I have a large amount of data read in from over 140 excel files in the
format of x. r1 to r5 are repeat measures for a given Wavelength and
ANWC_NO.
I need to rearrange x into 3 columns, ANWC_NO,Wavelegth, value ie
ANWC_NO Wavelength r1
ANWC_NO Wavelength, r2
ANWC_NO Wavelength r3
etc...
I can rearrange the data using the code below, however all the columns
end up as strings, not numeric values. I cannot then summaries the
data, ( whcih I need to do in bins of wavelanght for each ANWC_NO)
> x
Wavelength r1 r2 r3 r4 r5 ANWC_NO
1 300 0.003126 0.005382 0.001094 0.012529 0.005632 39239
2 302 0.004924 0.006280 0.002366 0.015234 0.006204 39239
3 304 0.004769 0.005960 0.002759 0.015856 0.006804 39239
4 306 0.005181 0.006717 0.004033 0.017380 0.007675 39239
5 308 0.005872 0.008083 0.004429 0.018334 0.008504 39239
6 310 0.007164 0.010775 0.005949 0.019952 0.009594 39239
> y =NULL
> rows<-nrow(x)
> for(r in 1:rows){
+ for(c in 2:6){
+ row<-c(c(x[r,7]),as.numeric(c(x[r,1])),as.numeric(c(x[r,c])))
+ y<-rbind(y,row)
+ }}
> colnames(y)<-c("ANWC_NO","WAVELENGTH","VALUE")
> head (y)
ANWC_NO WAVELENGTH VALUE
row "39239" "300" "0.003126"
row "39239" "300" "0.005382"
row "39239" "300" "0.001094"
row "39239" "300" "0.012529"
row "39239" "300" "0.005632"
row "39239" "302" "0.004924"
> mean(y$VALUE)
Error in y$VALUE : $ operator is invalid for atomic vectors
how do I get the data arranged in three columns but maintaining
WavelENGTH and the values as numeric in a data.frame?
Many thanks
Nevil Amos
Monash University
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