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# pandas.Index.asof_locs¶

Index.asof_locs(where, mask)[source]

Finds the locations (indices) of the labels from the index for every entry in the where argument.

As in the asof function, if the label (a particular entry in where) is not in the index, the latest index label upto the passed label is chosen and its index returned.

If all of the labels in the index are later than a label in where, -1 is returned.

mask is used to ignore NA values in the index during calculation.

Parameters: where : Index An Index consisting of an array of timestamps. mask : array-like Array of booleans denoting where values in the original data are not NA. numpy.ndarray An array of locations (indices) of the labels from the Index which correspond to the return values of the asof function for every element in where.
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