RE: [R] intervals and data frames

From: Huntsinger, Reid <>
Date: Tue 07 Jun 2005 - 02:59:59 EST

What do you intend r1 to contain? TRUE and FALSE (an indicator vector?) or say integers 1,2,3 designating your intervals around your 3 sample points? So you would e.g. set r1[k,1] to 3 if the kth grid point in [-1,1] lies in interval 3? Etc? Some more detail would help narrow down the possibilities.

Reid Huntsinger

-----Original Message-----
[] On Behalf Of Erin Hodgess Sent: Monday, June 06, 2005 11:51 AM
Subject: [R] intervals and data frames

Dear R people:

I have a vector which runs from -1 to 1, by .1, inclusively.

Easy to set up. x <- seq(-1,1,.1)

I then sample 3 numbers from x.
y <- sample(x, 3)

Suppose one of my values is -0.7. I want to set up an interval around that
y1 <- pmax(y-0.1,-1)
y2 <- pmin(y+0.1,1)
For the value -.7, the interval will run from -.8 to -.6. There will be several intervals.

Again, nothing interesting so far.

However, now I want to set up something that I will call r1. Essentially, r1 "runs" between -1 and 1 as well. I want to place a value in r1 between -.8 and -.6 for my interval, and zeros elsewhere.

I'm trying to use a data frame in which the first column represents the values from -1 to 1. The remaining columns are initially set to zero. Also, I'm trying to avoid loops.

Any suggestions would be much appreciated.

Thanks in advance,
Erin Hodgess
Associate Professor
Department of Computer and Mathematical Sciences University of Houston - Downtown
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