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calculate_r_expression [2026/07/22 18:13]
hermann 		calculate_r_expression [2026/08/18 02:29] (current)
hermann
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 ^ Name ^ Type ^ Description ^ ^ Name ^ Type ^ Description ^
-| Expression | [[ego_script#​constants|Code]] | The expression that will run on R. ''​Code''​ values cannot be written ​as plain text constants in EGO Script ​— see [[#​writing_the_expression_in_ego_script|Writing the expression in EGO Script]] below. |+| Expression | [[code_type|Code]] | The expression that will run on R. Written directly ​as a Code constant using its own raw string syntax ​— see [[#​writing_the_expression_in_ego_script|Writing the expression in EGO Script]] below. |
 | Treat Warning As Errors | [[Boolean Value Type]] | Warnings raised by the R script will be treated as errors. | | Treat Warning As Errors | [[Boolean Value Type]] | Warnings raised by the R script will be treated as errors. |
  
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 ==== Writing the expression in EGO Script ==== ==== Writing the expression in EGO Script ====
  
-Like [[calculate_python_expression|Calculate Python Expression]],​ the ''​Expression''​ input is type [[ego_script#​constants|Code]], which is represented ​in the underlying script using base64 encoding — impractical to write or edit directly as a text constant. Instead, connect a ''​String''​ carrier functor containing the R expression text to the ''​Expression'' ​port; its output is accepted wherever a ''​Code''​ value is expected. Since only this one output ​is needed, ​the carrier can be [[ego_script#​inline_syntax|inlined]] directly into the call. +Like [[calculate_python_expression|Calculate Python Expression]],​ the ''​Expression''​ input is type [[code_type|Code]]. It can be filled ​in directly as a text constant, ​using Code Type's own raw string syntax — the same ''​$"<​delimiter>​( raw_characters )<​delimiter>"​'' ​form used by String constants. This is also the form the Dinamica EGO GUI's dedicated code editor ​generates when it writes ​the ''​Expression'' ​port'​s ​value, so a hand-written script and one produced by the GUI take the same shape. See [[code_type|Code Type]] for the full grammar, including the base64 alternative form.
- +
-This limitation is specific to hand-written EGO Script. In the Dinamica EGO GUI, the ''​Expression''​ port has a dedicated code editor ​that edits the ''​Code''​ value directly — the ''​String''​ carrier workaround is only necessary when writing or editing ​the ''​.ego''​ file as text.+
  
 <​code>​ <​code>​
-result := CalculateRExpression ​(String ​$"(+result := CalculateRExpression $"(
 aboveThreshold <- t1$Value >= v1; aboveThreshold <- t1$Value >= v1;
 outputLookupTable("​filteredPatches",​ t1$Key[aboveThreshold],​ t1$Value[aboveThreshold]);​ outputLookupTable("​filteredPatches",​ t1$Key[aboveThreshold],​ t1$Value[aboveThreshold]);​
-)") .no {{+)" .no {{
     NumberTable landCoverAreas 1;     NumberTable landCoverAreas 1;
     NumberValue minimumArea ​   1;     NumberValue minimumArea ​   1;
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 CalculateRExpression CalculateRExpression
 +