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--- manual:chapter6:stack:cmd_stkpush [2019/10/09 09:41]
claudio
+++ manual:chapter6:stack:cmd_stkpush [2019/10/19 14:45]
jojo1973
@@ Line 1: / Line 1: @@
 ==== STKPUSH ====
 ----
-<callout type="primary" color="" icon="fa fa-comment" title="Description">
+<callout type="primary" color="" icon="fa fa-book" title="Synopsis">
 ----
-Push a snapshot of the current stack to level 1 on the "stack of stacks".
+Push a snapshot of the current stack on the Undo stack
 </callout>
-<callout color="crimson" icon="fa fa-indent" title="Stack Diagram">
+<callout color="green" icon="fa fa-indent" title="Stack Diagram">
 ----
 ^  __Input Stack__  ^  ^  __Output Stack__  ^
-|    |  **→**  |  |
+|  |  **→**  |  |
-|  //Level 1//  |  **→**  |  //Level 1//  |
+|  //Level 1//  |  //→//  |  //Level 1//  |
 {{page>manual:chapter6:aux:legend&nofooter&noeditbtn&inline}}
-| {{fa>times?lg&color=red}} **Support for inclusion in symbolic expressions**  |
+|**Type**| [[manual:chapter5:basics#operators|Command]]  ||
-| {{fa>times?lg&color=red}} **Support for parallel list processing**  |
+|**Parallel list processing**| [[manual:chapter5:listproc#group-1commands-that-cannot-parallel-process|Group 1]]  ||
-| {{fa>times?lg&color=red}} **Affected by flags**  |
+|**Affected by flags**| None  ||
 </callout>
-<callout type="warning" icon="fa fa-thumbs-down" title="Compatibility">
+<callout color="orangered" icon="fa fa-comment" title="Description">
 ----
-This command is new in newRPL, does not exist in userRPL.
+The ''STKPUSH'' command creates a snapshot of the stack and pushes it on the top of the Undo stack. The Undo stack may contain up to 8 snapshots: each time a ninth is pushed on it, the snapshot on level 8 is lost.
+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 already pushed on the Undo stack: the only effect of ''STKPUSH'' would be to duplicate the latest 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:
+The following program
 <code>
 « 123
@@ Line 35: / Line 42: @@
 »
 </code>
-leaves an empty stack, and when pressing Undo (**LF** cursor while at the stack) the numbers 123, 456, 789 will appear on the stack.
+leaves an empty stack. If **LF** is pressed, the previous stack will be restored.
+<code>
+:                           123
+:                           456
+:                           789
+……………………………………………………………………………………
+</code>
 </callout>
-<callout color="darkslategray" icon="fa fa-hand-o-right" title="Related Commands">
+<callout color="darkgray" icon="fa fa-hand-o-right" title="Related Commands">
+----
 {{page>manual:chapter6:stack&nofooter&noeditbtn&inline}}
 </callout>