manual:chapter6:operators:cmd_ovr_eval

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manual:chapter6:operators:cmd_ovr_eval [2019/10/28 15:37]
jojo1973 Added example 		manual:chapter6:operators:cmd_ovr_eval [2019/11/17 08:23] (current)
jojo1973 Highlighted EVAL when used in technical sense
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 ---- ----
 ^  __Input Stack__  ^  ^  __Output Stack__  ^^^ ^  __Input Stack__  ^  ^  __Output Stack__  ^^^
-|  **O<sub>1</sub>**  |  **→**  |  //see list under __Description__//  |||+|  **O**  |  **→**  |  //see list under __Description__//  |||
 |  //Level 1//  |  //→//  |  //Level n//  |  //...//  |  //Level 1//  |  |  //Level 1//  |  //→//  |  //Level n//  |  //...//  |  //Level 1//  | 
  
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 The effect of the evaluation and the resulting output depends on the type of object being evaluated, as summarized by the following list. The effect of the evaluation and the resulting output depends on the type of object being evaluated, as summarized by the following list.
  
-  * **Local Name**: //Recalls// the content of the variable. +  * **Local Name**: ''EVAL'' //recalls// the content of the variable. 
-  * **Global Name**: //Calls// the content of a variable: +  * **Global Name**: ''EVAL'' //calls// the content of a variable: 
-    - a __Name__ is evaluated; +    - a __Name__ is ''EVAL''uated; 
-    - a __Program__ is evaluated;+    - a __Program__ is ''EVAL''uated;
     - a __Directory__ becomes the current directory;     - a __Directory__ becomes the current directory;
     - __other objects__ which are not lists are put on the stack.     - __other objects__ which are not lists are put on the stack.
-  * **Program**: //Enters// each object in the program: +  * **Program**: ''EVAL'' //enters// each object in the program: 
-    - an [[manual:chapter6:dirs:cmd_unquoteid|unquoted]] __Name__ is evaluated;+    - an [[manual:chapter6:dirs:cmd_unquoteid|unquoted]] __Name__ is ''EVAL''uated;
     - a __Keyword__ is ''[[manual:chapter6:operators:cmd_ovr_xeq|XEQ]]''ted;     - a __Keyword__ is ''[[manual:chapter6:operators:cmd_ovr_xeq|XEQ]]''ted;
     - __other objects__ which are not lists are put on the stack.     - __other objects__ which are not lists are put on the stack.
-  * **Symbolic expression**: //Enters// each object in the expression: +  * **Symbolic expression**: ''EVAL'' //enters// each object in the expression: 
-    - a __Name__ is evaluated;+    - a __Name__ is ''EVAL''uated;
     - a __Keyword__ is ''[[manual:chapter6:operators:cmd_ovr_xeq|XEQ]]''ted;     - a __Keyword__ is ''[[manual:chapter6:operators:cmd_ovr_xeq|XEQ]]''ted;
     - __other objects__ which are not lists are put on the stack.     - __other objects__ which are not lists are put on the stack.
-  * **Other objects**: if they are not lists they are put on the stack. +  * **Other objects**: if they are not lists ''EVAL'' puts them on the stack. 
-  * **List**: //Enters// each object in the list: +  * **List**: ''EVAL'' //enters// each object in the list: 
-    - __any object__ is evaluated according above mentioned rules.+    - __any object__ is ''EVAL''uated according above mentioned rules.
          
 As a final step, ''EVAL'' will perform numerical simplification according to the status of flags from [[manual:appendix:flags#flag-70|-70]] to [[manual:appendix:flags#flag-78|-78]]. As a final step, ''EVAL'' will perform numerical simplification according to the status of flags from [[manual:appendix:flags#flag-70|-70]] to [[manual:appendix:flags#flag-78|-78]].
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   * In userRPL, if the argument is a list ''EVAL'' //enters// any object in the list, then:   * In userRPL, if the argument is a list ''EVAL'' //enters// any object in the list, then:
-    - a __Name__ is evaluated; +    - a __Name__ is ''EVAL''uated; 
-    - a __Program__ is evaluated;+    - a __Program__ is ''EVAL''uated;
     - a __Keyword__ is ''[[manual:chapter6:operators:cmd_ovr_xeq|XEQ]]''ted;     - a __Keyword__ is ''[[manual:chapter6:operators:cmd_ovr_xeq|XEQ]]''ted;
     - __other objects__ are put on the stack.     - __other objects__ are put on the stack.
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 </code> </code>
 will perform the following steps: will perform the following steps:
-  - ''CIRCUM'' (a //global name//) is evaluated; +  - ''CIRCUM'' (a //global name//) is ''EVAL''uated; 
-  - ''« TWOPI * »'' (a //program//) is evaluated; +  - ''« TWOPI * »'' (a //program//) is ''EVAL''uated; 
-  - ''TWOPI'', the first object (a //global name//) in the program is evaluated;+  - ''TWOPI'', the first object (a //global name//) in the program is ''EVAL''uated;
   - ''6.28'' (a //real number//) is put on the stack;   - ''6.28'' (a //real number//) is put on the stack;
   - ''[[manual:chapter6:operators:cmd_ovr_mul|*]]'', the second object (a //keyword//) in the program is ''[[manual:chapter6:operators:cmd_ovr_xeq|XEQ]]''ted.   - ''[[manual:chapter6:operators:cmd_ovr_mul|*]]'', the second object (a //keyword//) in the program is ''[[manual:chapter6:operators:cmd_ovr_xeq|XEQ]]''ted.
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 </code> </code>
 will perform the following steps: will perform the following steps:
-  - ''%%'16'%%'' (a //symbolic expression//) is evaluated;+  - ''%%'16'%%'' (a //symbolic expression//) is ''EVAL''uated;
   - ''16'' (a //real number//) is put on the stack;   - ''16'' (a //real number//) is put on the stack;
   - ''[[manual:chapter6:transcendentals:cmd_sqrt|√]]'' (a //keyword//) is ''[[manual:chapter6:operators:cmd_ovr_xeq|XEQ]]''ted.   - ''[[manual:chapter6:transcendentals:cmd_sqrt|√]]'' (a //keyword//) is ''[[manual:chapter6:operators:cmd_ovr_xeq|XEQ]]''ted.
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