To extract coordinates and NDVI value for each pixel

Hi,
Thank you Mathieu for your answer. I tried with write.matrix (MASS) but the
result don't change. I have not all the matrix. I want that all the matrix
appears on the 
console or to save it in a file (.txt). If I try a small Matrix for example
(Mat1[1:5,]) the result is correct but If I use the true size of my matrix
(Mat[1:5168101,] I have not all the matrix 
How can I save the entire matrix to a file (. txt)? 

I used this code:

library(raster)
adresse<-"C:\\Users\\Documents\\DISC D\\\Images282"
a <- raster(adresse)  
CentreRaster <- rasterToPoints(a)
PixelColonne <- as.data.frame(CentreRaster)
PixelColonne <- cbind(PixelColonne,coordonnee =

paste(PixelColonne[,1],PixelColonne[,2],sep=" "))

colnames(PixelColonne) <-

c("Longitude","Latitude","ValeurPixel","Coordonnees")

return(PixelColonne)
}
Mat1 <- RasterToColonne(adresse) 
Mat1[1:5168101,] 
library(MASS)
write.matrix(Mat1, file = "", sep = " ")

Thank you in advance 
Komine 


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