Subset points in dotprops object that match given conditions

# S3 method for dotprops
subset(x, subset, invert = FALSE, ...)

Arguments

x

A dotprops object

subset

A subset of points defined by indices, an expression or a function (see Details)

invert

Whether to invert the subset criteria - a convenience when selecting by function or indices.

...

Value

subsetted dotprops object

Details

subset defines either logical or numeric indices, in which case these are simply applied to the matrices that define the points, vect fields of the dotprops object etc OR a function (which is called with the 3D points array and returns T/F. OR an expression vector).

prune.dotprops, subset.neuron

Examples

## subset using indices ...
dp=kcs20[[10]]
dp1=subset(dp, 1:50)

# ... or an expression
dp2=subset(dp, alpha>0.7)
front=subset(dp, points[,'Z']<40)
# use a helper function
between=function(x, lower, upper) x>=lower & x<=upper
middle=middle=subset(dp, between(points[,'Z'], 40, 60))

# plot results in 3D
# \donttest{
plot3d(front, col='red')
plot3d(middle, col='green')
plot3d(dp, col='blue')
# }

if (FALSE) {

## subset using an selection function
s3d=select3d()
dp1=subset(dp, s3d(points))
# special case of previous version
dp2=subset(dp, s3d)
# keep the points that were removed from dp2
dp2.not=subset(dp, s3d, invert=TRUE)
# (another way of doing the same thing)
dp2.not=subset(dp, Negate(s3d))
stopifnot(all.equal(dp1, dp2))
dp2=subset(dp, alpha>0.5 & s3d(pointd))
dp3=subset(dp, 1:10)

## subset each dotprops object in a whole neuronlist
plot3d(kcs20)
s3d=select3d()
kcs20.partial = nlapply(kcs20, subset, s3d)
clear3d()
plot3d(kcs20.partial, col='red')
plot3d(kcs20, col='grey')
}