[R] Median on second group of CSV file produce Na
David Winsemius
dwinsemius at comcast.net
Tue Sep 1 20:12:41 CEST 2015
On Sep 1, 2015, at 6:48 AM, shawin wrote:
> The str() out come is :
>
> chr [1:31099, 1:8] " 9.329651" " 8.583304" " 9.284229" " 9.746094"
> "10.200084" " 9.249863" " 7.979661" "11.271934" ...
> - attr(*, "dimnames")=List of 2
> ..$ : NULL
> ..$ : chr [1:8] "GSM215579.CEL" "GSM215580.CEL" "GSM215581.CEL"
> "GSM215582.CEL" ...
>
So the matrix you thought was numeric is actually a character-object. The median function returns NA for character arguments. I'm seeing spaces in front of the decimal numbers so appears your input statements need to be somehow adjusted, or you need to coerce the matrix to numeric. The colClasses argument to read.table and cousins should be used more often.
--
David.
> On Tue, Sep 1, 2015 at 2:32 PM, Michael Dewey-3 [via R] <
> ml-node+s789695n4711716h95 at n4.nabble.com> wrote:
>
>> What happened when you did summary(y) or str(y)?
>>
>> On 01/09/2015 08:57, Navien wrote:
>>
>>> Dear Michael ,
>>>
>>> Thank you very much for your reply , kindly please can i send you the
>>> program and data please , y is shown a normal csv file no issue with it
>> :(
>>>
>>>
>>> Kind Regards
>>>
>>> On Tue, Sep 1, 2015 at 8:36 AM, Michael Dewey-3 [via R] <
>>> [hidden email] <http:///user/SendEmail.jtp?type=node&node=4711716&i=0>>
>> wrote:
>>>
>>>> Dear Shawin
>>>>
>>>> You probably did not get an answer because
>>>> 1 - you seem to have posted in HTML which mangled your post into
>>>> unreadability
>>>> 2 - there seem to be lots of lines which do not do anything germane to
>>>> the problem.
>>>>
>>>> Why not try summary(y) or str(y) before you convert it to a matrix and
>>>> see what it says?
>>>>
>>>> On 31/08/2015 20:46, shawin wrote:
>>>>
>>>>> I have an issue ans i posted it , so i would like to receive a
>> solution
>>>>> please
>>>>>
>>>>> On Mon, Aug 31, 2015 at 8:35 PM, shawin [via R] <
>>>>> [hidden email] <http:///user/SendEmail.jtp?type=node&node=4711707&i=0>>
>>
>>>> wrote:
>>>>>
>>>>>> I have a data frame csv file and I'm trying to calculate median for
>>>> each
>>>>>> group separately row by row . When I separate the data frame in two
>>>> groups
>>>>>> and calculate the median for each one, I am getting an NA result for
>>>> the
>>>>>> second group :
>>>>>> the data
>>>>>> x1 x2 x3 x4 x5 x6 x7 y1 y2 y3 y4 y5 y6 y7 y8
>>>>>> 9.488404158 9.470895414 9.282433728 9.366707445 9.955383045
>> 9.640816474
>>>>>> 9.606262272 9.329651027 9.434541611 9.473922432 9.311412966
>> 9.3154885
>>>>>> 9.434977488 9.470895414 9.764258059
>>>>>> 8.630629966 8.55831075 8.788391003 8.576231135 8.671587906
>> 8.842979993
>>>>>> 8.861958856 8.58330436 8.603596508 8.570129609 8.59798922
>> 8.572686772
>>>>>> 8.679751791 8.663950953 8.432875347
>>>>>> 9.354748885 9.367668838 9.259952558 9.421538213 9.554635162
>> 9.603744578
>>>>>> 9.452197983 9.284228877 9.404607878 9.317737979 9.343115301
>> 9.310644266
>>>>>> 9.27227486 9.360337823 9.44706281
>>>>>> 9.944863964 9.950427516 10.19101759 10.07350804 10.03269879
>> 10.1307908
>>>>>> 10.03487287 9.74609383 9.886379007 9.775472567 10.036596
>>>> 9.544738458
>>>>>> 9.699611598 9.911962567
>>>>>> 9.625804277
>>>>>>
>>>>>>
>>>>>> Code:
>>>>>>
>>>>>> rowN <- nrow(AT1)
>>>>>> MD1<-vector(length=rowN)
>>>>>> MD2<-vector(length=rowN)
>>>>>>
>>>>>> MD1[1:rowN]<-NA
>>>>>> MD2[1:rowN]<-NA
>>>>>>
>>>>>>
>>>>>> x<- AT1[,c(2,3,4,5,6,7,8) ]
>>>>>> write.csv(x,"x.csv",row.names=TRUE)
>>>>>> x<-as.matrix(x)
>>>>>> for(i in 2:rowN) {
>>>>>> MD1[i]=median(x[i,])
>>>>>> }
>>>>>> write.csv(MD1,"MD1.csv",row.names=TRUE)
>>>>>>
>>>>>> y<- AT1[,c(9,10,11,12,13,14,15,16)]
>>>>>> write.csv(y,"y.csv",row.names=TRUE)
>>>>>> y<-as.matrix(y)
>>>>>> for(j in 2:rowN) {
>>>>>> MD2[j]=median(y[j,])
>>>>>> }
>>>>>> write.csv(MD2,"MD2.csv",row.names=TRUE)
>>>>>>
>>>>>>
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>>>>>> <
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>>>>>
>>>>>
>>>>>
>>>>>
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>>>> --
>>>> Michael
>>>> http://www.dewey.myzen.co.uk/home.html
>>>>
>>>> ______________________________________________
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>>>> <
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>>>>
>>>
>>>
>>>
>>>
>>> --
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>>> ______________________________________________
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>> mailing list -- To UNSUBSCRIBE and more, see
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>> --
>> Michael
>> http://www.dewey.myzen.co.uk/home.html
>>
>> ______________________________________________
>> [hidden email] <http:///user/SendEmail.jtp?type=node&node=4711716&i=3>
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>> 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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>
>
>
>
> --
> View this message in context: http://r.789695.n4.nabble.com/Median-on-second-group-of-CSV-file-produce-Na-tp4711689p4711718.html
> Sent from the R help mailing list archive at Nabble.com.
> [[alternative HTML version deleted]]
>
> ______________________________________________
> R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
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> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
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David Winsemius
Alameda, CA, USA
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