Re: [R] NA in table with integer types
NaN only applies to double values: there is no integer NaN (nor Inf nor -Inf). The difference is clear from factor(x, exclude=NaN) [1] 1233NA Levels: 1 2 3 NA factor(as.integer(x), exclude=NaN) [1] 1233NA Levels: 1 2 3 If you read ?factor it says exclude: a vector of values to be excluded when forming the set of levels. This should be of the same type as 'x', and will be coerced if necessary. and as.integer(NaN) is integer NA. So factor(as.integer(x), exclude=NaN) is the same as factor(as.integer(x), exclude=NA). On Thu, 7 Apr 2005, Paul Rathouz wrote: Hi -- I am having the following problem with table() when applied to vectors of type (mode) integer. When I use the table() command, I can *only obtain an entry in the table for NA values by using exclude=NULL*. Just issuing exclude=NaN will not do it. See below, where x is double at first, and then coerced to integer and notice the difference. Is this a bug or is there something that I do not understand about the integer data type? That is, is there some other value besides NA and NaN that missing integers take? Thanks -- pr -- x - c(1,2,3,3,NA) is.double(x) [1] TRUE table(x,exclude=NA) x 1 2 3 1 1 2 table(x,exclude=NaN) x 123 NA 1121 table(x,exclude=NULL) x 123 NA 1121 x - as.integer(x) x [1] 1 2 3 3 NA is.na(x) [1] FALSE FALSE FALSE FALSE TRUE is.integer(x) [1] TRUE table(x,exclude=NA) x 1 2 3 1 1 2 table(x,exclude=NaN) x 1 2 3 1 1 2 table(x,exclude=NULL) x 123 NA 1121 -- 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
Re: [R] NA in table with integer types
OK. Thanks. So, if you use table() on a factor that contains NA's, but for which NA is not a level, is there any way to get table to generate an entry for the NAs? For example, in below, even exclude=NULL will not give me an entry for NA on the factor y: x - c(1,2,3,3,NA) y - factor(x) y [1] 1233NA Levels: 1 2 3 table(y,exclude=NA) y 1 2 3 1 1 2 table(y,exclude=NaN) y 1 2 3 1 1 2 table(y,exclude=NULL) y 1 2 3 1 1 2 On Fri, 8 Apr 2005, Prof Brian Ripley wrote: NaN only applies to double values: there is no integer NaN (nor Inf nor -Inf). The difference is clear from factor(x, exclude=NaN) [1] 1233NA Levels: 1 2 3 NA factor(as.integer(x), exclude=NaN) [1] 1233NA Levels: 1 2 3 If you read ?factor it says exclude: a vector of values to be excluded when forming the set of levels. This should be of the same type as 'x', and will be coerced if necessary. and as.integer(NaN) is integer NA. So factor(as.integer(x), exclude=NaN) is the same as factor(as.integer(x), exclude=NA). [rest deleted] == Paul Rathouz, Assoc. Professor ph 773-834-1970 Dept. of Health Studies, Rm. W-264 fax 773-702-1979 University of Chicago[EMAIL PROTECTED] 5841 S. Maryland Ave. MC 2007 Chicago, IL 60637 __ 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] NA in table with integer types
On Apr 8, 2005 9:05 AM, Paul Rathouz [EMAIL PROTECTED] wrote: OK. Thanks. So, if you use table() on a factor that contains NA's, but for which NA is not a level, is there any way to get table to generate an entry for the NAs? For example, in below, even exclude=NULL will not give me an entry for NA on the factor y: x - c(1,2,3,3,NA) y - factor(x) y [1] 1233NA Levels: 1 2 3 summary(y) __ 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] NA in table with integer types
On Fri, 8 Apr 2005, Paul Rathouz wrote: OK. Thanks. So, if you use table() on a factor that contains NA's, but for which NA is not a level, is there any way to get table to generate an entry for the NAs? For example, in below, even exclude=NULL will not give me an entry for NA on the factor y: I think this very clear from the help page: exclude: values to use in the exclude argument of 'factor' when interpreting non-factor objects; if specified, levels to remove from all factors in Only when 'exclude' is specified (i.e., not by default), will 'table' drop levels of factor arguments potentially. and you cannot remove a level that is not there. You seem to be persisting in not understanding: 'exclude' is supposed to be the same type as x (or its levels), and you have given logical and numeric values, not character ones. x - c(1,2,3,3,NA) y - factor(x) y [1] 1233NA Levels: 1 2 3 table(y,exclude=NA) y 1 2 3 1 1 2 table(y,exclude=NaN) y 1 2 3 1 1 2 table(y,exclude=NULL) y 1 2 3 1 1 2 On Fri, 8 Apr 2005, Prof Brian Ripley wrote: NaN only applies to double values: there is no integer NaN (nor Inf nor -Inf). The difference is clear from factor(x, exclude=NaN) [1] 1233NA Levels: 1 2 3 NA factor(as.integer(x), exclude=NaN) [1] 1233NA Levels: 1 2 3 If you read ?factor it says exclude: a vector of values to be excluded when forming the set of levels. This should be of the same type as 'x', and will be coerced if necessary. and as.integer(NaN) is integer NA. So factor(as.integer(x), exclude=NaN) is the same as factor(as.integer(x), exclude=NA). [rest deleted] == Paul Rathouz, Assoc. Professor ph 773-834-1970 Dept. of Health Studies, Rm. W-264 fax 773-702-1979 University of Chicago[EMAIL PROTECTED] 5841 S. Maryland Ave. MC 2007 Chicago, IL 60637 == -- 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
Re: [R] NA in table with integer types
On 8 Apr 2005 at 14:20, Prof Brian Ripley wrote: On Fri, 8 Apr 2005, Paul Rathouz wrote: OK. Thanks. So, if you use table() on a factor that contains NA's, but for which NA is not a level, is there any way to get table to generate an entry for the NAs? For example, in below, even exclude=NULL will not give me an entry for NA on the factor y: Hi Use exclude in factor not in table x-sample(1:3, 10, replace=T) x[5:6]-NA table(x) x 1 2 3 5 2 1 y-factor(x) y [1] 1123NA NA 1121 Levels: 1 2 3 table(y) # no entry for NA y 1 2 3 5 2 1 factor(y,exclude=NULL) #make NA a level in factor y [1] 1123NA NA 1121 Levels: 1 2 3 NA table(y) # shows you entry for NA y 123 NA 5212 I think this very clear from the help page: exclude: values to use in the exclude argument of 'factor' when interpreting non-factor objects; if specified, levels to remove from all factors in Only when 'exclude' is specified (i.e., not by default), will 'table' drop levels of factor arguments potentially. and you cannot remove a level that is not there. You seem to be persisting in not understanding: 'exclude' is supposed to be the same type as x (or its levels), and you have given logical and numeric values, not character ones. x - c(1,2,3,3,NA) y - factor(x) y [1] 1233NA Levels: 1 2 3 table(y,exclude=NA) y 1 2 3 1 1 2 table(y,exclude=NaN) y 1 2 3 1 1 2 table(y,exclude=NULL) y 1 2 3 1 1 2 On Fri, 8 Apr 2005, Prof Brian Ripley wrote: NaN only applies to double values: there is no integer NaN (nor Inf nor -Inf). The difference is clear from factor(x, exclude=NaN) [1] 1233NA Levels: 1 2 3 NA factor(as.integer(x), exclude=NaN) [1] 1233NA Levels: 1 2 3 If you read ?factor it says exclude: a vector of values to be excluded when forming the set of levels. This should be of the same type as 'x', and will be coerced if necessary. and as.integer(NaN) is integer NA. So factor(as.integer(x), exclude=NaN) is the same as factor(as.integer(x), exclude=NA). [rest deleted] == Paul Rathouz, Assoc. Professor ph 773-834-1970 Dept. of Health Studies, Rm. W-264 fax 773-702-1979 University of Chicago[EMAIL PROTECTED] 5841 S. Maryland Ave. MC 2007 Chicago, IL 60637 == -- 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 Petr Pikal [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] NA in table with integer types
Hi -- I am having the following problem with table() when applied to vectors of type (mode) integer. When I use the table() command, I can *only obtain an entry in the table for NA values by using exclude=NULL*. Just issuing exclude=NaN will not do it. See below, where x is double at first, and then coerced to integer and notice the difference. Is this a bug or is there something that I do not understand about the integer data type? That is, is there some other value besides NA and NaN that missing integers take? Thanks -- pr -- x - c(1,2,3,3,NA) is.double(x) [1] TRUE table(x,exclude=NA) x 1 2 3 1 1 2 table(x,exclude=NaN) x 123 NA 1121 table(x,exclude=NULL) x 123 NA 1121 x - as.integer(x) x [1] 1 2 3 3 NA is.na(x) [1] FALSE FALSE FALSE FALSE TRUE is.integer(x) [1] TRUE table(x,exclude=NA) x 1 2 3 1 1 2 table(x,exclude=NaN) x 1 2 3 1 1 2 table(x,exclude=NULL) x 123 NA 1121 R.version _ platform powerpc-apple-darwin6.8 arch powerpc os darwin6.8 system powerpc, darwin6.8 status major2 minor0.1 year 2004 month11 day 15 language R -- == Paul Rathouz, Assoc. Professor ph 773-834-1970 Dept. of Health Studies, Rm. W-264 fax 773-702-1979 University of Chicago[EMAIL PROTECTED] 5841 S. Maryland Ave. MC 2007 Chicago, IL 60637 __ 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
