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## 3.3 Spacing and rotation

The `*`object form described above can be used to space individual objects differently, however, it is also possible to change the overall spacing of a matrix by inserting the following codes between `\xymatrix` and the following `{`:

`@=`dimen | set spacing
`@R=`dimen | set row spacing
`@C=`dimen | set column spacing
`@!` | uniform spacing
`@!R` | uniform row spacing
`@!C` | uniform column spacing

In the first three you can use the operators `+`, `+=`, `-`, and `-=`, instead of `=` with the same meaning as in section 2.2, i.e., replace `set' with `increase', `increase to at most', `decrease', and `decrease to at least', respectively. For example, `$\xymatrix@1@=0pt@!{A&B\\ C&D}$` in the text typesets .

Finally a special notation allows rotation of an entire matrix:

`@`d | rotate towards d

Only the matrix grid will rotate, however, not the actual contents.

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