manual:chapter6:stack:cmd_stkpick [newRPL User Manual]

This page is read only. You can view the source, but not change it. Ask your administrator if you think this is wrong.
==== STKPICK ====
----
<callout type="primary" color="" icon="fa fa-book" title="Synopsis">
----
Pick an object from a snapshot in a given level of the Undo stack
</callout>

<callout color="green" icon="fa fa-indent" title="Stack Diagram">
----
^  __Input Stack__  ^^  ^  __Output Stack__  ^
|  **I<sub>snapshot</sub>**  |  **I<sub>level</sub>**  |  **→**  |  **O**  |
|  //Level 2//  |  //Level 1//  |  //→//  |  //Level 1//  |

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

|**Type**| [[manual:chapter5:basics#commands|Command]]  ||
|**Parallel list processing**| [[manual:chapter5:listproc#group-1commands-that-cannot-parallel-process|Group 1]]  || 
|**Affected by flags**| None  ||
</callout>

<callout color="orangered" icon="fa fa-comment" title="Description">
----
The ''STKPICK'' command retrieves an object at a given level from a given snapshot on the Undo stack.

The command has little utility in interactive mode, since each time a command is typed and ''[[manual:chapter6:operators:cmd_ovr_xeq|XEQ]]''ted a snapshot of the stack is pushed on the Undo stack, altering the position of the intended snapshot.
</callout>

<callout type="danger" icon="true" title="Compatibility">
----
This command is new in newRPL and does not exist in userRPL.
</callout>

<callout type="info" icon="true" title="Usage">
----
The following program
<code>
« 10 11 12 13
  STKPUSH
  CLEAR
  "ABC"
  STKPUSH
  CLEAR
  2 3 STKPICK
»
</code>
will ''[[manual:chapter6:stack:cmd_pick|PICK]]'' the third element (level 1 argument) from snapshot on level 2 (Level 2 argument) of the Undo stack, resulting in the number ''11'' being left on the current stack. 
</callout>

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