System Variable DM - Revision history

WikiSysop at 18:05, 16 April 2018

2018-04-16T18:05:33Z

← Older revision		Revision as of 14:05, 16 April 2018
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	<h1>~~{quad}DM~~ - Diagnostic Message</h1>		<h1><aplxx>⎕DM</aplxx> - Diagnostic Message</h1>
	{{BoxStart\|⎕DM		{{BoxStart\|⎕DM
	\| ~~'''~~Diagnostic Message set to last error message ~~string~~ APL~~'s Interpreter~~ encountered~~'''~~.}}		\| Diagnostic Message set to last error message the APL interpreter encountered.}}
	{{BoxEnd\|⎕DM <u>cannot be assigned a value by the User.~~</u>~~ ~~'''~~APL interpreter sets its ~~string~~ value~~'''~~ when it encounters an error, e.g. 'DOMAIN ERROR'.}}		{{BoxEnd\|Unlike other system variables, <apll>⎕DM</apll> cannot be assigned a value by the User. The APL interpreter sets its value when it encounters an error, e.g. <apll>DOMAIN ERROR</apll>.}}

	~~⎕DM is set by APL to the last diagnostic error message the Interpreter encountered.<br>~~
	~~It is for informational, for diagnostic purposes only. User cannot set its value.<br>~~
	~~'''⎕DM is useful''' for <u>'''viewing'''</u> the last error message, particularly if Error Trapping is<br>~~
	~~being used, or for system-function and user-function '''debugging purposes'''. Just type in:~~

	: ⎕DM		<apll>⎕DM</apll> is set by APL to the last diagnostic error message the Interpreter encountered. It is for informational and diagnostic purposes only. User cannot set its value.

			<apll>⎕DM</apll> is useful for viewing the last error message, particularly if Error Trapping is being used, or for system-function and user-function debugging purposes. For example:

	: ⍴⎕DM ~~⍝In~~ a CLEAR APL Workspace ⎕DM's value is ~~a null string.~~		<apll><pre>
			⎕DM

			⍴⎕DM ⍝ In a CLEAR APL Workspace ⎕DM's value is an empty character vector
	0		0
			+
			SYNTAX ERROR
			+
			∧
			⍴⎕←⎕DM
			SYNTAX ERROR
			+
			∧
			28</pre></apll>

			<apll>⎕DM</apll> is a system variable. An APL error in the '''right argument''' of <apll>⎕EA</apll> will send a diagnostic message to <apll>⎕DM</apll>, as well as a '''triggering error event''' for <apll>⎕ELX</apll>.

			See Also: [[System_Variable_ELX\|⎕ELX]] and [[System_Function_EA\|⎕EA]]


	~~Quad DM(⎕DM) is a system variable. An APL error in the '''right argument''' of '''⎕EA will''' send a<br>~~
	~~diagnostic message to ⎕DM, as will a '''triggering error event''' re ⎕ELX.<br><br>~~
	~~See Also: [[System_Variable_ELX\|Quad ELX or ⎕ELX]] and [[System_Function_EA\|Quad EA or ⎕EA]]<br>~~
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Paul Robinson at 04:46, 22 September 2015

2015-09-22T04:46:24Z

← Older revision		Revision as of 00:46, 22 September 2015
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	'''⎕DM is useful''' for <u>'''viewing'''</u> the last error message, particularly if Error Trapping is<br>		'''⎕DM is useful''' for <u>'''viewing'''</u> the last error message, particularly if Error Trapping is<br>
	being used, or for system-function and user-function '''debugging purposes'''. Just type in:		being used, or for system-function and user-function '''debugging purposes'''. Just type in:
	~~<pre>~~
	~~⎕DM~~

			: ⎕DM

	⍴⎕DM ⍝In a CLEAR APL Workspace ⎕DM's value is a null string.
			: ⍴⎕DM ⍝In a CLEAR APL Workspace ⎕DM's value is a null string.
	0		0
	~~</pre>~~
	Quad DM(⎕DM) is a system variable. An APL error in the '''right argument''' of '''⎕EA will''' send a<br>		Quad DM(⎕DM) is a system variable. An APL error in the '''right argument''' of '''⎕EA will''' send a<br>
	diagnostic message to ⎕DM, as will a '''triggering error event''' re ⎕ELX.<br><br>		diagnostic message to ⎕DM, as will a '''triggering error event''' re ⎕ELX.<br><br>

Robert Wallick: See see also for ⎕ELX and ⎕EA

2015-02-11T22:57:39Z

See see also for ⎕ELX and ⎕EA

← Older revision		Revision as of 18:57, 11 February 2015
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	0		0
	</pre>		</pre>
	Quad DM(⎕DM) is a system variable.<br>		Quad DM(⎕DM) is a system variable. An APL error in the '''right argument''' of '''⎕EA will''' send a<br>
			diagnostic message to ⎕DM, as will a '''triggering error event''' re ⎕ELX.<br><br>
			See Also: [[System_Variable_ELX\|Quad ELX or ⎕ELX]] and [[System_Function_EA\|Quad EA or ⎕EA]]<br>
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Robert Wallick: Inserted definition for Quad DM ⎕DM

2015-02-11T22:31:28Z

Inserted definition for Quad DM ⎕DM

← Older revision		Revision as of 18:31, 11 February 2015
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	<h1>{quad}DM - ~~DEFINITION NEEDED~~</h1>		<h1>{quad}DM - Diagnostic Message</h1>
	{{BoxStart\|⎕DM		{{BoxStart\|⎕DM
	\| ~~DEFINITION NEEDED~~}}		\| '''Diagnostic Message set to last error message string APL's Interpreter encountered'''.}}
	{{BoxEnd\|~~⎕DM←'~~<i>~~VALUE~~</i>'}}		{{BoxEnd\|⎕DM <u>cannot be assigned a value by the User.</u> '''APL interpreter sets its string value''' when it encounters an error, e.g. 'DOMAIN ERROR'.}}

	~~Description here~~ - ~~to do~~		⎕DM is set by APL to the last diagnostic error message the Interpreter encountered.<br>
			It is for informational, for diagnostic purposes only. User cannot set its value.<br>
			'''⎕DM is useful''' for <u>'''viewing'''</u> the last error message, particularly if Error Trapping is<br>
			being used, or for system-function and user-function '''debugging purposes'''. Just type in:
			<pre>
			⎕DM


			⍴⎕DM ⍝In a CLEAR APL Workspace ⎕DM's value is a null string.
			0
			</pre>
			Quad DM(⎕DM) is a system variable.<br>
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Paul Robinson: new stub

2014-11-26T10:15:39Z

new stub

New page

<h1>{quad}DM - DEFINITION NEEDED</h1>
{{BoxStart|⎕DM
| DEFINITION NEEDED}}
{{BoxEnd|⎕DM←'<i>VALUE</i>'}}

Description here - to do

{{System Variables}}
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