r - Number of segments in SpatialLinesDataFrame -


after importing spatial lines dataframe readogr, determine number of line segments (nodes) in each line. cannot find practical way export lengths vector.

routes@lines me line slots, how 1 length of each one?

for example, in sample data below, see first line composed of 93 segments, second line composed of 170 segments, third 91 segments, , on.

in end, i'd vector of 1657 numbers representing length of line segments in spatiallinesdataframe

is there quick solution? 

> class(routes) [1] "spatiallinesdataframe" attr(,"package") [1] "sp" > str(routes) formal class 'spatiallinesdataframe' [package "sp"] 4 slots   ..@ data       :'data.frame': 1657 obs. of  3 variables:   .. ..$ start_time: factor w/ 1631 levels "2016/09/09 00:00:02",..: 1 2 3 4 5 6 7 8 9 10 ...   .. ..$ duration  : int [1:1657] 786 1248 738 786 651 660 616 889 408 475 ...   .. ..$ difftime  :class 'difftime'  atomic [1:1657] 2 4 19 67 92 119 170 202 206 213 ...   .. .. .. ..- attr(*, "units")= chr "secs"   ..@ lines      :list of 1657   .. ..$ :formal class 'lines' [package "sp"] 2 slots   .. .. .. ..@ lines:list of 1   .. .. .. .. ..$ :formal class 'line' [package "sp"] 1 slot   .. .. .. .. .. .. ..@ coords: num [1:93, 1:2] -79.9 -79.9 -79.9 -79.9 -79.9 ...   .. .. .. ..@ id   : chr "0"   .. ..$ :formal class 'lines' [package "sp"] 2 slots   .. .. .. ..@ lines:list of 1   .. .. .. .. ..$ :formal class 'line' [package "sp"] 1 slot   .. .. .. .. .. .. ..@ coords: num [1:170, 1:2] -79.9 -79.9 -79.9 -79.9 -79.9 ...   .. .. .. ..@ id   : chr "1"   .. ..$ :formal class 'lines' [package "sp"] 2 slots   .. .. .. ..@ lines:list of 1   .. .. .. .. ..$ :formal class 'line' [package "sp"] 1 slot   .. .. .. .. .. .. ..@ coords: num [1:91, 1:2] -79.9 -79.9 -79.9 -79.9 -79.9 ...   .. .. .. ..@ id   : chr "2"

based on output structure,

sapply( routes@lines, function (x) dim(x@lines[[1]]@coords)[1] )

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