Hi Armando -- Thanks for your insight. While I had a little trouble implementing your steps verbatim, your method did spark some ideas on how to apply a theme to a selection set without needing to create a new database.
In anycase, here's what I did: 1.) Create a new field based on a conditional formula. (The method for doing this is outlined in the "Combining Formulas and Conditions" in the help file). This will eliminate the selection set's complement in a defacto manner by populating the field with a missing value if the condition is not met. 2.) Apply the theme to the new field. (I was fortunate in this case because my selection set was defined according to values of a non-geographic variable. I'm not sure how well this method would work if the selection set were based on a geographic criterion.) It turns out that saving the map is sufficient for preserving the conditionally formatted theme, which is nice because it eliminates the need to create and manage extra files. Moreover, it automatically calculates the quantile cutoff points for just those records in the pseudo-selection set. Anyways, just thought I'd share... Thanks again! ~Dan --- In [email protected], "Armando Scalise" <[EMAIL PROTECTED]> wrote: > > This worked for me some time ago > > 1) Add a field to the dataview of your layer called THEMEFILED (or any name > that makes sense to you) > > 1) Display your selection set in a dataview (make sure you only display > the selections et on which you want to create a theme) > > 2) Fill the THEMEFIELD with a formula. in the formula enter the name of > the filed you want to use int the theme. > > 3) take note of the minimum and maximum values on that field (sort by > THEMFIELD) > > 4) Open the theme tool - Create a theme by THEMEFIELD , in the ignore > minimum and maximum values fields, enter the one sin your dagta set. > > Hope this helps > > On Thu, Oct 23, 2008 at 7:48 PM, dpdifran <[EMAIL PROTECTED]> wrote: > > > Hello, > > > > I was wondering if anyone knows of a way to apply a theme to (and > > only to) a selection, without exporting to a separate layer and/or > > changing the underlying database. Many of the old posts contain good > > instructions for accomplishing this by applying a theme to a full > > set of data, and hiding the complement of the selection -- however, > > while these techniques are useful for fine-tuning a map's display, > > it seems that the quantile structure on which the classes are based > > still takes into account the full set of data. > > > > Ideally, the method I'm looking for would omit all data that fall > > outside the selection set from the population according to which the > > quantiles are calculated. I imagine that it wouldn't be terribly > > difficult to work around this issue by creating classes manually, > > but I'd thought I'd see if anyone had ideas, as this is a function I > > perform fairly often...any insight would be much appreciated! > > > > Thanks, > > ~Dan > > > > > > > > > > -- > Armando Scalise > ------------------------------------ Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Maptitude/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/Maptitude/join (Yahoo! ID required) <*> To change settings via email: mailto:[EMAIL PROTECTED] mailto:[EMAIL PROTECTED] <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
