==== ΣLIST ====
<callout type="primary" color="" icon="fa fa-book" title="Synopsis">
----
Return the sum of all elements in a list
</callout>

<callout color="green" icon="fa fa-indent" title="Stack Diagram">
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^  __Input Stack__  ^  ^  __Output Stack__  ^
|  **L<sub>data</sub>**  |  **→**  |  **O<sub>sum</sub>**  |
|  //Level 1//  |  //→//  |  //Level 1//  |

{{page>manual:chapter6:aux:legend&nofooter&noeditbtn&inline}}

| **Keyword type**  | [[manual:chapter5:basics#commands|Command]]  ||
| **Parallel list processing capabilities**  | [[manual:chapter5:listproc#group-2commands-that-must-use-dolist-to-parallel-process|Group 2]]  | //Commands that must use //''[[manual:chapter6:lists:cmd_cmddolist|DOLIST]]''// to parallel process//  |
| **Affected by flags**  | //None//  ||














</callout>

<callout color="orangered" icon="fa fa-comment" title="Description">
----
The ''ΣLIST'' command returns the sum of all the elements in **L<sub>data</sub>**, i.e.:
$$ \sum_{k=1}^{n}{data_{k}} $$
The list must not be empty and its elements must be suitable for mutual addition.
</callout>

<callout type="warning" icon="true" title="Compatibility">
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''ΣLIST'' is not fully equivalent to its **userRPL** counterpart.

In particular:

  * in **userRPL** the list must contain at least two elements.
</callout>

<callout type="info" icon="true" title="Usage">
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**__Input__**
<code>
4:                                      
3:                                      
2:                                      
1:                       { 1 'X' '3*Y' }
…………………………………………………………………………………………………………
ΣLIST                                   
</code>
\\
**__Output__**
<code>
4:                                      
3:                                      
2:                                      
1:                             '1+X+3*Y'
…………………………………………………………………………………………………………
                                        
</code>
</callout>

<callout color="darkgray" icon="fa fa-hand-o-right" title="Related Commands">
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{{page>manual:chapter6:lists&nofooter&noeditbtn&inline}}
</callout>