# outer.convhull

From tripack v1.0-1

##### Version of outer which operates only in a convex hull

This version of `outer`

evaluates `FUN`

only on that part of the grid $cx x cy$ that is enclosed within
the convex hull of the points (`px`

,`py`

).
This can be useful for spatial estimation if no extrapolation is wanted.

##### Usage

`outer.convhull(cx,cy,px,py,FUN,duplicate="remove",...)`

##### Arguments

- cx
- x cordinates of grid
- cy
- y cordinates of grid
- px
- vector of x coordinates of points
- py
- vector of y coordinates of points
- FUN
- function to be evaluated over the grid
- duplicate
- indicates what to do with duplicate
$(px_i,py_i)$ points, default
`"remove"`

.

##### Value

- Matrix with values of
`FUN`

(`NA`

s if outside the convex hull).

##### See Also

##### Examples

```
x<-runif(20)
y<-runif(20)
z<-runif(20)
z.lm<-lm(z~x+y)
f.pred<-function(x,y)
{predict(z.lm,data.frame(x=as.vector(x),y=as.vector(y)))$predictor}
xg<-seq(0,1,0.05)
yg<-seq(0,1,0.05)
image(xg,yg,outer.convhull(xg,yg,x,y,f.pred))
points(x,y)
```

*Documentation reproduced from package tripack, version 1.0-1, License: R functions: GPL, Fortran code: available at netlib*

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