Thankyou very much arun,I worked perfectly.:D
Eliza

> Date: Sat, 22 Mar 2014 13:18:21 -0700
> From: smartpink111@yahoo.com
> Subject: Re: Latest question
> To: r-help@r-project.org
> CC: eliza_botto@hotmail.com
> 
> HI Eliza,
> No problem.
> 
> This should be faster:
> res2 <- matrix(as.vector( mat1[row.names(mat1) %in% df1$Ry,colnames(mat1) %in% df1$Rx]),nrow=120, dimnames=list(NULL,colnames(res)))
> 
> identical(res,res2)
> #[1] TRUE
> A.K.
> 
> 
> 
> 
> 
> On Saturday, March 22, 2014 4:14 PM, eliza botto <eliza_botto@hotmail.com> wrote:
> 
> Thankyou very very much arun. Right now i cant have an acess to PC, as i am on the move. I will run the code when i get back to home in an hour and if there would be issue i'll definitely tell you.
> 
> thanks once again
> 
> Eliza 
> 
> 
> > Date: Sat, 22 Mar 2014 13:08:10 -0700
> > From: smartpink111@yahoo.com
> > Subject: Re: Latest question
> > To: r-help@r-project.org
> > CC: eliza_botto@hotmail.com
> > 
> > Hi Eliza,
> > May be this helps:
> > 
> >  set.seed(42)
> >  mat1 <- matrix(sample(1:50,43200*720,replace=TRUE),ncol=720,dimnames=list(rep(y,each=120), x))
> >  df1 <- expand.grid(Ry=Ry,Rx=Rx)
> >   lst1 <- lapply(seq_len(nrow(df1)),function(i) {x1<- df1[i,]; mat1[row.names(mat1) %in% x1[1], colnames(mat1) %in% x1[2],drop=FALSE]})
> >  res <- do.call(cbind,lst1)
> >  dim(res)
> > #[1] 120 408
> > colnames(res) <- sapply(lst1,function(x) paste(colnames(x),unique(rownames(x)),sep="*"))
> >  row.names(res) <- NULL
> >  res[1:3,1:3]
> >  #    61.75*25.25 61.75*25.75 61.75*26.25
> > #[1,]          28           8           7
> > #[2,]           6          17          44
> > #[3,]          48          21          37
> > 
> > 
> > A.K.
> > 
> > 
> > Dear Arun, 
> >  
> > I have a data frame of  43200 obs. of  720 variables (43200 rows and 120 columns), say df. Besides df, i also have two column vectors x (1 row and 720 columns) and y   
> > (360 rows and 1 column) which should be located in such a way that "x" covers the top of 720 rows of df, so in a way x is the column names of df. while "y" should be   
> > located in every 120th alternating rows of df so that it covers the entire rows of df (120*360=43200) which means y[1,]=-89.75 is the name of row 1 of df while y[2,]  
> > =-89.25 is the name of rows number 121st of df (you can assume that intermediate rows have the same names. So in way we can say that y[1,]=-89.75 is name of row1 to   
> > row120 of df and y[2,]=-89.25 is name of row 121 to 241 of df), similarly y[3,]=88.75 is the name of 241st row of df and so on untill 43200 rows of df are covered. 
> >  
> > we have two more vector, which will called refrence vectors R1 (1 row * 24 columns) and R2 (1 row * 17 columns), which are some of the selected values from "x" and   
> > "y". 
> > let 
> >  
> > Rx<- c(61.75, 62.25 ,62.75, 63.25, 63.75, 64.25, 64.75, 65.25, 65.75, 66.25, 66.75, 67.25, 67.75, 68.25, 68.75, 69.25, 69.75, 70.25, 70.75, 71.25, 71.75, 72.25, 72.75,   
> > 73.25) 
> >  
> > Ry<-c(25.25, 25.75 ,26.25, 26.75, 27.25, 27.75, 28.25, 28.75, 29.25, 29.75, 30.25, 30.75, 31.25, 31.75, 32.25, 32.75, 33.25) 
> >     
> > of the "df" i only want to select those columns which have column names similar to what is written in Rx and row names similar to Ry. so in the end we should have 408   
> > column and 120 rows each containg a combination of Rx and Ry in the following manner, 
> >  
> > 61.75*25.25    61.75*25.75    61.75*26.25    61.75*26.75..........62.25*25.25    62.25*25.75    62.25*26.25    62.25*26.75  
> >  
> > 120 values    120 values    120 values    120 values        120 values    120 values    120 values    120 values 
> >  
> >  
> > > dput(x) 
> >  
> > c(-179.75, -179.25, -178.75, -178.25, -177.75, -177.25, -176.75,  
> > -176.25, -175.75, -175.25, -174.75, -174.25, -173.75, -173.25,  
> > -172.75, -172.25, -171.75, -171.25, -170.75, -170.25, -169.75,  
> > -169.25, -168.75, -168.25, -167.75, -167.25, -166.75, -166.25,  
> > -165.75, -165.25, -164.75, -164.25, -163.75, -163.25, -162.75,  
> > -162.25, -161.75, -161.25, -160.75, -160.25, -159.75, -159.25,  
> > -158.75, -158.25, -157.75, -157.25, -156.75, -156.25, -155.75,  
> > -155.25, -154.75, -154.25, -153.75, -153.25, -152.75, -152.25,  
> > -151.75, -151.25, -150.75, -150.25, -149.75, -149.25, -148.75,  
> > -148.25, -147.75, -147.25, -146.75, -146.25, -145.75, -145.25,  
> > -144.75, -144.25, -143.75, -143.25, -142.75, -142.25, -141.75,  
> > -141.25, -140.75, -140.25, -139.75, -139.25, -138.75, -138.25,  
> > -137.75, -137.25, -136.75, -136.25, -135.75, -135.25, -134.75,  
> > -134.25, -133.75, -133.25, -132.75, -132.25, -131.75, -131.25,  
> > -130.75, -130.25, -129.75, -129.25, -128.75, -128.25, -127.75,  
> > -127.25, -126.75, -126.25, -125.75, -125.25, -124.75, -124.25,  
> > -123.75, -123.25, -122.75, -122.25, -121.75, -121.25, -120.75,  
> > -120.25, -119.75, -119.25, -118.75, -118.25, -117.75, -117.25,  
> > -116.75, -116.25, -115.75, -115.25, -114.75, -114.25, -113.75,  
> > -113.25, -112.75, -112.25, -111.75, -111.25, -110.75, -110.25,  
> > -109.75, -109.25, -108.75, -108.25, -107.75, -107.25, -106.75,  
> > -106.25, -105.75, -105.25, -104.75, -104.25, -103.75, -103.25,  
> > -102.75, -102.25, -101.75, -101.25, -100.75, -100.25, -99.75,  
> > -99.25, -98.75, -98.25, -97.75, -97.25, -96.75, -96.25, -95.75,  
> > -95.25, -94.75, -94.25, -93.75, -93.25, -92.75, -92.25, -91.75,  
> > -91.25, -90.75, -90.25, -89.75, -89.25, -88.75, -88.25, -87.75,  
> > -87.25, -86.75, -86.25, -85.75, -85.25, -84.75, -84.25, -83.75,  
> > -83.25, -82.75, -82.25, -81.75, -81.25, -80.75, -80.25, -79.75,  
> > -79.25, -78.75, -78.25, -77.75, -77.25, -76.75, -76.25, -75.75,  
> > -75.25, -74.75, -74.25, -73.75, -73.25, -72.75, -72.25, -71.75,  
> > -71.25, -70.75, -70.25, -69.75, -69.25, -68.75, -68.25, -67.75,  
> > -67.25, -66.75, -66.25, -65.75, -65.25, -64.75, -64.25, -63.75,  
> > -63.25, -62.75, -62.25, -61.75, -61.25, -60.75, -60.25, -59.75,  
> > -59.25, -58.75, -58.25, -57.75, -57.25, -56.75, -56.25, -55.75,  
> > -55.25, -54.75, -54.25, -53.75, -53.25, -52.75, -52.25, -51.75,  
> > -51.25, -50.75, -50.25, -49.75, -49.25, -48.75, -48.25, -47.75,  
> > -47.25, -46.75, -46.25, -45.75, -45.25, -44.75, -44.25, -43.75,  
> > -43.25, -42.75, -42.25, -41.75, -41.25, -40.75, -40.25, -39.75,  
> > -39.25, -38.75, -38.25, -37.75, -37.25, -36.75, -36.25, -35.75,  
> > -35.25, -34.75, -34.25, -33.75, -33.25, -32.75, -32.25, -31.75,  
> > -31.25, -30.75, -30.25, -29.75, -29.25, -28.75, -28.25, -27.75,  
> > -27.25, -26.75, -26.25, -25.75, -25.25, -24.75, -24.25, -23.75,  
> > -23.25, -22.75, -22.25, -21.75, -21.25, -20.75, -20.25, -19.75,  
> > -19.25, -18.75, -18.25, -17.75, -17.25, -16.75, -16.25, -15.75,  
> > -15.25, -14.75, -14.25, -13.75, -13.25, -12.75, -12.25, -11.75,  
> > -11.25, -10.75, -10.25, -9.75, -9.25, -8.75, -8.25, -7.75, -7.25,  
> > -6.75, -6.25, -5.75, -5.25, -4.75, -4.25, -3.75, -3.25, -2.75,  
> > -2.25, -1.75, -1.25, -0.75, -0.25, 0.25, 0.75, 1.25, 1.75, 2.25,  
> > 2.75, 3.25, 3.75, 4.25, 4.75, 5.25, 5.75, 6.25, 6.75, 7.25, 7.75,  
> > 8.25, 8.75, 9.25, 9.75, 10.25, 10.75, 11.25, 11.75, 12.25, 12.75,  
> > 13.25, 13.75, 14.25, 14.75, 15.25, 15.75, 16.25, 16.75, 17.25,  
> > 17.75, 18.25, 18.75, 19.25, 19.75, 20.25, 20.75, 21.25, 21.75,  
> > 22.25, 22.75, 23.25, 23.75, 24.25, 24.75, 25.25, 25.75, 26.25,  
> > 26.75, 27.25, 27.75, 28.25, 28.75, 29.25, 29.75, 30.25, 30.75,  
> > 31.25, 31.75, 32.25, 32.75, 33.25, 33.75, 34.25, 34.75, 35.25,  
> > 35.75, 36.25, 36.75, 37.25, 37.75, 38.25, 38.75, 39.25, 39.75,  
> > 40.25, 40.75, 41.25, 41.75, 42.25, 42.75, 43.25, 43.75, 44.25,  
> > 44.75, 45.25, 45.75, 46.25, 46.75, 47.25, 47.75, 48.25, 48.75,  
> > 49.25, 49.75, 50.25, 50.75, 51.25, 51.75, 52.25, 52.75, 53.25,  
> > 53.75, 54.25, 54.75, 55.25, 55.75, 56.25, 56.75, 57.25, 57.75,  
> > 58.25, 58.75, 59.25, 59.75, 60.25, 60.75, 61.25, 61.75, 62.25,  
> > 62.75, 63.25, 63.75, 64.25, 64.75, 65.25, 65.75, 66.25, 66.75,  
> > 67.25, 67.75, 68.25, 68.75, 69.25, 69.75, 70.25, 70.75, 71.25,  
> > 71.75, 72.25, 72.75, 73.25, 73.75, 74.25, 74.75, 75.25, 75.75,  
> > 76.25, 76.75, 77.25, 77.75, 78.25, 78.75, 79.25, 79.75, 80.25,  
> > 80.75, 81.25, 81.75, 82.25, 82.75, 83.25, 83.75, 84.25, 84.75,  
> > 85.25, 85.75, 86.25, 86.75, 87.25, 87.75, 88.25, 88.75, 89.25,  
> > 89.75, 90.25, 90.75, 91.25, 91.75, 92.25, 92.75, 93.25, 93.75,  
> > 94.25, 94.75, 95.25, 95.75, 96.25, 96.75, 97.25, 97.75, 98.25,  
> > 98.75, 99.25, 99.75, 100.25, 100.75, 101.25, 101.75, 102.25,  
> > 102.75, 103.25, 103.75, 104.25, 104.75, 105.25, 105.75, 106.25,  
> > 106.75, 107.25, 107.75, 108.25, 108.75, 109.25, 109.75, 110.25,  
> > 110.75, 111.25, 111.75, 112.25, 112.75, 113.25, 113.75, 114.25,  
> > 114.75, 115.25, 115.75, 116.25, 116.75, 117.25, 117.75, 118.25,  
> > 118.75, 119.25, 119.75, 120.25, 120.75, 121.25, 121.75, 122.25,  
> > 122.75, 123.25, 123.75, 124.25, 124.75, 125.25, 125.75, 126.25,  
> > 126.75, 127.25, 127.75, 128.25, 128.75, 129.25, 129.75, 130.25,  
> > 130.75, 131.25, 131.75, 132.25, 132.75, 133.25, 133.75, 134.25,  
> > 134.75, 135.25, 135.75, 136.25, 136.75, 137.25, 137.75, 138.25,  
> > 138.75, 139.25, 139.75, 140.25, 140.75, 141.25, 141.75, 142.25,  
> > 142.75, 143.25, 143.75, 144.25, 144.75, 145.25, 145.75, 146.25,  
> > 146.75, 147.25, 147.75, 148.25, 148.75, 149.25, 149.75, 150.25,  
> > 150.75, 151.25, 151.75, 152.25, 152.75, 153.25, 153.75, 154.25,  
> > 154.75, 155.25, 155.75, 156.25, 156.75, 157.25, 157.75, 158.25,  
> > 158.75, 159.25, 159.75, 160.25, 160.75, 161.25, 161.75, 162.25,  
> > 162.75, 163.25, 163.75, 164.25, 164.75, 165.25, 165.75, 166.25,  
> > 166.75, 167.25, 167.75, 168.25, 168.75, 169.25, 169.75, 170.25,  
> > 170.75, 171.25, 171.75, 172.25, 172.75, 173.25, 173.75, 174.25,  
> > 174.75, 175.25, 175.75, 176.25, 176.75, 177.25, 177.75, 178.25,  
> > 178.75, 179.25, 179.75) 
> >  
> >  
> > > dput(y) 
> > c(-89.75, -89.25, -88.75, -88.25, -87.75, -87.25, -86.75, -86.25,  
> > -85.75, -85.25, -84.75, -84.25, -83.75, -83.25, -82.75, -82.25,  
> > -81.75, -81.25, -80.75, -80.25, -79.75, -79.25, -78.75, -78.25,  
> > -77.75, -77.25, -76.75, -76.25, -75.75, -75.25, -74.75, -74.25,  
> > -73.75, -73.25, -72.75, -72.25, -71.75, -71.25, -70.75, -70.25,  
> > -69.75, -69.25, -68.75, -68.25, -67.75, -67.25, -66.75, -66.25,  
> > -65.75, -65.25, -64.75, -64.25, -63.75, -63.25, -62.75, -62.25,  
> > -61.75, -61.25, -60.75, -60.25, -59.75, -59.25, -58.75, -58.25,  
> > -57.75, -57.25, -56.75, -56.25, -55.75, -55.25, -54.75, -54.25,  
> > -53.75, -53.25, -52.75, -52.25, -51.75, -51.25, -50.75, -50.25,  
> > -49.75, -49.25, -48.75, -48.25, -47.75, -47.25, -46.75, -46.25,  
> > -45.75, -45.25, -44.75, -44.25, -43.75, -43.25, -42.75, -42.25,  
> > -41.75, -41.25, -40.75, -40.25, -39.75, -39.25, -38.75, -38.25,  
> > -37.75, -37.25, -36.75, -36.25, -35.75, -35.25, -34.75, -34.25,  
> > -33.75, -33.25, -32.75, -32.25, -31.75, -31.25, -30.75, -30.25,  
> > -29.75, -29.25, -28.75, -28.25, -27.75, -27.25, -26.75, -26.25,  
> > -25.75, -25.25, -24.75, -24.25, -23.75, -23.25, -22.75, -22.25,  
> > -21.75, -21.25, -20.75, -20.25, -19.75, -19.25, -18.75, -18.25,  
> > -17.75, -17.25, -16.75, -16.25, -15.75, -15.25, -14.75, -14.25,  
> > -13.75, -13.25, -12.75, -12.25, -11.75, -11.25, -10.75, -10.25,  
> > -9.75, -9.25, -8.75, -8.25, -7.75, -7.25, -6.75, -6.25, -5.75,  
> > -5.25, -4.75, -4.25, -3.75, -3.25, -2.75, -2.25, -1.75, -1.25,  
> > -0.75, -0.25, 0.25, 0.75, 1.25, 1.75, 2.25, 2.75, 3.25, 3.75,  
> > 4.25, 4.75, 5.25, 5.75, 6.25, 6.75, 7.25, 7.75, 8.25, 8.75, 9.25,  
> > 9.75, 10.25, 10.75, 11.25, 11.75, 12.25, 12.75, 13.25, 13.75,  
> > 14.25, 14.75, 15.25, 15.75, 16.25, 16.75, 17.25, 17.75, 18.25,  
> > 18.75, 19.25, 19.75, 20.25, 20.75, 21.25, 21.75, 22.25, 22.75,  
> > 23.25, 23.75, 24.25, 24.75, 25.25, 25.75, 26.25, 26.75, 27.25,  
> > 27.75, 28.25, 28.75, 29.25, 29.75, 30.25, 30.75, 31.25, 31.75,  
> > 32.25, 32.75, 33.25, 33.75, 34.25, 34.75, 35.25, 35.75, 36.25,  
> > 36.75, 37.25, 37.75, 38.25, 38.75, 39.25, 39.75, 40.25, 40.75,  
> > 41.25, 41.75, 42.25, 42.75, 43.25, 43.75, 44.25, 44.75, 45.25,  
> > 45.75, 46.25, 46.75, 47.25, 47.75, 48.25, 48.75, 49.25, 49.75,  
> > 50.25, 50.75, 51.25, 51.75, 52.25, 52.75, 53.25, 53.75, 54.25,  
> > 54.75, 55.25, 55.75, 56.25, 56.75, 57.25, 57.75, 58.25, 58.75,  
> > 59.25, 59.75, 60.25, 60.75, 61.25, 61.75, 62.25, 62.75, 63.25,  
> > 63.75, 64.25, 64.75, 65.25, 65.75, 66.25, 66.75, 67.25, 67.75,  
> > 68.25, 68.75, 69.25, 69.75, 70.25, 70.75, 71.25, 71.75, 72.25,  
> > 72.75, 73.25, 73.75, 74.25, 74.75, 75.25, 75.75, 76.25, 76.75,  
> > 77.25, 77.75, 78.25, 78.75, 79.25, 79.75, 80.25, 80.75, 81.25,  
> > 81.75, 82.25, 82.75, 83.25, 83.75, 84.25, 84.75, 85.25, 85.75,  
> > 86.25, 86.75, 87.25, 87.75, 88.25, 88.75, 89.25, 89.75) 
> >  
> > > dput(Rx) 
> >  
> > c(61.75, 62.25, 62.75, 63.25, 63.75, 64.25, 64.75, 65.25, 65.75,  
> > 66.25, 66.75, 67.25, 67.75, 68.25, 68.75, 69.25, 69.75, 70.25,  
> > 70.75, 71.25, 71.75, 72.25, 72.75, 73.25) 
> >  
> > > dput(Ry) 
> >  
> > c(25.25, 25.75, 26.25, 26.75, 27.25, 27.75, 28.25, 28.75, 29.25,  
> > 29.75, 30.25, 30.75, 31.25, 31.75, 32.25, 32.75, 33.25)
> > 
> > 
> > 
> > 
> > On Saturday, March 22, 2014 12:45 PM, eliza botto <eliza_botto@hotmail.com> wrote:
> > 
> > 
> > Dear Arun,
> > 
> > I have attached my latest question with this email. I hope you me out on it.
> > Thanks in advance
> > 
> > Eliza
 		 	   		  
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