Try this (NOTE NiceSlice syntax):
$mask = ($a != $a->range(-1,$a->dim(0),'e'));
$mask->(0) .= 1;
$ui = which($mask);
Still somewhat inefficient but at least it's not computing an open product...
> On May 5, 2015, at 5:13 PM, Trevor Carey-Smith
> <[email protected]> wrote:
>
> Hi,
>
> I am using uniqind() but I need it to return the index of the *first*
> unique value. As it is the function returns a seemingly random index:
>
> pdl> $a=pdl(1,2,2,2)
> pdl> p $a->uniqind
> [0 1]
> pdl> $b=pdl(1,2,2,2,2)
> pdl> p $b->uniqind
> [0 2]
>
> Can anyone provide an efficient way of doing this?
>
> I have come up with a convoluted method that does not scale well (when
> the vector is large and has many non-unique values):
>
> pdl> $tmp=$b->uniq->(*1)->minus($b,0) == 0
> pdl> p $tmp->mult(xvals($tmp)+1,0)->setvaltobad(0)->minimum->minus(1,0)
> [0 1]
>
> My PDL version is old (v2.4.7), but it is installed on a server and they
> would rather avoid upgrades...
>
> Thanks for any help,
> Trevor.
>
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