Re: [R] Large matrix into a vector
Hi All, Thank you very much for all your suggestions. It's a great learning for me. All the three suggested solutions seem working. I don't know what 'side effects' that you were talking about. To summarize the responses: s - read.table(sample.txt, sep=\t) s1 - as.matrix(s) s1 V1 V2 V3 1 0.59 0.47 0.44 2 0.85 0.42 0.57 3 0.48 0.57 0.57 4 0.61 0.24 0.24 5 0.38 0.21 0.36 6 0.65 0.42 1.50 7 0.49 0.23 0.42 8 0.60 0.51 0.53 9 0.00 0.00 0.00 s2 - as.vector(s1) s2 [1] 0.59 0.85 0.48 0.61 0.38 0.65 0.49 0.60 0.00 0.47 0.42 0.57 0.24 0.21 0.42 0.23 0.51 0.00 0.44 0.57 0.57 0.24 0.36 [24] 1.50 0.42 0.53 0.00 s3 - c(s1) s3 [1] 0.59 0.85 0.48 0.61 0.38 0.65 0.49 0.60 0.00 0.47 0.42 0.57 0.24 0.21 0.42 0.23 0.51 0.00 0.44 0.57 0.57 0.24 0.36 [24] 1.50 0.42 0.53 0.00 s3 - s1 dim(s3) - NULL s3 [1] 0.59 0.85 0.48 0.61 0.38 0.65 0.49 0.60 0.00 0.47 0.42 0.57 0.24 0.21 0.42 0.23 0.51 0.00 0.44 0.57 0.57 0.24 0.36 [24] 1.50 0.42 0.53 0.00 Interestingly, if I apply the same three solutions to the data.frame 's', the results are different: (1) as.vector() keeps the data frame as it is. (2) c() changes into lists, and (3) making dim() - NULL keeps as structure. Thanks again. Kind regards, Ezhil --- Peter Dalgaard [EMAIL PROTECTED] wrote: Marc Schwartz [EMAIL PROTECTED] writes: On Wed, 2007-03-28 at 19:55 -0200, Alberto Monteiro wrote: Prof Brian Ripley wrote: We have already seen three solutions. I don't like to see the use of c() for its side effects. In this case Marc's as.vector seems to me to be self-explanatory, and that is a virtue in programming that is too often undervalued. I agree; but for our enlightnment, what are the side effects of c()? Alberto Monteiro I believe that Prof. Ripley is referring to the following, from the Details section in ?c: c is sometimes used for its side effect of removing attributes except names, for example to turn an array into a vector. as.vector is a more intuitive way to do this, but also drops names. There are also examples in ?c of this behavior. The terminology is a bit unfortunate, though. Side effect usually means an effect that is not reflected in the return value of a function, like printing, plotting, or assignment. -- O__ Peter Dalgaard Øster Farimagsgade 5, Entr.B c/ /'_ --- Dept. of Biostatistics PO Box 2099, 1014 Cph. K (*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918 ~~ - ([EMAIL PROTECTED]) FAX: (+45) 35327907 __ 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 and provide commented, minimal, self-contained, reproducible code. Food fight? Enjoy some healthy debate __ 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 and provide commented, minimal, self-contained, reproducible code.
Re: [R] Large matrix into a vector
On Thu, 2007-03-29 at 02:12 -0700, A Ezhil wrote: Hi All, Thank you very much for all your suggestions. It's a great learning for me. All the three suggested solutions seem working. I don't know what 'side effects' that you were talking about. As Peter noted, the phrase 'side effect' may be sub-optimal. However, I would use the interpretation that in this case, the removal of dim attributes on a single object as a consequence of the use of c(), though documented, is not the primary intended purpose of the function. Stated differently, perhaps in a manner consistent with Prof. Ripley's reply, the coercion of a matrix to a vector by the use of c(), is applying a function to an object to gain the benefit of behavior that is secondary to the intended functionality of combining objects. To summarize the responses: s - read.table(sample.txt, sep=\t) s1 - as.matrix(s) s1 V1 V2 V3 1 0.59 0.47 0.44 2 0.85 0.42 0.57 3 0.48 0.57 0.57 4 0.61 0.24 0.24 5 0.38 0.21 0.36 6 0.65 0.42 1.50 7 0.49 0.23 0.42 8 0.60 0.51 0.53 9 0.00 0.00 0.00 s2 - as.vector(s1) s2 [1] 0.59 0.85 0.48 0.61 0.38 0.65 0.49 0.60 0.00 0.47 0.42 0.57 0.24 0.21 0.42 0.23 0.51 0.00 0.44 0.57 0.57 0.24 0.36 [24] 1.50 0.42 0.53 0.00 s3 - c(s1) s3 [1] 0.59 0.85 0.48 0.61 0.38 0.65 0.49 0.60 0.00 0.47 0.42 0.57 0.24 0.21 0.42 0.23 0.51 0.00 0.44 0.57 0.57 0.24 0.36 [24] 1.50 0.42 0.53 0.00 s3 - s1 dim(s3) - NULL s3 [1] 0.59 0.85 0.48 0.61 0.38 0.65 0.49 0.60 0.00 0.47 0.42 0.57 0.24 0.21 0.42 0.23 0.51 0.00 0.44 0.57 0.57 0.24 0.36 [24] 1.50 0.42 0.53 0.00 Interestingly, if I apply the same three solutions to the data.frame 's', the results are different: (1) as.vector() keeps the data frame as it is. (2) c() changes into lists, and (3) making dim() - NULL keeps as structure. That's because the underlying structure of a data frame is a list, whereas a matrix is a vector. HTH, Marc snip __ 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 and provide commented, minimal, self-contained, reproducible code.
Re: [R] Large matrix into a vector
c(HR) will do it. Ravi. --- Ravi Varadhan, Ph.D. Assistant Professor, The Center on Aging and Health Division of Geriatric Medicine and Gerontology Johns Hopkins University Ph: (410) 502-2619 Fax: (410) 614-9625 Email: [EMAIL PROTECTED] Webpage: http://www.jhsph.edu/agingandhealth/People/Faculty/Varadhan.html -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of A Ezhil Sent: Wednesday, March 28, 2007 1:28 PM To: r-help@stat.math.ethz.ch Subject: [R] Large matrix into a vector Hi, I have a matrix HR(9x27). I would like to make a single vector with elements: t(HR[,1]) followed by t(HR[,2]) and then t(HR[,3] ... etc. Is there any neat way of converting this matrix into a vector rather doing something like c(t(HR[,1]), t(HR[,2]), t(HR[,3]) ..)? Thanks in Advance. Kind regards, Ezhil TV dinner still cooling? Check out Tonight's Picks on Yahoo! TV. __ 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 and provide commented, minimal, self-contained, reproducible code. __ 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 and provide commented, minimal, self-contained, reproducible code.
Re: [R] Large matrix into a vector
A matrix is just a vector with a dim attribute, so if you remove the dim attribute it'll be a vector. The elements of a matrix are stored columnwise so you'll get just what you want, if i get your question right. g - matrix(1:6, nc=2, nr=3) g [,1] [,2] [1,]14 [2,]25 [3,]36 dim(g) - NULL g [1] 1 2 3 4 5 6 Gabor On Wed, Mar 28, 2007 at 10:27:48AM -0700, A Ezhil wrote: Hi, I have a matrix HR(9x27). I would like to make a single vector with elements: t(HR[,1]) followed by t(HR[,2]) and then t(HR[,3] ... etc. Is there any neat way of converting this matrix into a vector rather doing something like c(t(HR[,1]), t(HR[,2]), t(HR[,3]) ..)? Thanks in Advance. Kind regards, Ezhil TV dinner still cooling? Check out Tonight's Picks on Yahoo! TV. __ 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 and provide commented, minimal, self-contained, reproducible code. -- Csardi Gabor [EMAIL PROTECTED]MTA RMKI, ELTE TTK __ 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 and provide commented, minimal, self-contained, reproducible code.
Re: [R] Large matrix into a vector
On Wed, 2007-03-28 at 10:27 -0700, A Ezhil wrote: Hi, I have a matrix HR(9x27). I would like to make a single vector with elements: t(HR[,1]) followed by t(HR[,2]) and then t(HR[,3] ... etc. Is there any neat way of converting this matrix into a vector rather doing something like c(t(HR[,1]), t(HR[,2]), t(HR[,3]) ..)? Keep in mind that a matrix is simply a vector, with a 'dim' attribute. In addition, the matrix elements are stored in column order, so: mat - matrix(1:(9 * 27), ncol = 27) mat [,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10] [,11] [,12] [1,]1 10 19 28 37 46 55 64 738291 100 [2,]2 11 20 29 38 47 56 65 748392 101 [3,]3 12 21 30 39 48 57 66 758493 102 [4,]4 13 22 31 40 49 58 67 768594 103 [5,]5 14 23 32 41 50 59 68 778695 104 [6,]6 15 24 33 42 51 60 69 788796 105 [7,]7 16 25 34 43 52 61 70 798897 106 [8,]8 17 26 35 44 53 62 71 808998 107 [9,]9 18 27 36 45 54 63 72 819099 108 [,13] [,14] [,15] [,16] [,17] [,18] [,19] [,20] [,21] [,22] [,23] [1,] 109 118 127 136 145 154 163 172 181 190 199 [2,] 110 119 128 137 146 155 164 173 182 191 200 [3,] 111 120 129 138 147 156 165 174 183 192 201 [4,] 112 121 130 139 148 157 166 175 184 193 202 [5,] 113 122 131 140 149 158 167 176 185 194 203 [6,] 114 123 132 141 150 159 168 177 186 195 204 [7,] 115 124 133 142 151 160 169 178 187 196 205 [8,] 116 125 134 143 152 161 170 179 188 197 206 [9,] 117 126 135 144 153 162 171 180 189 198 207 [,24] [,25] [,26] [,27] [1,] 208 217 226 235 [2,] 209 218 227 236 [3,] 210 219 228 237 [4,] 211 220 229 238 [5,] 212 221 230 239 [6,] 213 222 231 240 [7,] 214 223 232 241 [8,] 215 224 233 242 [9,] 216 225 234 243 as.vector(mat) [1] 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 [17] 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 [33] 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 [49] 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 [65] 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 [81] 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 [97] 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 [113] 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 [129] 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 [145] 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 [161] 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 [177] 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 [193] 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 [209] 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 [225] 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 [241] 241 242 243 HTH, Marc Schwartz __ 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 and provide commented, minimal, self-contained, reproducible code.
Re: [R] Large matrix into a vector
A Ezhil wrote: I have a matrix HR(9x27). I would like to make a single vector with elements: t(HR[,1]) followed by t(HR[,2]) and then t(HR[,3] ... etc. Is there any neat way of converting this matrix into a vector rather doing something like c(t(HR[,1]), t(HR[,2]), t(HR[,3]) ..)? It might be simpler than you thought... HR - matrix(1:(9*27), nrow=9) # just to create a 9x27 matrix c(HR) # oops, here it is! Alberto Monteiro __ 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 and provide commented, minimal, self-contained, reproducible code.
Re: [R] Large matrix into a vector
We have already seen three solutions. I don't like to see the use of c() for its side effects. In this case Marc's as.vector seems to me to be self-explanatory, and that is a virtue in programming that is too often undervalued. On Wed, 28 Mar 2007, Marc Schwartz wrote: On Wed, 2007-03-28 at 10:27 -0700, A Ezhil wrote: Hi, I have a matrix HR(9x27). I would like to make a single vector with elements: t(HR[,1]) followed by t(HR[,2]) and then t(HR[,3] ... etc. Is there any neat way of converting this matrix into a vector rather doing something like c(t(HR[,1]), t(HR[,2]), t(HR[,3]) ..)? Keep in mind that a matrix is simply a vector, with a 'dim' attribute. In addition, the matrix elements are stored in column order, so: mat - matrix(1:(9 * 27), ncol = 27) mat [,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10] [,11] [,12] [1,]1 10 19 28 37 46 55 64 738291 100 [2,]2 11 20 29 38 47 56 65 748392 101 [3,]3 12 21 30 39 48 57 66 758493 102 [4,]4 13 22 31 40 49 58 67 768594 103 [5,]5 14 23 32 41 50 59 68 778695 104 [6,]6 15 24 33 42 51 60 69 788796 105 [7,]7 16 25 34 43 52 61 70 798897 106 [8,]8 17 26 35 44 53 62 71 808998 107 [9,]9 18 27 36 45 54 63 72 819099 108 [,13] [,14] [,15] [,16] [,17] [,18] [,19] [,20] [,21] [,22] [,23] [1,] 109 118 127 136 145 154 163 172 181 190 199 [2,] 110 119 128 137 146 155 164 173 182 191 200 [3,] 111 120 129 138 147 156 165 174 183 192 201 [4,] 112 121 130 139 148 157 166 175 184 193 202 [5,] 113 122 131 140 149 158 167 176 185 194 203 [6,] 114 123 132 141 150 159 168 177 186 195 204 [7,] 115 124 133 142 151 160 169 178 187 196 205 [8,] 116 125 134 143 152 161 170 179 188 197 206 [9,] 117 126 135 144 153 162 171 180 189 198 207 [,24] [,25] [,26] [,27] [1,] 208 217 226 235 [2,] 209 218 227 236 [3,] 210 219 228 237 [4,] 211 220 229 238 [5,] 212 221 230 239 [6,] 213 222 231 240 [7,] 214 223 232 241 [8,] 215 224 233 242 [9,] 216 225 234 243 as.vector(mat) [1] 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 [17] 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 [33] 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 [49] 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 [65] 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 [81] 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 [97] 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 [113] 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 [129] 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 [145] 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 [161] 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 [177] 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 [193] 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 [209] 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 [225] 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 [241] 241 242 243 HTH, Marc Schwartz __ 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 and provide commented, minimal, self-contained, reproducible code. -- Brian D. Ripley, [EMAIL PROTECTED] Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ University of Oxford, Tel: +44 1865 272861 (self) 1 South Parks Road, +44 1865 272866 (PA) Oxford OX1 3TG, UKFax: +44 1865 272595 __ 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 and provide commented, minimal, self-contained, reproducible code.
Re: [R] Large matrix into a vector
Is this something like what you want? ab - rep(1,4) bb - rep(2,4) cc - rep(3,4) mydata - data.frame(ab,bb,cc) unlist(mydata) unlist(data.frame(t(mydata))) --- A Ezhil [EMAIL PROTECTED] wrote: Hi, I have a matrix HR(9x27). I would like to make a single vector with elements: t(HR[,1]) followed by t(HR[,2]) and then t(HR[,3] ... etc. Is there any neat way of converting this matrix into a vector rather doing something like c(t(HR[,1]), t(HR[,2]), t(HR[,3]) ..)? Thanks in Advance. Kind regards, Ezhil TV dinner still cooling? Check out Tonight's Picks on Yahoo! TV. __ 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 and provide commented, minimal, self-contained, reproducible code. __ 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 and provide commented, minimal, self-contained, reproducible code.
Re: [R] Large matrix into a vector
On Wed, 2007-03-28 at 19:55 -0200, Alberto Monteiro wrote: Prof Brian Ripley wrote: We have already seen three solutions. I don't like to see the use of c() for its side effects. In this case Marc's as.vector seems to me to be self-explanatory, and that is a virtue in programming that is too often undervalued. I agree; but for our enlightnment, what are the side effects of c()? Alberto Monteiro I believe that Prof. Ripley is referring to the following, from the Details section in ?c: c is sometimes used for its side effect of removing attributes except names, for example to turn an array into a vector. as.vector is a more intuitive way to do this, but also drops names. There are also examples in ?c of this behavior. HTH, Marc __ 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 and provide commented, minimal, self-contained, reproducible code.
Re: [R] Large matrix into a vector
Prof Brian Ripley wrote: We have already seen three solutions. I don't like to see the use of c() for its side effects. In this case Marc's as.vector seems to me to be self-explanatory, and that is a virtue in programming that is too often undervalued. I agree; but for our enlightnment, what are the side effects of c()? Alberto Monteiro __ 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 and provide commented, minimal, self-contained, reproducible code.
Re: [R] Large matrix into a vector
Marc Schwartz [EMAIL PROTECTED] writes: On Wed, 2007-03-28 at 19:55 -0200, Alberto Monteiro wrote: Prof Brian Ripley wrote: We have already seen three solutions. I don't like to see the use of c() for its side effects. In this case Marc's as.vector seems to me to be self-explanatory, and that is a virtue in programming that is too often undervalued. I agree; but for our enlightnment, what are the side effects of c()? Alberto Monteiro I believe that Prof. Ripley is referring to the following, from the Details section in ?c: c is sometimes used for its side effect of removing attributes except names, for example to turn an array into a vector. as.vector is a more intuitive way to do this, but also drops names. There are also examples in ?c of this behavior. The terminology is a bit unfortunate, though. Side effect usually means an effect that is not reflected in the return value of a function, like printing, plotting, or assignment. -- O__ Peter Dalgaard Øster Farimagsgade 5, Entr.B c/ /'_ --- Dept. of Biostatistics PO Box 2099, 1014 Cph. K (*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918 ~~ - ([EMAIL PROTECTED]) FAX: (+45) 35327907 __ 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 and provide commented, minimal, self-contained, reproducible code.
