Hi Michael,
ok, solved.
Thanks for your support.
Bye

~ Francesco Brundu


On 7 April 2014 17:57, Michael Rutter <mar36@psu.edu> wrote:

>
>
> On 04/07/2014 11:36 AM, Francesco Brundu wrote:
>
>> Hi Michael, Rune,
>>
>> I checked with R 3.0.3, using sudo aptitude install
>> r-base=3.0.3-1precise0 r-base-core=3.0.3-1precise0
>> r-recommended=3.0.3-1precise0
>> and it seems it can be really a regression (now with 3.0.3 my problem
>> has disappeared)
>>
>> I posted some hours ago on Stack Overflow
>> http://stackoverflow.com/questions/22912936/why-r-
>> returns-na-when-computing-mean-on-non-null-matrix/22913923#22913923
>>
>> I think that read.table forces a matrix to be non numeric, while I
>> checked and all the matrix is only composed by floats. Having non
>> numeric data does not allow to do operations on this. Unfortunately I
>> cannot disclose the dataset. However if I can tell you more ask me.
>>
>> Thanks
>>
>
> The first entry in NEWS for R 3.1.0 is this:
>
>     * type.convert() (and hence by default read.table()) returns a
>       character vector or factor when representing a numeric input as a
>       double would lose accuracy.  Similarly for complex inputs.
>
>       If a file contains numeric data with unrepresentable numbers of
>       decimal places that are intended to be read as numeric, specify
>       colClasses in read.table() to be "numeric".
>
> The solution is given and the change will be seen in the release version
> of R 3.1.0 I will push later this week.  I have a feeling this will effect
> a number of users, but the solution is an easy fix.
>
>
> Michael
>
>
> --
> Dr. Michael A. Rutter
> Associate Professor of Statistics
> Program Coordinator, Mathematics
> Penn State Erie, The Behrend College
> Station Road
> Erie, PA 16563
> http://math.bd.psu.edu/faculty/rutter
>

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