / “1”
binary count list	“binary-array”	“no”		“array length”		“0” / “1”
block size	“long-long”	“no”		“1”	“array length” / “array length”	“0” / “1”
size	“long-long”	“no”		“0”	“array length” / “array length”	“0” / “1”
order	“double”	“no”		“2”		“0” / “1”
missingvalue	“double”	“no”	“NAN”			“0” / “1”