calc_data_sum2d

sherpa.astro.utils.calc_data_sum2d(data, reg=None)

Sum up the data values of a 2D data set.

Parameters:

• data (sherpa.astro.data.DataIMG instance) – The data object to use.

• reg (str, optional) – The spatial filter to use. The default, None, is to use the whole data set.

Returns:

dsum – The sum of the data values that lie within the given region.

Return type:

number

See also

calc_data_sum

Sum up the data values of a data set.

calc_model_sum2d

Sum up the fitted model for a 2D data set.

Notes

The coordinate system of the region filter is determined by the coordinate setting for the data set (e.g. data.coord).

Any existing filter on the data set - e.g. as created by ignore2d or notice2d - is ignored by this function.