aggregate - How to calculate the number of pixels used when aggregating in R? -

i have 2 binary files (1440*720) same dimensions: want take average of first file based on second file values (intervals),the values of file range 1 7. whenever values in second file range between 0-1, calculate corresponding average in first file , return result,do same thing 2-3,3-4,5-6,7-8.no data values assigned na.

1- read first file :

conne <- file("c:\\corr.bin","rb") corr <- readbin(conne, numeric(), size=4, n=1440*720, signed=true) #please assume matrix of 720*1440 dimnsions 

2- read second file :

conne1 <- file("c:\\use.bin","rb") cus <- readbin(conne1, numeric(), size=4, n=1440*720, signed=true) #please assume matrix of 720*1440 dimnsions 

calculate:

cusbreak <- cut(cus,1:8)) aggregate(corr, list(cusbreak), mean, na.rm=true) 

this worked fine need know number of pixels used , percentage out of total number of pixels.

  results    group.1   x    number of pixels    percentage (out of total number of pixcels)  1   (0,1] 0.5      ?                       ?  2   (1,2] 0.23     ?                       ?  3   (2,3] 0.65     ?                       ?  4   (3,4] 0.3      ?                       ?  5   (4,5] 0.36 

make function use in aggregate return more 1 value. example:

aggregate(corr, list(cusbreak), function(values){     c( "x"       = mean(values),        "pixels"  = length(values),        "percent" = length(values) / length(corr) * 100     )  }, na.rm=true)