Description Usage Arguments Details Value Author(s) See Also Examples

Compute area of intersection between a disc and a window

1 | ```
discpartarea(X, r, W=as.owin(X))
``` |

`X` |
Point pattern (object of class |

`r` |
Matrix, vector or numeric value specifying the radii of the discs. |

`W` |
Window (object of class |

This algorithm computes the exact area of the intersection between
a window `W`

and a disc (or each of several discs).
The centres of the discs are specified by the point pattern
`X`

, and their radii are specified by `r`

.

If `r`

is a single numeric value, then the algorithm computes the
area of intersection between `W`

and the disc of radius `r`

centred
at each point of `X`

, and returns a one-column matrix
containing one entry for each point of `X`

.

If `r`

is a vector of length `m`

, then the algorithm
returns an `n * m`

matrix in which the entry on row `i`

,
column `j`

is the area of the
intersection between `W`

and the disc centred at `X[i]`

with radius `r[j]`

.

If `r`

is a matrix, it should have one row for each point in
`X`

. The algorithm
returns a matrix in which the entry on row `i`

,
column `j`

is the area of the
intersection between `W`

and the disc centred at `X[i]`

with radius `r[i,j]`

.

Areas are computed by analytic geometry.

Numeric matrix, with one row for each point of `X`

.

and \rolf

1 2 3 | ```
data(letterR)
X <- runifpoint(3, letterR)
discpartarea(X, 0.2)
``` |

spatstat documentation built on April 5, 2018, 5:04 p.m.

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