Differences

This shows you the differences between two versions of the page.

--- parameters [2015/05/19 19:10] – dmitry
+++ parameters [2015/05/19 19:29] – dmitry
@@ Line 2: / Line 2: @@
 (available from version 1.6)
-Parameters can be used to parametrize project calculation (e.g. file names, dates, multipliers and ratios in expressions, etc.).
+Parameters can be used to parametrize transformations and expressions instead of file names in export/import transformations and instead of constants in expressions (e.g. multipliers and ratios). See [[syntax:|expression syntax]] for using parameters in expressions.
+Parameters are global for a project, which means that they are available for all tables. Value of a parameter is the same for all tables. Changing a parameter value doesn't automatically discard transformation results, but all new calculations will use the new value (where applicable).
 === Parameter editor ===
@@ Line 12: / Line 14: @@
   * **File name** - this parameter type is just like a text parameter but for convenience the input box has buttons for opening file browser and triggering absolute/relative paths
   * **Date** - it's a number parameter that supposed to indicate a date that can be chosen using a date picker (calendar)
-  * **Calculated parameter** can be calculated using [[syntax:start|expressions]]. Although some restrictions apply -- expressions used for calculated parameters can't have field names and other calculated parameters.
+  * **Calculated parameter** can be calculated using [[syntax:start|expressions]]. Although some restrictions apply -- expressions used for calculated parameters can't have field names and other calculated parameters. Calculated parameters are evaluated automatically before running a project or calculating a transformation.
 === Full project runs ===