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Re: reading slices of FITS files [message #63676]

Wed, 19 November 2008 07:30

wlandsman
Messages: 743
Registered: June 2000

Senior Member

I want something
> that is functionally equivalent to:
>
> dataslice = (readfits(filename))[xslice,*,*]
>
> but faster.

I am not aware of any IDL FITS readers that can do this. The
closest is probably fxread.pro which can read specified columns from a
2-d array, but isn't setup to do 3 dimensions. Note that your speed
improvement may not be large because each pixel requires a separate I/
O operation when the data is non-contiguous. However, it would
certainly help with memory management, and some techniques discussed
here might improve the speed
(http://tinyurl.com/6l6kmw). --Wayne

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