| addline | R Documentation | 
adds a line from x1 to x2 to a raster layer
addline(r, x1, x2, val, plot = FALSE)
| r | raster that represents the landscape | 
| x1 | from coordinates | 
| x2 | to coordinates | 
| val | resistance value 1 is no resistance | 
| plot | switch if landscape should be plotted | 
returns modified raster layer
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