Henrik,

  Thanks! I was just recommending the package to another fellow who is
learning R as I am. I was going crazy. Jorge gave me a solution that works,
however the data set I'm working with is huge so I'm hoping that switching
to your package will give both readability and performance improvements.

On Sun, Apr 18, 2010 at 2:47 AM, Henrik Bengtsson <hb@stat.berkeley.edu>wrote:

> On Sun, Apr 18, 2010 at 7:26 AM, steven mosher <moshersteven@gmail.com>
> wrote:
> > Ya I got that result but fixing it was a mystery. especially since I will
> > eventually want to subtract the row max from the row Min ( or calculate
> the
> > range)
> > if a matrix thus is:
> >
> >   [,1] [,2] [,3]
> > [1,]   NA   NA   NA
> > [2,]    2    5    8
> > [3,]   NA    6    9
> >
> > and apply(m,1,max,na.rm=TRUE)
> >
> > yeilds
> >
> > [1] -Inf    8    9
> >
> > Then  rowmin yeilds
> >
> > [1] -Inf    2    6
> >
> > need to see what happens if I subtract these two vectors.
> >
> >
> >     [,1] [,2] [,3]
> > [1,]   NA   NA   NA
> > [2,]    2    5    8
> > [3,]   NA    6    9
> >> rmax<-apply(m,1,max,na.rm=TRUE)
> > Warning message:
> > In FUN(newX[, i], ...) : no non-missing arguments to max; returning -Inf
> >> rmax
> > [1] -Inf    8    9
> >> rmin<-apply(m,1,min,na.rm=TRUE)
> > Warning message:
> > In FUN(newX[, i], ...) : no non-missing arguments to min; returning Inf
> >> rmin
> > [1] Inf   2   6
> >> rmax-rmin
> > [1] -Inf    6    3
> >> rrange<-rmax-rmin
> >> rrange
> > [1] -Inf    6    3
> >
> >
> > The final maxtrix may have a large number of these -Inf..
> >
> > I Was looking at maxtrixStats  package but it still beta
>
> The matrixStats package is labelled "beta", because the author of it
> is *extremely* picky when it comes to bumping code up to be labelled
> "release"; he often requires a code base to be stable for years before
> removing the label "beta".  I would give matrixStats' rowMaxs() a try.
>
> /Henrik
> (author of matrixStats)
>
> >
> >
> > On Sat, Apr 17, 2010 at 10:01 PM, David Winsemius <
> dwinsemius@comcast.net>wrote:
> >
> >>
> >> On Apr 18, 2010, at 12:16 AM, steven mosher wrote:
> >>
> >>  Is there a simple way to calculate the maximum for a row or column of a
> >>> matrix when there are NA,s present.
> >>>
> >>> # given a matrix that has any number of NA per row
> >>>
> >>>> m<-matrix(c(seq(1,9)),nrow=3)
> >>>> m
> >>>>
> >>>    [,1] [,2] [,3]
> >>> [1,]    1    4    7
> >>> [2,]    2    5    8
> >>> [3,]    3    6    9
> >>>
> >>>> m[3,1]=NA
> >>>> m[1,]=NA
> >>>> m
> >>>>
> >>>    [,1] [,2] [,3]
> >>> [1,]   NA   NA   NA
> >>> [2,]    2    5    8
> >>> [3,]   NA    6    9
> >>>
> >>> # applying max to rows doesnt work as max returns
> >>> # NA if any of the elements is NA.
> >>>
> >>>> row_max<-apply(m,1,max)
> >>>> row_max
> >>>>
> >>> [1] NA  8 NA
> >>>
> >>> # my desired result given m would be:
> >>> #  NA, 8, 9
> >>>
> >>
> >> Not exactly your desired result, but surely you could fix that:
> >>
> >> > row_max<-apply(m,1,max, na.rm=TRUE)
> >> Warning message:
> >> In FUN(newX[, i], ...) : no non-missing arguments to max; returning -Inf
> >> > row_max
> >> [1] -Inf    8    9
> >>
> >>
> >>
> >>
> >>>        [[alternative HTML version deleted]]
> >>>
> >>> ______________________________________________
> >>> R-help@r-project.org 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.
> >>>
> >>
> >> David Winsemius, MD
> >> West Hartford, CT
> >>
> >>
> >
> >        [[alternative HTML version deleted]]
> >
> > ______________________________________________
> > R-help@r-project.org 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.
> >
>

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