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--- how_to:recomputeretentiontime [2010/08/03 15:07]
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+++ how_to:recomputeretentiontime [2010/08/04 12:10] (current)
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@@ Line 3: / Line 3: @@
 See [[userguide:retentiontimerecomputing|Retention Time Recomputing principles]] if needed.
-:!: **If you recompute retention time for a given User context, it will not automatically recompute retention time for child contexts (i.e. contexts under the selected context if exist). At present, you need to recompute retention time of all your context tree 'manually'. No specific order is needed as final child species are used.**
+:!: **If you recompute retention time for a given User context, it will not automatically recompute retention time for child contexts (i.e. contexts under the selected context, if exist).\\
+:!: At present, you need to recompute retention time of all your context tree 'manually'. For that, no specific order is needed as final child species are used.**
 ===== Run the Retention Time Recomputing algorithm =====
 {{ :how_to:rtrecomputingmenu.png |}}
+:!: **Required conditions to run the Retention Time Recomputing algorithm:**
+  * **Selected User context must be grouped**
+  * **Protein Grouping on the selected User context must be saved to MSIdb**
+If above conditions are respected, then follow these steps:
   - Select the User context for which you want to recompute retention time
+  - To display the settings dialog:
+      * Right-click on the selected context and select Algorithms→Retention Time→Retention Time Recomputing
+      * Or, from the main toolbar, select MS Identifications→Context→Algorithms→Retention Time→Retention Time Recomputing
   - Go to the ''MS Identifications→Context→Algorithms→Retention Time Recomputing'' to display settings dialog
   - Change algo settings options (see below) if needed and click the ''Ok'' button
-===== Algo settings options =====
+===== Algo settings options (default options are generally optimal) =====
 On top of the dialog, is displayed the User context to process.

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