nbodykit.io.tools¶

Functions

nbodykit.io.tools.get_file_slice(sizes, start, stop)[source]¶

Return the list of file numbers that must be accessed to return data between start and slice, where these indices are defined in terms of the global catalog indexing

Parameters:	sizes (array_like) – the sizes of each file in the file stack start (int) – the global index to begin the slice stop (int) – the global index to stop the slice
Returns:	fnums – the list of integers specifying the relevant file numbers that must be accessed
Return type:	list

nbodykit.io.tools.get_slice_size(start, stop, step)[source]¶

Utility function to return the size of an array slice

Parameters:	start (int) – the beginning of the slice stop (int) – the end of the slice step (int) – the slice step size
Returns:	N – the total size of the slice
Return type:	int

nbodykit.io.tools.global_to_local_slice(sizes, start, stop, fnum)[source]¶

Convert a global slice, specified by start and stop to the corresponding local indices of the file specified by fnum

Parameters:	sizes (array_like) – the sizes of each file in the file stack start (int) – the global index to begin the slice stop (int) – the global index to stop the slice fnum (int) – the file number that defines the desired local indexing
Returns:	local_start, local_stop – the local start and stop slice values
Return type:	int