X-Git-Url: https://git.auder.net/?p=epclust.git;a=blobdiff_plain;f=epclust%2FR%2Futils.R;h=40b0a180fa2340f757094f663eb143feb1a2e3b1;hp=708367482bbd093ff18166d29d5df1968bdfb77b;hb=3eef8d3df59ded9a281cff51f79fe824198a7427;hpb=e205f2187f0ccdff00bffc47642392ec5e33214d

diff --git a/epclust/R/utils.R b/epclust/R/utils.R
index 7083674..40b0a18 100644
--- a/epclust/R/utils.R
+++ b/epclust/R/utils.R
@@ -10,28 +10,6 @@ toInteger <- function(x, condition)
 	x
 }
 
-writeCoeffs = function(coeffs)
-{
-	file = ".coeffs"
-	#.........
-	#C function (from data.frame, type of IDs ??! force integers ? [yes])
-	#return raw vector
-	#take raw vector, append it (binary mode) to a file
-#TODO: appendCoeffs() en C --> serialize et append to file
-}
-
-readCoeffs = function(indices)
-{
-	#......
-	file = ".coeffs"
-	#C function (from file name)
-}
-
-getSeries(data, rank=NULL, id=NULL)
-{
-	#TODO:
-}
-
 curvesToCoeffs = function(series, wf)
 {
 	L = length(series[1,])
@@ -43,3 +21,55 @@ curvesToCoeffs = function(series, wf)
 		rev( sapply( W, function(v) ( sqrt( sum(v^2) ) ) ) )
 	})
 }
+
+#data: matrix of double or connection
+serialize = function(data, file, type, nb_per_chunk)
+{
+	bin_data = file(file, "ab")
+	#write data length on first call
+	nbytes = ifelse(type=="double",8,4)
+	first_write = FALSE
+	if (file.info(file)$size == 0)
+	{
+		#number of items always on 8 bytes
+		writeBin(0L, bin_data, size=8) #,endian="little")
+		first_write = TRUE
+	}
+	if (is.matrix(data))
+	{
+		writeBin(t(data), bin_data, size=nbytes)
+		data_length = ncol(data)
+	}
+	else #if (is(data, "connection"))
+	{
+		if (first_write)
+		{
+			data_line = scan(data, double(), sep=",", nlines=1)
+			writeBin(data_line, bin_data, size=nbytes)
+			data_length = length(data_line)
+		}
+		repeat
+		{
+			data_chunk = scan(data, double(), sep=",", nlines=nb_per_chunk)
+			if (length(data_chunk)==0)
+				break
+			writeBin(data_chunk, bin_data, size=nbytes)
+		}
+	}
+	if (first_write)
+	{
+		#ecrire file_size-1 / (nbytes*nbWritten) en 0 dans bin_data ! ignored == file_size
+		ignored = seek(bin_data, 0)
+		writeBin(data_length, bin_data, size=8)
+	}
+	close(bin_data)
+}
+
+#TODO: read in binary file, always same structure
+getDataFromFile(indices, file, type)
+{
+	bin_data = file(file, "rb")
+	nbytes = ifelse(type=="double",8,4)
+	data_length = readBin(bin_data,"double",1,nbytes) #,endian="little")
+	t(sapply(indices, function(i) readBin(bin_data,"double",n=data_length,size=nbytes)))
+}