__init__(self, a, b, ignore_fields=[], numdiffs=10, rtol=0.0, atol=0.0)
An HDU object.
An HDU object to compare to the first HDU object.
The (case-insensitive) names of any table columns to ignore if any table data is to be compared.
The number of pixel/table values to output when reporting HDU data differences. Though the count of differences is the same either way, this allows controlling the number of different values that are kept in memory or output. If a negative value is given, then numdiffs is treated as unlimited (default: 10).
The relative difference to allow when comparing two float values either in header values, image arrays, or table columns (default: 0.0). Values which satisfy the expression
$$\left| a - b \right| > \text{atol} + \text{rtol} \cdot \left| b \right|$$are considered to be different. The underlying function used for comparison is numpy.allclose
.
The allowed absolute difference. See also rtol
parameter.
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