PK_ATTRIB_ask_named_doubles

PK_ERROR_code_t PK_ATTRIB_ask_named_doubles
(
--- received arguments ---
PK_ATTRIB_t     attrib,             --- attribute
const char     *field_name,         --- field name

--- returned arguments ---
int      *const n_doubles,          --- number of doubles (>=0)
double  **const doubles             --- doubles (optional)
)


This function returns the array of doubles from field 'field_name'
of the given attribute.


Specific Errors:
    PK_ERROR_bad_name               The attribute does not have a field with
                                    this name
    PK_ERROR_field_of_wrong_type    The field is not a double field


The output array 'doubles' is optional.  If it is set to NULL, the function
will only return the number of doubles in the field.

See Attribute processing for more information.

See Using named fields for information using named attributes.