Nothing

```
##
## p3d:E.phi.R
## 2011-12-22
##
E.phi <-
function( phi ) {
# incline horizontal plane by phi degrees
# note that userMatrix for spinning has form E.phi %*% S.theta
phi = phi *2*pi/360
cbind(c(1,0,0,0), c(0,cos(phi),sin(phi),0), c(0,-sin(phi), cos(phi),0), c(0,0,0,1))
}
```

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