evaluate_attr_predicate

function of dascore.io.index.query

source

evaluate_attr_predicate(
    values ,
    name: str ,
    value ,
    units = None,
)-> ‘np.ndarray’

Evaluate one attr selector against values held in memory.

The in-memory twin of build_attr_clause, for values which never reach the index — those an inventory states rather than a file. It takes the same selector shapes and means the same thing by each, so a selector cannot mean one thing for a patch which states the attr and another for a patch the inventory answers for.

Parameters

Parameter	Description
values	The value each row holds; every one of them states something.
name	The attr the selector names, for error messages.
value	The selector, in any shape build_attr_clause accepts.
units	The canonical units the index stores each kind of this attr in, for converting a unit-bearing selector exactly as the index side would. A kind the index knows nothing about is unitless, and a selector carrying units against one is the error it is there.

Returns

A boolean array of the same length as values.