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--- manual:chapter6:stack:cmd_drop2 [2019/10/18 14:22]
jojo1973 created
+++ manual:chapter6:stack:cmd_drop2 [2019/11/28 14:52] (current)
jojo1973 Added flags -28 and -29
@@ Line 8: / Line 8: @@
 <callout color="green" icon="fa fa-indent" title="Stack Diagram">
 ----
-^  __Input Stack__  ^  ^  __Output Stack__  ^
+^  __Input Stack__  ^^  ^  __Output Stack__  ^
 |  **O<sub>2</sub>**  |  **O<sub>1</sub>**  |  **→**  |  |
-|  //Level 2//  |  //Level 1//  |  **→**  |  //Level 1//  |
+|  //Level 2//  |  //Level 1//  |  //→//  |  //Level 1//  |
 {{page>manual:chapter6:aux:legend&nofooter&noeditbtn&inline}}
-|**Type**| [[manual:chapter5:basics#operators|Command]]  ||
+|**Type**| [[manual:chapter5:basics#commands|Command]]  ||
 |**Parallel list processing**| [[manual:chapter5:listproc#group-2commands-that-must-use-dolist-to-parallel-process|Group 2]]  ||
-|**Affected by flags**| None  ||
+|**Affected by flags**|  [[manual:appendix:flags#flag-28|-28]] | RPL / RPN stack mode  |
+|:::|  [[manual:appendix:flags#flag-29|-29]] | RPN stack depth  |
 </callout>
 <callout color="orangered" icon="fa fa-comment" title="Description">
 ----
-The ''DROP2'' command deletes two objects on the top two levels of the stack, letting the remaining ones to drop two places.
+The ''DROP2'' command deletes the top two objects on the stack, shifting the remaining ones by two levels.
+When the stack is in RPN mode ''DROP2'' fills immediately the two bottom-most level of the stack (levels 3/4 or levels 7/8, depending on the selected stack depth) with the value stored in the bottom-most level 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>