If x is a 1-vector or a 3-vector, operate on xyz only If x is a 4-vector, apply operation to xyz and diameter

# S3 method for neuron
Ops(e1, e2 = NULL)

## Arguments

e1 a neuron (a numeric vector to multiply neuron coords in neuron)

## Value

modified neuron

n1<-Cell07PNs[[1]]*2