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--- manual:chapter6:stack:cmd_drop [2019/09/17 16:39]
jojo1973 Tweaks
+++ manual:chapter6:stack:cmd_drop [2019/11/28 14:44] (current)
jojo1973 Added flags -28 and -29
@@ Line 1: / Line 1: @@
 ==== DROP ====
 ----
-<callout color="crimson" icon="fa fa-indent" title="Stack Diagram">
+<callout type="primary" color="" icon="fa fa-book" title="Synopsis">
+----
+Remove one object from the top of the stack
+</callout>
+<callout color="green" icon="fa fa-indent" title="Stack Diagram">
 ----
 ^  __Input Stack__  ^  ^  __Output Stack__  ^
 |  **O**  |  **→**  |  |
-|  //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#commands|Command]]  ||
-| {{fa>times?lg&color=red}} **Support for parallel list processing**  |
+|**Parallel list processing**| [[manual:chapter5:listproc#group-2commands-that-must-use-dolist-to-parallel-process|Group 2]]  ||
-| {{fa>times?lg&color=red}} **Affected by flags**  |
+|**Affected by flags**|  [[manual:appendix:flags#flag-28|-28]] | RPL / RPN stack mode  |
+|:::|  [[manual:appendix:flags#flag-29|-29]] | RPN stack depth  |
 </callout>
-<callout type="primary" color="" icon="fa fa-comment" title="Description">
+<callout color="orangered" icon="fa fa-comment" title="Description">
 ----
-This command will remove one object from the top of the stack.
+The ''DROP'' command deletes the object on the top of the stack, shifting the remaining ones by one level.
+When the stack is in RPN mode ''DROP'' fills immediately the bottom-most level of the stack (level 4 or level 8, depending on the selected stack depth) with the value it stored before the shift happened.
 </callout>
-<callout type="success" icon="true" title="Compatibility">
+<callout type="warning" icon="true" title="Compatibility">
 ----
-This command is fully compatible with userRPL.
+This command is only partially compatible with userRPL.
+In particular:
+  * In userRPL RPN stack mode is not supported.
 </callout>
 <callout type="info" icon="true" title="Usage">
 ----
-The following program:
 <code>
-  « 123 456 789 DROP »
+:            "This is a string"
+:               { 'X' 'Y' 'Z' }
+:                           1_m
+……………………………………………………………………………………
+DROP
+</code>
+will result in
+<code>
+:            "This is a string"
+:               { 'X' 'Y' 'Z' }
+……………………………………………………………………………………
 </code>
-leaves ''123'' and ''456'' on the stack.
 </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>