fyx: Waiting distance pdf
In david-borchers/LT2D: Line transect estimation in two dimensions

Description Usage Arguments Details Value Examples

Calculates the pdf of the 'waiting distance' f(y,x)=h(y,x)*\exp(-\int_y^{ystart} h(t,x) dt).

1	fyx(y, x, b, hr, ystart, nint = 100)

`y`	scalar or vector; forward distance
`x`	scale or vector; perp. distance
`b`	two-element vector of hazard rate parameters, some of whihc may be logged
`hr`	hazard rate function
`ystart`	max forward distance at which could possibly detect animal (see details).
`nint`	number of intervals in numerical integration.

Need to ensure the hazard function has decayed to (very close to) zero by ystart.

pdf of waiting distance at x,y

w=1; ystart=4
gridx=seq(0,w,length=50); gridy=seq(0,ystart,length=50)
f=outer(gridy,gridx,FUN=fyx,b=c(-0.2876821, -2.3025851),hr=h2,ystart)
persp(gridx,gridy,t(f),theta=45,phi=35,zlab="f(y|x)")