System Command ERASE: Difference between revisions

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The )ERASE command erases the named function(s) or variable(s) in the current workspace. The workspace is not changed on disk unless you )SAVE the workspace. Once a variable or function is )ERASEd it is no longer defined. Attempting to erase a non-existent function or variable returns an error message. )ERASE with no arguments has no effect; to erase everything in the workspace, use the [[System Command Clear|)CLEAR]] command to start a fresh, clear workspace.
The <apll>)ERASE</apll> command ''erases'' or ''deletes'' the named function(s) or variable(s) in the current workspace. The workspace is not changed on disk unless you )SAVE the workspace. Once a variable or function is <apll>)ERASE</apll>d it is no longer defined. Attempting to erase a non-existent function or variable returns an error message. <apll>)ERASE</apll> with no arguments has no effect; to erase everything in the workspace, use the [[System Command Clear|)CLEAR]] command to start a fresh, clear workspace.
==Example==
==Example==
<code>
<apll><pre>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;)vars<br/>
      )vars  
a0 q <br/>
a0 q  
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;pi←3.1415926<br/>
      pi←3.1415926  
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;)fns<br/>
      )fns  
function  function2 <br/>
function  function2  
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;)vars<br/>
      )vars  
a0 pi q <br/>
a0 pi q  
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;⎕vr 'function'<br/>
      ⎕vr 'function'  
&nbsp;&nbsp;&nbsp;&nbsp;∇ function<br/>
    ∇ function  
[1]&nbsp;&nbsp;&nbsp;"this is a function"<br/>
[1]   "this is a function"  
[2]   <br/>
[2]  
&nbsp;&nbsp;&nbsp;&nbsp;∇ 2013 3 13 11 5 38 975 (UTC)<br/>
    ∇ 2013 3 13 11 5 38 975 (UTC)  
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;⎕vr "function2"<br/>
      ⎕vr "function2"  
&nbsp;&nbsp;&nbsp;&nbsp;∇ function2<br/>
    ∇ function2  
[1]  'This is another function'<br/>
[1]  'This is another function'  
[2]   <br/>
[2]  
&nbsp;&nbsp;&nbsp;&nbsp;∇ 2013 3 13 11 6 0 350 (UTC)<br/>
    ∇ 2013 3 13 11 6 0 350 (UTC)
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;)erase<br/>
      )fns  
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;)fns<br/>
function  function2
function  function2 <br/>
      )vars  
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;)vars<br/>
a0 pi q  
a0 pi q <br/>
      )ERASE function2 pi  
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;)erase function2 pi<br/>
      )fns  
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;)fns<br/>
function
function <br/>
      )vars  
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;)vars<br/>
a0 q  
a0 q <br/>
      )ERASE q f
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;)erase q f <br/>
NOT ERASED:  f  
NOT ERASED:  f<br/>
      )vars  
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;)vars<br/>
a0  
a0  
</code>       
</pre></apll>       
<br><br>'''See also: [[System_Function_EX|Quad EX or ⎕EX]]'''
 
<br><br>
{{Commands}}
{{Commands|ERASE}}
[{article footer}}
{{article footer|0|NO}}

Latest revision as of 15:22, 13 October 2019

The )ERASE command erases or deletes the named function(s) or variable(s) in the current workspace. The workspace is not changed on disk unless you )SAVE the workspace. Once a variable or function is )ERASEd it is no longer defined. Attempting to erase a non-existent function or variable returns an error message. )ERASE with no arguments has no effect; to erase everything in the workspace, use the )CLEAR command to start a fresh, clear workspace.

Example

      )vars 
a0 q 
      pi←3.1415926 
      )fns 
function  function2 
      )vars 
a0 pi q 
      ⎕vr 'function' 
    ∇ function 
[1]   "this is a function" 
[2]    
    ∇ 2013 3 13 11 5 38 975 (UTC) 
      ⎕vr "function2" 
    ∇ function2 
[1]   'This is another function' 
[2]    
    ∇ 2013 3 13 11 6 0 350 (UTC)
      )fns 
function  function2  
      )vars 
a0 pi q   
      )ERASE function2 pi 
      )fns 
function  
      )vars 
a0 q   
      )ERASE q f  
NOT ERASED:  f 
      )vars 
a0



See also: Quad EX or ⎕EX

System Commands (not case sensitive)
)CLEAR )CLOSE )COPY )DROP )EDIT )ERASE )EXIT )FNS )FOP )FOPS
)IN )INASCII )LIB )LOAD )NEWTAB )NMS )OFF )OPEN )OPS )OUT
)RESET )SAVE )SI )SIC )SINL )SYMB )ULIB )VARS )XLOAD )WSID


See Also
System Commands System Variables and Functions Operators


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