Description Usage Arguments Value Examples
Get the minimum geodesic distance either between all points in a data.frame pairwise, or between all points in a data.frame and one target point.
1 |
df |
A |
point |
An optional target point on the unit sphere
in cartesian coordinates, in which case all distances are
calculated between |
If point
is specified: the shortest
distance from point
to the
points specified by the rows of df
.
If point
is not specified: the shortest
distance pairwise between points in df
.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 | ## Using a CMBDataFrame with HEALPix coordinates only
cmbdf <- CMBDataFrame(nside = 1, spix = c(1,5,12), ordering = "ring")
plot(cmbdf, hp.boundaries = 1, col = "blue", size = 5)
p <- c(0,0,1)
minDist(cmbdf, p) # no need to have coordinates
## Using a HPDataFrame with HEALPix coordinates only
hp <- HPDataFrame(nside = 1, I = rep(0,3), spix = c(1,5,12) )
minDist(hp, p) # notice no need to have coordinates
## Using a data.frame with cartesian coordinates
coords(hp) <- "cartesian"
df <- data.frame(x = hp$x, y = hp$y, z = hp$z)
minDist(df, p)
## Using a data.frame with spherical coordinates
coords(hp) <- "spherical"
df <- data.frame(theta = hp$theta, phi = hp$phi)
minDist(df, p)
## min distance between points in cmdf
minDist(cmbdf)
|
Add the following code to your website.
For more information on customizing the embed code, read Embedding Snippets.