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The ARRAY Tag

The ARRAY tag is designed for rendering matrices, though it can also be pressed into service for a number of other tabular alignment tasks.

The syntax of the ARRAY tag is illustrated in the following example:

Example

Source: 
<ARRAY LDELIM=( RDELIM=)>
<ROW><ITEM>1</ITEM><ITEM>z^2^</ITEM></ROW>
<ROW><ITEM>0</ITEM><ITEM>1</ITEM></ROW>
</ARRAY>

Output:

The </ITEM> and </ROW> tags are optional.

The LDELIM and RDELIM parameters are optional. The same effect can also be achieved by wrapping a matrix in a BOX tag. WebEQ accepts any character as the value of the LDELIM or RDELIM parameters. Of course, most of them do not stretch vertically, and give nonsense results. The stretchy delimiters are [,],(,),{,}, and |.

The ARRAY tag also accepts an optional ALIGN parameter which accepts the values TOP, BOTTOM and MIDDLE. The default is MIDDLE.

Example

Source: 
<ARRAY LDELIM=[ RDELIM=] ALIGN=BOTTOM>
<ROW><ITEM>1<ITEM>2<ITEM>3<ROW><ITEM>4<ITEM>5<ITEM>6</ARRAY>
<ARRAY LDELIM=[ RDELIM=] ALIGN=TOP>
<ROW><ITEM>1<ITEM>2<ROW><ITEM>3<ITEM>4<ROW><ITEM>5<ITEM>6</ARRAY>
=<ARRAY LDELIM=[ RDELIM=]>
<ROW><ITEM>14<ITEM>32<ROW><ITEM>32<ITEM>77</ARRAY>

Output:

The most powerful parameter the ARRAY tag recognizes is the optional COLDEF parameter. The value of COLDEF is a formatting string that determines the alignment of the array columns, and sets optional column separator characters. The alignment characters are L, R and C for flush left, flush right and centered alignment. The valid separators are +,- and =.

Example

Source: 
F(x) = <ARRAY LDELIM={ COLDEF=CLL><ROW><ITEM>x<ITEM><T>if</T><ITEM>x>0
<ROW><ITEM>x^2^<ITEM><T>if</T><ITEM>x>0</ARRAY>

Output:

Example

Source: 
<ARRAY  COLDEF=C+C=C><ROW><ITEM>3x<ITEM>4y<ITEM>16
<ROW><ITEM>-2x<ITEM>7y<ITEM>-2</ARRAY>

Output:

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Comments to: rminer@geom.umn.edu
Created: Fri Sep 8 11:39:00 1995 --- Last modified: Apr 17 1996