[R] Data frames intersections

[Julie Poitevin]

Hello, 
> I want to build a map (bus accessibility map) and for that I need to identify some polygons intersections. To do that I have 2 data.frame: batiments (that gives buildings in a city) and arrets_buffer (that gives bus stops (points) with a buffer around the point).
> 
> I want to have a column giving the intersect binary result (TRUE or FALSE) in batiments data.frame. I use st_intersects from sf package.
> 
> For that I wanted to perform this loop, but it's not a good idea:
> 
> for (i in nrow(arrets_buffer)) {
>   batiments$in_recharges <- st_intersects(x = batiments, arrets_buffer[i,], sparse = FALSE)
> }
> 
> each time i is incremented, batiments$in_recharges is removed with new values. So at the end I have results for i=nrow(arrets_buffer) only....
> 
> No possibility to add a loop in the loop as the number of lines is quite important (the loop will turns a long time..)
> 
> Do you have some some idea to help me?
> 
> Many thanks for your help

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