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Re: find positions in vectors [message #62034 is a reply to message #62033]

Wed, 20 August 2008 23:25

thomas.jagdhuber@dlr. is currently offline

thomas.jagdhuber@dlr.
Messages: 19
Registered: February 2007

Junior Member

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.

greets,

thomas

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[Message index]

		Re: find positions in vectors By: thomas.jagdhuber@dlr. on Thu, 21 August 2008 01:47
		Re: find positions in vectors By: Craig Markwardt on Thu, 21 August 2008 00:11
		Re: find positions in vectors By: thomas.jagdhuber@dlr. on Wed, 20 August 2008 23:25
		Re: find positions in vectors By: Jeremy Bailin on Wed, 20 August 2008 13:16

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