| Re: find positions in vectors [message #62030] |
Thu, 21 August 2008 01:47  |
thomas.jagdhuber@dlr.
Messages: 19
Registered: February 2007
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Junior Member |
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On 21 Aug., 09:11, Craig Markwardt
<craigm...@REMOVEcow.physics.wisc.edu> wrote:
> "thomas.jagdhuber" <thomas.jagdhu...@gmail.com> writes:
>> On 20 Aug., 22:16, Jeremy Bailin <astroco...@gmail.com> wrote:
>>> On Aug 20, 4:01 pm, "thomas.jagdhuber" <thomas.jagdhu...@gmail.com>
>>> wrote:
>
>>>> Dear experts,
>
>>>> another question:
>
>>>> I have two vectors (simplified):
>
>>>> a= [1,2,3,4,5,6,7,8]
>>>> b=[2,5,7]
>
>>>> now I want to find the positions in the vector a which contains no
>>>> values of b. I know that it is working with the histogram-function.
>>>> And I can do it for integers, but in reality my values are floats
>>>> between 0.0 and 50.0. and that is the point where I got problems!
>
>>>> Best wishes,
>
>>>> thomas
>
>>> I always use Craig's CMSET_OP for that sort of thing:
>
>>> http://cow.physics.wisc.edu/~craigm/idl/arrays.html
>
>>> -Jeremy.
>
>> actually this is working now. perfect, thanks a lot! I have the values
>> now. Next problem: Is there an elegant method to find now the position
>> of each value of b (which is not contained in the vector a) inside the
>> vector b. Because the where-function can only be used for one value,
>> which ends up in using a for loop over the values of b.
>
> Do you mean, like,
> cmset_op(a, 'AND', /not2, b, /index)
> ??
>
> :-)
>
> Craig
>
> --
> ------------------------------------------------------------ --------------
> Craig B. Markwardt, Ph.D. EMAIL: craigm...@REMOVEcow.physics.wisc.edu
> Astrophysics, IDL, Finance, Derivatives | Remove "net" for better response
> ------------------------------------------------------------ --------------
Sorry, stupid! thanks a lot ,this is really elegant!!!
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