Find - Revision history

Sudleyplace at 22:28, 15 April 2018

2018-04-15T22:28:57Z

← Older revision		Revision as of 18:28, 15 April 2018
Line 1:		Line 1:
	<apll>		<table border="1" cellpadding="5" cellspacing="0" rules="none" summary="">
	Z←L⍷R		<tr>
	</apll>		<td>
	<p>		<table border="0" cellpadding="5" cellspacing="0" summary="">
	<br> <b>~~Find~~</b> ~~looks for patterns~~ <apll>L</apll> in <apll>R</apll>.		<tr>
	<br> ~~It returns a simple boolean array with the same shape as~~ <~~apll~~>R</~~apll~~>.		<td valign="top"><apll>Z←L⍷R</apll></td>
	<br> <br>		<td></td>
	<apll>L</apll> and <apll>R</apll> are arbitrary arrays.		<td></td>
			<td>finds the matches of <apll>L</apll> in <apll>R</apll>.</td>
			</tr>
			</table>
			</td>
			</tr>
			<tr>
			<td><apll>L</apll> and <apll>R</apll> are arbitrary arrays of any rank, shape, or datatype.
	But to be useful,		But to be useful,
	the rank of <apll>L</apll>		<ul>
	should not be more than the rank of <apll>R</apll>,		<li>the rank of <apll>L</apll> should not be more than the rank of <apll>R</apll></li>
	~~and~~ both arguments should have the same type		<li>the shape of <apll>L</apll> padded with enough leading <apll>1</apll>s to equal the rank of <apll>R</apll> should be less than or equal to the shape of <apll>R</apll></li>
	(either both character or both numeric).		<li>both arguments should have the same type (either both character or both numeric)</li>
	<br> <br>		</ul>
	If <apll>L</apll> is a ~~scalar,~~		otherwise the result is all zero.</td>
	~~then~~ <apll>~~Z←L⍷R ←→ R∊L~~</apll>.		</tr>
	~~<br/>~~		<tr>
	If <apll>L</apll> ~~is not a scalar,~~		<td><apll>Z</apll> is a Boolean array of the same rank and shape as <apll>R</apll> where each <apll>1</apll> represents the upper left corner of a place in <apll>R</apll> of a match with <apll>L</apll>.
	~~then it~~ represents a ~~contiguous pattern,~~		</td>
	~~which may or may not be found in one or more places~~ in <apll>R</apll>.		</tr>
	<br> <br>		</table>
	~~If the arguments are numeric,~~
	~~then the result is sensitive to~~ <~~apll~~>~~⎕CT~~</~~apll~~>.

	<br> <br>		If <apll>L</apll> is a scalar, then <apll>L⍷R ←→ R∊L</apll>.
	~~Examples:~~
	<~~br> <br~~>
	<apll>

	<~~br/~~> ~~       R←3 8⍴'thirteenfourteenfifteen '~~		If <apll>L</apll> is not a scalar, then it represents a contiguous pattern,
	<br/> ~~       R~~		which may or may not be found in one or more places in <apll>R</apll>.
	<~~br/~~> ~~thirteen~~
	~~<br/> fourteen~~
	<br/> ~~fifteen~~

	<br> <~~br>~~		If the arguments are numeric, then the result is sensitive to <apll>⎕CT</apll>.
	~~<br/>        't'⍷R~~
	~~<br/> 1 0 0 0 1 0 0 0~~
	~~<br/> 0 0 0 0 1 0 0 0~~
	~~<br~~/> ~~0 0 0 1 0 0 0 0~~

	~~<br> <br>~~		For example:
	~~<br/>        'teen'⍷R~~
	~~<br/> 0 0 0 0 1 0 0 0~~
	~~<br/> 0 0 0 0 1 0 0 0~~
	~~<br/> 0 0 0 1 0 0 0 0~~

	</apll>		<apll><pre>
	<br> <br>		R←3 8⍴'thirteenfourteenfifteen '
			R
			thirteen
			fourteen
			fifteen
			't'⍷R
			1 0 0 0 1 0 0 0
			0 0 0 0 1 0 0 0
			0 0 0 1 0 0 0 0
			'teen'⍷R
			0 0 0 0 1 0 0 0
			0 0 0 0 1 0 0 0
			0 0 0 1 0 0 0 0
			(2 4⍴'teen')⍷R
			0 0 0 0 1 0 0 0
			0 0 0 0 0 0 0 0
			0 0 0 0 0 0 0 0
			</pre></apll>

Drab at 15:51, 4 December 2016

2016-12-04T15:51:16Z

← Older revision		Revision as of 11:51, 4 December 2016
Line 3:		Line 3:
	</apll>		</apll>
	<p>		<p>
	<br> <b>Find</b> looks for patterns <apll>R</apll> in <apll>L</apll>.		<br> <b>Find</b> looks for patterns <apll>L</apll> in <apll>R</apll>.
	<br> It returns a simple boolean array with the same shape as <apll>L</apll>.		<br> It returns a simple boolean array with the same shape as <apll>R</apll>.
	<br> <br>		<br> <br>
	<apll>L</apll> and <apll>R</apll> are arbitrary arrays.		<apll>L</apll> and <apll>R</apll> are arbitrary arrays.
	But to be useful,		But to be useful,
	the rank of <apll>R</apll>		the rank of <apll>L</apll>
	should not be more than the rank of <apll>L</apll>,		should not be more than the rank of <apll>R</apll>,
	and both arguments should have the same type		and both arguments should have the same type
	(either both character or both numeric).		(either both character or both numeric).
	<br> <br>		<br> <br>
	If <apll>R</apll> is a scalar,		If <apll>L</apll> is a scalar,
	then <apll>Z←L⍷R ←→ ~~L∊R~~</apll>.		then <apll>Z←L⍷R ←→ R∊L</apll>.
	<br/>		<br/>
	If <apll>R</apll> is not a scalar,		If <apll>L</apll> is not a scalar,
	then it represents a contiguous pattern,		then it represents a contiguous pattern,
	which may or may not be found in one or more places in <apll>L</apll>.		which may or may not be found in one or more places in <apll>R</apll>.
	<br> <br>		<br> <br>
	If the arguments are numeric,		If the arguments are numeric,
Line 28:		Line 28:
	<apll>		<apll>

	<br/>        ~~L←3~~ 8⍴'thirteenfourteenfifteen '		<br/>        R←3 8⍴'thirteenfourteenfifteen '
	<br/>        L		<br/>        R
	<br/> thirteen		<br/> thirteen
	<br/> fourteen		<br/> fourteen
Line 35:		Line 35:

	<br> <br>		<br> <br>
	<br/>        L⍷'t'		<br/>        't'⍷R
	<br/> 1 0 0 0 1 0 0 0		<br/> 1 0 0 0 1 0 0 0
	<br/> 0 0 0 0 1 0 0 0		<br/> 0 0 0 0 1 0 0 0
Line 41:		Line 41:

	<br> <br>		<br> <br>
	<br/>        L⍷'teen'		<br/>        'teen'⍷R
	<br/> 0 0 0 0 1 0 0 0		<br/> 0 0 0 0 1 0 0 0
	<br/> 0 0 0 0 1 0 0 0		<br/> 0 0 0 0 1 0 0 0

Drab: Created page with " Z←L⍷R

Find looks for patterns R in L.
It returns a simple boolean array with the same shape as L..."

2016-12-03T13:12:00Z

Created page with "<apll> Z←L⍷R </apll> Find looks for patterns <apll>R</apll> in <apll>L</apll>. It returns a simple boolean array with the same shape as <apll>L</apll>..."

New page

<apll>
Z←L⍷R
</apll>

 Find looks for patterns <apll>R</apll> in <apll>L</apll>.
 It returns a simple boolean array with the same shape as <apll>L</apll>.
 
<apll>L</apll> and <apll>R</apll> are arbitrary arrays.
But to be useful,
the rank of <apll>R</apll>
should not be more than the rank of <apll>L</apll>,
and both arguments should have the same type
(either both character or both numeric).
 
If <apll>R</apll> is a scalar,
then <apll>Z←L⍷R ←→ L∊R</apll>.
 
If <apll>R</apll> is not a scalar,
then it represents a contiguous pattern,
which may or may not be found in one or more places in <apll>L</apll>.
 
If the arguments are numeric,
then the result is sensitive to <apll>⎕CT</apll>.

 
Examples:
 
<apll>

        L←3 8⍴'thirteenfourteenfifteen '
        L
 thirteen
 fourteen
 fifteen

 
        L⍷'t'
 1 0 0 0 1 0 0 0
 0 0 0 0 1 0 0 0
 0 0 0 1 0 0 0 0

 
        L⍷'teen'
 0 0 0 0 1 0 0 0
 0 0 0 0 1 0 0 0
 0 0 0 1 0 0 0 0

</apll>

Find - Revision history

Sudleyplace at 22:28, 15 April 2018

Drab at 15:51, 4 December 2016

Drab: Created page with " Z←L⍷R Find looks for patterns R in L. It returns a simple boolean array with the same shape as L..."

Drab: Created page with " Z←L⍷R

Find looks for patterns R in L.
It returns a simple boolean array with the same shape as L..."