Displaying 4 results from an estimated 4 matches for "polyangl".
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2018 Jan 30
2
Calculating angle of a polyline
Assuming your polyline is defined by two vectors, one for the x
coordinates, one for the y coordinates, you can try the following
library(NISTunits)
polyangles <- function(xV,yV) {
stopifnot( (length(xV)==length(yV)) && (length(xV) >= 3))
v <- function(i) { c( xV[i]-xV[i-1], yV[i]-yV[i-1])}
vlen <- function(v) { sqrt(sum(v*v)) }
lV <- rep(NA_real_,length(xV))
for ( i in 2:(length(xV)-1) )
lV[i] <- acos( sum(v(i)*...
2018 Jan 30
0
Calculating angle of a polyline
I like to use complex numbers for 2-dimensional geometry. E.g.,
> polyAngles2
function (xV, yV)
{
stopifnot((length(xV) == length(yV)) && (length(xV) >= 3))
z <- complex(re = xV, im = yV)
c(NA, diff(Arg(diff(z))), NA) # radians, positive is counter-clockwise
}
> x <- c(0:3)
> y <- c(0,0,1,1)
> polyAngles2(x,y) / pi * 180
[1] NA 4...
2018 Jan 30
2
Calculating angle of a polyline
Dear R users
I am trying to find a formula to calculate the angle of a polyline. Is
there a way to do this?
Many thanks.
--
Best Regards
Javad Bayat
M.Sc. Environment Engineering
Alternative Mail: bayat194 at yahoo.com
[[alternative HTML version deleted]]
2018 Jan 30
0
Calculating angle of a polyline
A polyline by definition has many angles, so your question is ill-formed. And this is a question about math, not R, so is off topic here. I suggest reading Wikipedia.
--
Sent from my phone. Please excuse my brevity.
On January 29, 2018 11:10:02 PM PST, javad bayat <j.bayat194 at gmail.com> wrote:
>Dear R users
>I am trying to find a formula to calculate the angle of a polyline. Is