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--- en:software:qview:qview_6:qview60 [2015/04/28 15:47] – [3.11.1. Variabili Statiche] qem207
+++ en:software:qview:qview_6:qview60 [2015/04/28 16:06] – [3.11.2. Indexed Variables] qem207
@@ Line 560: / Line 560: @@
 ^Recipe 100| | | |
+==== - Indexed Variables ====
+<code QCL>
+DATAGROUP
+  <DataGroup Name>
+  DATAPROGRAM
+    <number of recipes>
+  STEP
+    <number of steps>
+;Indexed variables declaration
+    <variable name> <F/B/W/L/S>
+    <variable name> <F/B/W/L/S>
+    <variable name> <F/B/W/L/S>
+</code>
+Indexed variables reside in DATAGROUP subsector named STEP. Their function is to introduce for each recipe, the concept of step. The first value of this sector is a number or an integer constant, and represents the number of steps for each recipe in archive. Indexed variables are to be considered as containers of a list of values for each recipe, and are accessed as a 2-dimensional array, where the first value is the number of the recipe, the second the number of desired step. Example:
+<code QCL>
+DATAGROUP
+  Name
+  DATAPROGRAM
+;Static variables declaration
+    Variable1     L
+    Variable2     S
+    Variable3     F
+  STEP
+;Indexed variables declaration
+    Variable4     W
+    Variable5     B
+</code>
+To refer to variable //Variable4// in recipe 5 to step 9, the used code is:
+<code QCL>
+Variable4[5, 9]
+</code>
+We can imagine the memory structure of a variable DATAGROUP, in our example with static and indexed variables, as the following table:
+^ ^  Variable1  ^  Variable2  ^  Variable3  ^  Variable4  ^^^^^  Variable5  ^^^^^
+^Recipe 1| | | | | | | | | | | | | |
+^:::|:::|:::|:::| | | | | | | | | | |
+^Recipe 2| | | | | | | | | | | | | |
+^:::|:::|:::|:::| | | | | | | | | | |
+^Recipe 3| | | | | | | | | | | | | |
+^:::|:::|:::|:::| | | | | | | | | | |
+^...| | | | | | | | | | | | | |
+^:::|:::|:::|:::| | | | | | | | | | |
+^Recipe 100| | | | | | | | | | | | | |
+^:::|:::|:::|:::| | | | | | | | | | |
+Other informations:
+  * In a DATAGROUP all variables, both static and indexed, are retentive (maintain the value at power off).
+  * The Datagroup variables may be more than one, in this case it is necessary to insert more DATAGROUP keywords.
+  * The subsection DATAPROGRAM is mandatory, while the STEP is optional.
+  * The maximum number of recipes can be set is 65534.
+  * The maximum number of steps can be set is 65534.
+  * Compared to a common array, static variables can also support a Flag size data (F).
 ===== - DATAGROUP variables old =====
 Datagroup variables are a special data structures. When declaring a datagroup, a part of memory is organised in a table of rows and columns. The columns are called  //programs// or //recipes//, while the rows are //steps//.\\