modjitter {adlift}

modjitter

Description

This function jitters grid values by a proportion of the regular distance between consecutive gridpoints and then alters it to lie in [0,1].

Usage

modjitter(x, amount)

Arguments

x

a vector to be jittered (e.g. a gridpoint vector).

amount

a value of how much to jitter the vector (expressed as a proportion of the regular gridpoint distance, d).

Details

The function uses dojitter to jitter the gridpoint vector by (amount*d) . The endpoints are fixed to be zero and one, and the corresponding jx values to x[2] and x[length(x)-1] are randomised again in the intervals [0,x[2]+amount*d] and [x[length(x)-1]-amount*d,1] respectively.

Value

jx

the jittered version of x

Author(s)

Matt Nunes ([e-mail]), Marina Knight

See Also

dojitter, make.signal2

Examples

#create grid vector
#
xgrid<-seq(0,1,length=51)
#
xgrid
#
#a regularly-spaced grid on [0,1]
#
modjitter(xgrid,1)
#
#jitters xgrid with a maximum change of .02, keeping endpoints of zero and one