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Re: is there a command in IDL like bitget command in matlab? [message #49060]

Tue, 13 June 2006 21:56

mmeron
Messages: 44
Registered: October 2003

Member

In article <zzbatmos-A42A7E.23210713062006@news.tamu.edu>, zzbatmos <zzbatmos@tamu.edu> writes:
> Hi all,
> Does anyone know that whether there is command in IDL to get the value
> of a bit in a integer, just like the bitget command in MATLAB?
>
You can use AND for this purpose. For bit #n (count starts at zero)
of integer x do

bit = (x and 2^n)/2^n

more generally you can generate an array, say for 32 bits, by

arr = 2l^(lindgen(32))

and get all the bits of a given integer by doing

res = (x and arr)/arr

Mati Meron | "When you argue with a fool,
meron@cars.uchicago.edu | chances are he is doing just the same"

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