Ahhh !!!!! Of course! Now the light dawns. I understand now.
Thanks for the explanation Andrew. LINDEN DOYLE Product Development Engineer Zener Electric Pty Ltd [EMAIL PROTECTED] Ph: +61 2 9795 3600 Fax: +61 2 9795 3611 -----Original Message----- From: Andrew Jenkins <[EMAIL PROTECTED]> To: Protel EDA Forum <[EMAIL PROTECTED]> Date: Thursday, 7 March 2002 02:59 Subject: Re: [PEDA] Query MAnager >On 02:17 PM 3/7/2002 +1100, Linden Doyle wrote: > >>Hi All, >> >> > >> >IMHO it would be MUCH more useful if it offered true LOGICAL AND >> >functions instead of the LOGICAL OR functions that it uses >> > >> >>Maybe I've got hold of the wrong end of the stick here, but I thought it >>already did an "AND" function. >> >>For example, I just wrote a query that selected: >> all pads with holes = 32thou AND >> all components with comment = 4u7 AND >> all fills on the Top Overlay layer. >>(Not useful but it demonstrates my point) >>Hit APPLY and all three object types are selected. > > >If I understood your post correctly, AND results in ANY object having the above characteristics being displayed. > >However, a True logical AND query (by definition) would result in only the _intersection_ of the three categories above, ie, only pads with 32mil holes, that are ALSO 4uF, AND are ALSO fills on the top layer. >(example is kinda moot, since pads don't generally have 4uF of capacitance, nor are pads fills...) > >Anyway...In a true logical AND query, all other objects would be dismissed from the query. What you have described (as I understood your post) is instead a logical OR query, not a logical AND query. That is, the result is true (display the object) if it is EITHER a pad with a 32 mil hole, OR 4uF, OR a fill on the top overlay. > >aj > * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * To post a message: mailto:[EMAIL PROTECTED] * * To leave this list visit: * http://www.techservinc.com/protelusers/leave.html * * Contact the list manager: * mailto:[EMAIL PROTECTED] * * Forum Guidelines Rules: * http://www.techservinc.com/protelusers/forumrules.html * * Browse or Search previous postings: * http://www.mail-archive.com/[email protected] * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
