Re: [R] Automatic rounding of values after factors , converted to numeric, are multipled by a real number
Peter, Thank you for your response. I knew how close the values are to integers, but I still don't understand why I don't have control over how the numbers are displayed (rounded or not)? Thanks again, Gary Nelson. -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Peter Dalgaard Sent: Wednesday, October 19, 2005 3:45 PM To: Nelson, Gary (FWE) Cc: r-help@stat.math.ethz.ch Subject: Re: [R] Automatic rounding of values after factors , converted to numeric, are multipled by a real number Nelson, Gary (FWE) [EMAIL PROTECTED] writes: I am wondering if someone would have any suggestion about my issue? I have the following code: wgts-aggregate(subset(lendata,select=c(Length)),list(lendata$Cruise,l en data$Station,lendata$Region,lendata$Total),mean) wgts-wgts[order(wgts$Group.3,wgts$Group.1,wgts$Group.1),] names(wgts)-c(Cruise,Station,Region,Total,MLen) wgts$Total-as.numeric(levels(wgts$Total))[wgts$Total] wgts$swmean-with(wgts,wgts$Total*wgts$MLen) When I run it, I get: Cruise Station Region Total MLen swmean 32350 256 1 2 70.5141 52350 254 1 3 73.3220 62350 287 1 3 65.7197 92350 232 1 4 75.25000301 10 2350 294 1 4 56.0224 12 2350 301 1 5 70.2351 14 2350 316 1 6 67.3404 15 2350 255 1 7 55.0385 17 2350 285 1 8 73.5588 19 2350 212 110 57.5575 20 2350 250 110 61.5615 27 2350 221 124 95.29167 2287 33 2350 229 135 55.62857 1947 37 2350 293 147 53.82979 2530 38 2350 203 150 55.54000 2777 39 2350 248 155 63.30909 3482 41 2350 246 163 95.82540 6037 42 2350 265 168 55.54412 3777 43 2350 251 182 62.60976 5134 44 2350 234 185 57.21176 4863 Every value is correct except that the swmeans are rounded and I can't get values with the decimals fractions. I have tried as.double and have change the options(digits=7), but nothing seems to work. I have spent several hours combing manuals and archives. as far as I can see, the issue is that Total*MLen just *are* pretty close to being integers, e.g. 4863/85 [1] 57.21176 z - x$Total*x$MLen z - round(z) [1] 0.0 -0.1 0.1 0.0 0.0 0.0 -0.2 0.0 [9] 0.0 0.0 0.0 0.8 -0.5 0.00013 0.0 -0.5 [17] 0.00020 0.00016 0.00032 -0.00040 -- 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
Re: [R] Automatic rounding of values after factors , converted to numeric, are multipled by a real number
Nelson, Gary (FWE) [EMAIL PROTECTED] writes: Peter, Thank you for your response. I knew how close the values are to integers, but I still don't understand why I don't have control over how the numbers are displayed (rounded or not)? It's all in the conventions. The digits in print() and friends are significant digits, so we first round to that many significant digits, then discard trailing zeros, which is why 12.51 [1] 12.5 12.50001 [1] 12.50001 The exception is that we do not discard significant digits to the left of the decimal point, unless we are using scientific notation print(12345678,digits=2) [1] 1.2e+07 print(12345678,digits=5) [1] 12345678 (the scipen options controls the logic for switching notation). For finer control we have the formatC function: format(1234.1,digits=9) # same thing as with print() [1] 1234.1 format(1234.1,digits=8) [1] 1234 formatC(1234.1,digits=5,format=f) [1] 1234.1 formatC(1234.1,digits=4,format=f) [1] 1234. -- 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
Re: [R] Automatic rounding of values after factors , converted to numeric, are multipled by a real number
On Thu, 2005-10-20 at 16:20 +0200, Peter Dalgaard wrote: Nelson, Gary (FWE) [EMAIL PROTECTED] writes: Peter, Thank you for your response. I knew how close the values are to integers, but I still don't understand why I don't have control over how the numbers are displayed (rounded or not)? It's all in the conventions. The digits in print() and friends are significant digits, so we first round to that many significant digits, then discard trailing zeros, which is why 12.51 [1] 12.5 12.50001 [1] 12.50001 The exception is that we do not discard significant digits to the left of the decimal point, unless we are using scientific notation print(12345678,digits=2) [1] 1.2e+07 print(12345678,digits=5) [1] 12345678 (the scipen options controls the logic for switching notation). For finer control we have the formatC function: format(1234.1,digits=9) # same thing as with print() [1] 1234.1 format(1234.1,digits=8) [1] 1234 formatC(1234.1,digits=5,format=f) [1] 1234.1 formatC(1234.1,digits=4,format=f) [1] 1234. Also, sprintf(): sprintf(%.9f, 1234.1) [1] 1234.1 sprintf(%.4f, 1234.1) [1] 1234. sprintf(%12.4f, 1234.1) [1]1234. 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
[R] Automatic rounding of values after factors , converted to numeric, are multipled by a real number
I am wondering if someone would have any suggestion about my issue? I have the following code: wgts-aggregate(subset(lendata,select=c(Length)),list(lendata$Cruise,len data$Station,lendata$Region,lendata$Total),mean) wgts-wgts[order(wgts$Group.3,wgts$Group.1,wgts$Group.1),] names(wgts)-c(Cruise,Station,Region,Total,MLen) wgts$Total-as.numeric(levels(wgts$Total))[wgts$Total] wgts$swmean-with(wgts,wgts$Total*wgts$MLen) When I run it, I get: Cruise Station Region Total MLen swmean 32350 256 1 2 70.5141 52350 254 1 3 73.3220 62350 287 1 3 65.7197 92350 232 1 4 75.25000301 10 2350 294 1 4 56.0224 12 2350 301 1 5 70.2351 14 2350 316 1 6 67.3404 15 2350 255 1 7 55.0385 17 2350 285 1 8 73.5588 19 2350 212 110 57.5575 20 2350 250 110 61.5615 27 2350 221 124 95.29167 2287 33 2350 229 135 55.62857 1947 37 2350 293 147 53.82979 2530 38 2350 203 150 55.54000 2777 39 2350 248 155 63.30909 3482 41 2350 246 163 95.82540 6037 42 2350 265 168 55.54412 3777 43 2350 251 182 62.60976 5134 44 2350 234 185 57.21176 4863 Every value is correct except that the swmeans are rounded and I can't get values with the decimals fractions. I have tried as.double and have change the options(digits=7), but nothing seems to work. I have spent several hours combing manuals and archives. Any suggestions would be appreciated. * Gary A. Nelson Massachusetts Division of Marine Fisheries 30 Emerson Avenue Gloucester, MA 01930 Phone: (978) 282-0308 x114 Fax: (617) 727-3337 Email: [EMAIL PROTECTED] __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
Re: [R] Automatic rounding of values after factors , converted to numeric, are multipled by a real number
Nelson, Gary (FWE) [EMAIL PROTECTED] writes: I am wondering if someone would have any suggestion about my issue? I have the following code: wgts-aggregate(subset(lendata,select=c(Length)),list(lendata$Cruise,len data$Station,lendata$Region,lendata$Total),mean) wgts-wgts[order(wgts$Group.3,wgts$Group.1,wgts$Group.1),] names(wgts)-c(Cruise,Station,Region,Total,MLen) wgts$Total-as.numeric(levels(wgts$Total))[wgts$Total] wgts$swmean-with(wgts,wgts$Total*wgts$MLen) When I run it, I get: Cruise Station Region Total MLen swmean 32350 256 1 2 70.5141 52350 254 1 3 73.3220 62350 287 1 3 65.7197 92350 232 1 4 75.25000301 10 2350 294 1 4 56.0224 12 2350 301 1 5 70.2351 14 2350 316 1 6 67.3404 15 2350 255 1 7 55.0385 17 2350 285 1 8 73.5588 19 2350 212 110 57.5575 20 2350 250 110 61.5615 27 2350 221 124 95.29167 2287 33 2350 229 135 55.62857 1947 37 2350 293 147 53.82979 2530 38 2350 203 150 55.54000 2777 39 2350 248 155 63.30909 3482 41 2350 246 163 95.82540 6037 42 2350 265 168 55.54412 3777 43 2350 251 182 62.60976 5134 44 2350 234 185 57.21176 4863 Every value is correct except that the swmeans are rounded and I can't get values with the decimals fractions. I have tried as.double and have change the options(digits=7), but nothing seems to work. I have spent several hours combing manuals and archives. as far as I can see, the issue is that Total*MLen just *are* pretty close to being integers, e.g. 4863/85 [1] 57.21176 z - x$Total*x$MLen z - round(z) [1] 0.0 -0.1 0.1 0.0 0.0 0.0 -0.2 0.0 [9] 0.0 0.0 0.0 0.8 -0.5 0.00013 0.0 -0.5 [17] 0.00020 0.00016 0.00032 -0.00040 -- 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
