Description Usage Arguments Details Value Author(s) Examples

View source: R/breakline.index.R

Break a vector into segments

1 | ```
breakline.index(Z, ww)
``` |

`Z` |
vector |

`ww` |
indices where the breaks should occur. if a matrix is provided the start and end indices are given, else the breaks are provded. |

Codes used for maps to break map segments along boundaries. But this is more general, nd can be used to break any vector according to given indices. See examples.

List of indices that are segments.

Jonathan M. Lees<[email protected]>

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 | ```
### example with a vector of breaks
h = 1:20
k = breakline.index(h, c(8, 14))
######## select with a matrix of start-ends
r1 = rbind(c(3,10), c(14, 18))
k = breakline.index(h, r1)
j1 = seq(from=3, to=17, by=3)
j2 = j1+5
########## overlapping sequences
r1 = cbind(j1, j2)
k = breakline.index(h, r1)
###### example with coordinates
#### some data:
uu=list()
uu$x=c(136.66,136.34,136.07,136.07,135.62,135.03,134.98,
134.98,135.07,135.25,135.75,137.07,137.35,137.44,138.07,
138.07,137.80,137.75,137.25)
uu$y=c(39.878,39.749,39.490,39.296,39.200,39.135,38.909,
38.618,38.327,38.004,37.875,37.875,38.327,38.489,
38.812,39.006,39.232,39.587,39.943)
### plot raw data
plot(uu$x, uu$y, type="l")
#### cutoff:
z1 = 39
h = 1:length(uu$x)
w1 = which( uu$y>z1)
g1 = list(x=uu$x[w1] , y=uu$y[w1] )
lines(g1, col='red')
############ notice the connecting line.
######### how can we avoid this?
w2 = which(diff(w1)!=1)
k = breakline.index(w1, w2)
for(i in 1:length(k)) lines(uu$x[ k[[i]] ], uu$y[ k[[i]] ], col='blue')
###### see, line is broken correctly
``` |

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