bjs: >I created a point file from a .csv file. Opened it for exclusive >access, but when I added a column from the modify table/add field it >was read-only. There were no instructions given by me to make >anything read-only: Maptitude decided that on its own. The only fix >was to rebuild the file. I can't figure out why anyone would want to >add a column to a table and not be able to update it.
Since a comma-delimited file has no fixed-size locations for editing data, it is always opened read-only. If you want to have a table that can be edited, you need to convert to a fixed-format file such as dBASE (.DBF), fixed-format ASCII (.ASC) or fixed-format binary (.BIN). If, like a spreadsheet program, Maptitude brought data into memory, cells could be edited and the data saved back to disk. But Maptitude is a database program, and works with the original data on disk so if, for example, you wanted to replace five characters in a cell with six, the string would not fit. That is why comma-delimited files (.CSV or .TXT) are opened read-only. Peter ---------------------------------------------------------------- Peter Van Demark Director of GIS Products and Training Phone: 617-527-4700 Caliper Corporation Fax: 617-527-5113 1172 Beacon Street E-mail: [EMAIL PROTECTED] Newton MA 02461-9926 Web site: http://www.caliper.com ------------------------ Yahoo! Groups Sponsor --------------------~--> In low income neighborhoods, 84% do not own computers. At Network for Good, help bridge the Digital Divide! http://us.click.yahoo.com/EA3HyD/3MnJAA/79vVAA/C5grlB/TM --------------------------------------------------------------------~-> Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Maptitude/ <*> 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/
