Re: Getting the index of a vector element with a given value?

[Jaroslav Hajek]

use `indices = find (vec == value)'


2008/7/18 Primoz PETERLIN <address@hidden>:
> Hello again,
>
> Another question. Suppose I have a vector of values, and would want to
> know the indices of the elements of this vector have a given value.
> What is the easiest way to get them? I came up with the following:
>
> function indices = vindex(vec, value)
>  indices = [];
>  for i = 1:length(vec)
>    if (vec(i) == value)
>      indices = [indices, i];
>    endif
>  endfor
>  if (length(indices) == 0)
>    indices = 0;
>  endif
> endfunction
>
> Does anything more general and faster exist already? I am aware of
> find(), which returns the indices of nonzero elements, and index(),
> which performs a similar task on strings (although the latter only
> returns the index of the first element).
>
> TIA, Primož
>
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-- 
RNDr. Jaroslav Hajek
computing expert
Aeronautical Research and Test Institute (VZLU)
Prague, Czech Republic
url: www.highegg.matfyz.cz