validate_ppd

validate_ppd#

stimupy.utils.validate_ppd(ppd)#

Put specification of ppd in canonical form, if possible

Parameters:

ppd (Sequence of length 1 or 2; or None) – if 2 elements: interpret as (vertical, horizontal) if 1 element: use as both vertical and horizontal if None: return (None, None) each element has to be of type that can be cast to int, or None.

Returns:

.vertical: int, vertical pixels per degree (ppd) .horizontal: int, horizontal pixels per degree (ppd)

Return type:

ppd NamedTuple, with two attributes

Raises:

  • ValueError – if input does not have at least 1 element

  • TypeError – if input is not a Sequence(int, int) and cannot be cast to one

  • ValueError – if input has more than 2 elements

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