====== How to compare multiple contexts ======

See **[[userguide:contextcomparisons|here]]** for more details about comparison result view and concepts. 

You can compare :
  * an existing parent union context with its children, 
  * or several contexts with a *virtual* parent union

:!: **Activation conditions**: 
  * Selected contexts **must be grouped AND saved** to MSIdb.
  * Selected contexts **must not contain identification that intersect** (if you are interesting by such a possibility, ask your Admin)


===== Compare a context with its children =====  
{{:how_to:comparevirtualmenu_2.png |}}
  - Select the parent context of your choice
  - Right-click and select ''Algorithms > Compare with > All children/Union parent''
  - The comparison window displays the result
  - Select in the droplist the properties (peptide similarity, protein similarity, accession, etc.) you want to compare

===== Compare several contexts with a *virtual* parent union =====
{{:how_to:comparevirtualmenu_1.png |}}

:!: **Warning: use this type of comparison if you are confident about RAM resources of your machine, as all the grouping stuff is done in memory ! If you have any doubt, create your context hierarchy and execute protein grouping previously.**
  - Select the contexts of your choice: at least 2 contexts, may be Search or User contexts (or mixed), not having necesserally a parent/children relation
  - Right-click and select ''Algorithms > Compare with > All children/Union parent''
  - The comparison window displays the result
  - Select in the droplist the properties (peptide similarity, protein similarity, accession, etc.) you want to compare



===== How-to quickly view details about compared protein groups ===== 

{{:userguide:compareviewproteinaction.png|}}