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--- transformations:iteratetable [2016/09/20 22:56] – created dmitry
+++ transformations:iteratetable [2021/06/06 23:47] – craigt
@@ Line 1: / Line 1: @@
-===== Iterate table =====
+{{ transformations:IterateTableAction.png}}
+====== ITERATE TABLE ======
+Category: Workflow / Internal \\
+\\
+=====Description=====
+This action is similar to [[transformations:iterate|Iterate]] action, but allows passing a table to an iterated project. //Iterate table// has two inputs:
+   - The output of the previous action
+   - The external table passed into the called module/project (referenced in the Action settings)
+This action works as follows: It takes a dataset from another table (input #2, above), passes it to the called module or project, and runs it as many times as there are rows in the input dataset (input #1, above).
+The iterated module/project should use the [[transformations:input|Input]] action to receive the external table.\\
+\\
+=====Use cases=====
+This action is helpful when multiple calculations with different parameters have to be performed on the same dataset (e.g. financial stress testing).\\
+\\
+=====Action settings=====
+^Setting^Description^
+|Module/Project to run<sup>*</sup>|Select whether to call a module (within the current project), or an external project (.morph file), then select the\\ module, or browse to the project file.|
+|Column name|Enter the name that will be assigned to all columns as they are passed to the called module.|
+|Mode|Choose whether to just iterate the called module (or project) and //not// return any results, or iterate and return\\ columns.  Options:  //Iterate, ignore results// or //Iterate, append result columns// (and select the Result table from\\ the called module or project; returned columns will be appended side-by-side).|
+|Assign parameters|Select the parameter(s) in the called module (or project) to pass values in through, and enter the associated value(s)<sup>*</sup> (can be a column, text/number, or parameter).|
+|Exclude selected columns|Check to exclude selected columns from being iterated. Select the columns to be skipped and not be sent to the called module.|
+<sup>*</sup> Setting can be specified using a [[:parameters|parameter]].\\
+\\
+=====Remarks=====
+This action provides significantly increased performance in cases when the iterated project needs to operate with the same dataset in each iteration.\\
+\\
+=====Examples=====
+**Mode:  Iterate** — do not return anything from the iterated module, i.e. just run it one or several times. (top image, below)\\
+{{  https://easymorph.com/images/learn/iterate-mode3.png  }}
+**Mode:  Iterate and append results** — run the module one or several times, return a table (the result dataset) from each iteration, and append all result datasets into one, which becomes the output of the "Iterate table" action. (bottom image, above)\\
+\\
+=====More examples=====
+  * [[https://community.easymorph.com/t/create-a-new-table-with-columns-based-on-row-values/1625/3|Community: Create a new table with columns based on row values]]
+  * [[https://community.easymorph.com/t/crosstable-multiple-column-groups/1249|Community: Crosstable multiple column groups]]
+\\
+=====See also=====
+  * [[transformations:input|Input]]
+  * [[transformations:iterate|Iterate]]
+  * [[transformations:iteratecolumns|Iterate column]]
+  * Read [[http://easymorph.com/learn/iterations.html|Iterations and loops in EasyMorph]] for more details regarding this action.
-This transformation is similar to [[transformations:iterate|Iterate]] transformation, but allows passing a table to an iterated project. The iterated project should use [[transformations:input|Input]] transformation in order to receive the table.
-This transformation allows significantly increasing performance in cases when iterated project had to read the same file in each iteration (in previous versions of EasyMorph). Now such file can be read once and then passed to an iterated project in memory.