On 03:27 PM 1/06/2001 -0700, Peter Bennett said:
>Brad Velander wrote:
> >
> > Dave,
> > I normally don't use this feature but tested it after your message.
> > It definitely doesn't work properly. I could get '>' or '<' to work pretty
> > good as far as I could tell on my design. I could not get '=' to work
> at all
> > for any hole size. I also got '<>' to work on my design. So it does work to
> > a certain degree. Actually it seems anything utilizing any function other
> > than '=' works.
>
>That sounds like a common programming problem with floating point
>numbers - you can't reliably compare them for equality, as the values of
>supposedly equal numbers can vary by .000000001, so they are not
>"equal", but show the same value when displayed at reasonable precision.
>
>--
>Peter Bennett
Peter is right - what you need to do is set up the selection to select all
holes greater than the hole size minus a small amount and less than the
hole size plus a small amount.
I suppose Protel could improve this equality testing by adding a "delta"
option to the select dialog - much like the aperture match option used for
the old apt file based gerbers.
I think there may be a Protel KB article covering this issue.
Ian Wilson
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