Xy-pic User's Guide

2.5 More targets

The target address can be given in a large number of formats called positions. The full range of possibilities is described in the reference manual [8, fig. 1,]; here is a number of useful ones in addition to the hop format described in section 1.3:

• ??!C[], where r,c are integers, denotes the relative entry found r rows below and c columns to the right of the current entry (the current entry itself is thus [0,0]). This always corresponds to a [hop], e.g., [1,2] is the same as [drr] and [-2,0] is the same as [uu].
• , where r,c are positive integers, denotes the absolute entry found in the rth row and cth column of the diagram. The top left entry is "1,1".
•  , where t' is any target, changes the base entry of the present arrow to t' and then sets the target to t relative to the original base entry. For example,

  \xymatrix{ A \\
             B & C \ar@<1ex>[ul]
                   \ar@<1ex>[ul];[] }

  typesets
  
  
  

  i.e., the second \ar[ul] arrow starts at the [ul] entry and ends in the current entry.

See section 3.5 for how to use a label as a target.

 

Xy-pic User's Guide