[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, Sincerely Erin Hodgess Associate Professor Department of Computer and Mathematical Sciences University of Houston - Downtown mailto: [EMAIL PROTECTED] __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
RE: [R] intervals and data frames
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- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Erin Hodgess Sent: Monday, June 06, 2005 11:51 AM To: r-help@stat.math.ethz.ch 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, Sincerely Erin Hodgess Associate Professor Department of Computer and Mathematical Sciences University of Houston - Downtown mailto: [EMAIL PROTECTED] __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
Re: [R] intervals and data frames
Hi,
I thought this would be close to what you wanted:
x - seq(-1,1,.1)
y - sample(x, 3)
r1 - vector(mode = numeric, length = length(x))
sapply(y, function(k) {
y1 - max(k - 0.1, -1)
y2 - min(k + 0.1, 1)
r1[x = y1 x = y2] - 1
r1
})
but found that it's not replacing 3 elements of r1 consistently. There
seems to be a problem with indexing in that last assignment. Can somebody
please explain why indexing by such a logical vector doesn't work here?
Regards,
Sebastian
Erin Hodgess [EMAIL PROTECTED] wrote:
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,
Sincerely
Erin Hodgess
Associate Professor
Department of Computer and Mathematical Sciences
University of Houston - Downtown
mailto: [EMAIL PROTECTED]
__ R-help@stat.math.ethz.ch
mailing list https://stat.ethz.ch/mailman/listinfo/r-helpPLEASE do read
the posting guide! http://www.R-project.org/posting-guide.html
--
Sebastian P. Luque
__
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