Re: [R] interpolation function
What you intend strikes me as being pretty silly. Do not expect R to work magic for you. Even if there were such a function as you desire in R, the results it would give would be effectively meaningless for data such as you exhibited. cheers, Rolf Turner [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] interpolation function
I do not understand your question. If this was not a sparse matrix, then I would have asked you refer into the missing value literature. Even there, people generally remove any columns/rows that have too many missing values to avoid unreliable results. And since this is a sparse matrix, you are going to have too many missing values on all rows and columns. I could be wrong but if I am, someone will tell me that soon enough. Regards, Adai On Fri, 2005-08-05 at 12:12 +, 吴 昊 wrote: Hi, I have a sparse matrix.I want to fill values into the entries whose value is 0.The new generated values should come from the interpolation of the values have existed.Does R provide such interpolation functions which operate on Matrix, for example ,such a matrix below 0 0 0 0 2.3 0 0 0 0 0 0 3.1 0 0 0 0 1.4 0 0 0 0 0 0 0 0 0 0 1.1 0 0 0 0 0 0 0 0 0 0 0 4 0 0 0 0 6 0 0 0 0 0 0 0 0 0 0 0 0 0 0 7 0 0 0 0 3 0 0 0 0 6 0 0 0 0 0 0 9 0 0 0 0 thanks a lot hao wu __ 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] interpolation function
I hope you don't take offense at anything said on this list. My philosophy about this is summarized in something I wrote last December that has since been immoratlized in the fortunes package: library(fortunes) fortune(Spencer Graves) Our great-great grandchilren as yet unborn may read some of the stupid questions and/or answers that I and perhaps others give from time to time. I'd rather get flamed for saying something stupid in public on this list than to continue to provide substandard service to the people with whom I work because I perpetrated the same mistake in an environment in which no one questioned so effectively my errors. -- Spencer Graves (in a discussion on whether answers on R-help should be more polite) R-help (December 2004) Best Wishes, spencer graves Rolf Turner wrote: What you intend strikes me as being pretty silly. Do not expect R to work magic for you. Even if there were such a function as you desire in R, the results it would give would be effectively meaningless for data such as you exhibited. cheers, Rolf Turner [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 -- Spencer Graves, PhD Senior Development Engineer PDF Solutions, Inc. 333 West San Carlos Street Suite 700 San Jose, CA 95110, USA [EMAIL PROTECTED] www.pdf.com http://www.pdf.com Tel: 408-938-4420 Fax: 408-280-7915 __ 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] interpolation function
On Fri, 2005-05-08 at 12:12 +, 吴 昊 wrote:
Hi,
I have a sparse matrix.I want to fill values into the entries whose value
is 0.The new generated values should come from the interpolation of the
values have existed.Does R provide such interpolation functions which
operate on Matrix, for example ,such a matrix below
0 0 0 0 2.3 0 0 0 0
0 0 3.1 0 0 0 0 1.4 0
0 0 0 0 0 0 0 0 0
1.1 0 0 0 0 0 0 0 0
0 0 0 4 0 0 0 0 6
0 0 0 0 0 0 0 0 0
0 0 0 0 0 7 0 0 0
0 3 0 0 0 0 6 0 0
0 0 0 0 9 0 0 0 0
thanks a lot
hao wu
Does this look like an answer? If anyone knows a better way please tell
me.
d-c(0,2,3,2,0,3,4,0,0,0,0,0)
d.mat-matrix(data=d,nrow=4,ncol=3,byrow=TRUE)
for(i in 1:length(d.mat[1,])){
+ d.mat[,i][d.mat[,i]==0]-mean(d.mat[,i][d.mat[,i]0])
+ }
Thanks
Tom
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Re: [R] interpolation function
I don't know if what Hao wanted to do is to hang himself, but if so, perhaps here is one possible rope: idx - which(m 0, arr.ind=TRUE) m.nz - m[idx] library(akima) (m.int - interp.new(idx[,1], idx[,2], m.nz, xo=1:9, yo=1:9, extrap=TRUE)) $x [1] 1 2 3 4 5 6 7 8 9 $y [1] 1 2 3 4 5 6 7 8 9 $z [,1] [,2] [,3] [,4] [,5] [,6] [,7] [1,] 57.1356740 55.18522 38.413800 18.086957 2.30 0.737908 22. 544616 [2,] 18.8241001 19.35348 3.10 -20.355403 -41.610566 -51.308028 -40. 090327 [3,]3.2234619 8.63630 -5.312670 -29.221287 -53.732091 -69.487619 -67. 130408 [4,]1.100 13.75521 4.290890 -17.935507 -43.566514 -63.244671 -67. 612515 [5,]3.2013295 25.25298 22.408739 4.00 -20.615776 -42.081126 -51. 038588 [6,]0.2005624 33.62766 39.538938 27.083292 5.618185 -15.498922 -26. 910566 [7,] -17.2478151 29.37731 46.179546 41.812431 25.633428 7.00 -4. 730390 [8,] -58.4893169 3.0 32.828625 38.685475 29.928013 15.913700 6. 00 [9,] -130.5161684 -53.43667 -9.550716 8.258617 9.00 1.817369 -3. 604296 [,8] [,9] [1,] 76.7287988 170.407375 [2,] 1.400 80.913745 [3,] -37.3029968 28.876027 [4,] -47.3125835 6.953079 [5,] -38.1307000 6.00 [6,] -19.2592860 16.750369 [7,] -0.2080329 29.451691 [8,] 9.3350825 34.229953 [9,] 0.8303142 21.211142 Note how wild the interpolated/extrapolated values can be... Andy From: Adaikalavan Ramasamy I do not understand your question. If this was not a sparse matrix, then I would have asked you refer into the missing value literature. Even there, people generally remove any columns/rows that have too many missing values to avoid unreliable results. And since this is a sparse matrix, you are going to have too many missing values on all rows and columns. I could be wrong but if I am, someone will tell me that soon enough. Regards, Adai On Fri, 2005-08-05 at 12:12 +, 吴 昊 wrote: Hi, I have a sparse matrix.I want to fill values into the entries whose value is 0.The new generated values should come from the interpolation of the values have existed.Does R provide such interpolation functions which operate on Matrix, for example ,such a matrix below 0 0 0 0 2.3 0 0 0 0 0 0 3.1 0 0 0 0 1.4 0 0 0 0 0 0 0 0 0 0 1.1 0 0 0 0 0 0 0 0 0 0 0 4 0 0 0 0 6 0 0 0 0 0 0 0 0 0 0 0 0 0 0 7 0 0 0 0 3 0 0 0 0 6 0 0 0 0 0 0 9 0 0 0 0 thanks a lot hao wu __ 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 __ 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] interpolation function in R
?approx ?splinefun __ 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] interpolation function in R
吴 昊 wrote: Hi does R provide some interpolation fucntions? thank __ 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 PLEASE do read the posting guide! help.search(interpolation) returns interpSpline(splines) Create an Interpolation Spline periodicSpline(splines) Create a Periodic Interpolation Spline NLSstClosestX(stats)Inverse Interpolation approx(stats) Interpolation Functions spline(stats) Interpolating Splines for example. There may be others in packages I don't have installed as well. HTH, --sundar __ 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
