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Umair Durrani
email: umairdurr...@outlook.com
> Subject: Re: [R] Detecting Vehicle locations using R
> From: jdnew...@dcn.davis.ca.us
> Date: Thu, 20 Feb 2014 20:06:28 -0800
> To: umairdurr...@outlook.com; r-help@r-project.org
>
> Please read the Posting Guide, which offers several applicable tips, such as:
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> Sent from my phone. Please excuse my brevity.
>
> On February 20, 2014 6:30:37 PM PST, umair durrani <umairdurr...@outlook.com>
> wrote:
> >I have a data frame of vehicle trajectories. Here's a snapshot:
> >>dput(head(df))structure(list(vehicle = c(2L, 2L, 2L, 2L, 2L, 2L),
> >frame = 43:48, globalx = c(6451214.156, 6451216.824, 6451219.616,
> >6451222.548, 6451225.462, 6451228.376), class = c(2L, 2L, 2L, 2L,
> >2L, 2L), velocity = c(37.76, 37.9, 38.05, 38.18, 38.32, 38.44 ),
> >lane = c(2L, 2L, 2L, 2L, 2L, 2L)), .Names = c("vehicle", "frame",
> >"globalx", "class", "velocity", "lane"), row.names = c(NA, 6L), class =
> >"data.frame")
> >where, vehicle= vehicle id, frame= frame id of time frames in which it
> >was observed, globalx = x coordinate of the front center of the
> >vehicle, class=type of vehicle (1=motorcycle, 2=car, 3=truck),
> >velocity=speed of vehicles in feet per second, lane= lane number (there
> >are 6 lanes).The 'frame' represents one tenth of a second i.e. one
> >frame is 0.1 seconds long. At frame 't' the vehicle has globalx
> >coordinate x(t) and at frame 't-1' (0.1 seconds before) it was x(t-1).
> >If the reference location has globalx coordinate=6451179.1116 then I
> >simply want a new column in df called 'u' which has 'yes' in the row
> >where globalx of the vehicle was greater than reference coordinate at
> >'U' AND the previous consecutive globalx coordinate of this vehicle was
> >less than reference coordinate at 'U'(i.e. reference coordinate is
> >between the 2 locations of vehicle in two consecutive frames). This
> >means that if df has 100 vehicles then there will be 100 'yes' in 'u'
> >column because every vehicle wil!
> >
> >
> >l meet the above criteria only once. I have tried to do this by running
> >the function with ifelse and also tried to do the same using a for loop
> >but it doesn't work for me.
> >
> >
> >
> > [[alternative HTML version deleted]]
> >
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>
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