1)I installed R-1.7.0 in Sgi machine(irix6.5).I installed all the bioconductor packages too. After that i did put all my >cel files under one directory and then move into that directory and Start R.Then i gave library(affy) to load it. Welcome to Bioconductor To view some introductory material......... Simply type....... Creating a new generic function for "summary" in package Biobase {1} TRUE My question is did it reall yy load the package affy. 2)When i write data <-ReadAffy() it gives these: 1: the condition has length > 1 and only the first element will be used in: if (dim(intensity(cel)) != dim.intensity) stop(paste("CEL file dimension mismatch !\n(file", My question is how can i make it work to read my .cel file. I am sending you an example .cel file [CEL] Version=3 [HEADER] Cols=536 Rows=536 TotalX=536 TotalY=536 OffsetX=0 OffsetY=0 GridCornerUL=237 234 GridCornerUR=4492 243 GridCornerLR=4490 4508 GridCornerLL=235 4499 Axis-invertX=0 AxisInvertY=0 swapXY=0 DatHeader=[73..46225] MG2000062256AA:CLS=4733 RWS=4733 XIN=3 YIN=3 VE=17 2.0 06/22/ 0 11:15:55 GridVerify=Success Hu6800.1sq 6 Algorithm=Percentile AlgorithmParameters=Percentile:75;CellMargin:2;OutlierHigh:1.500;OutlierLow:1.004 [INTENSITY] NumberCells=287296 CellHeader=X Y MEAN STDV NPIXELS 0 0 1447.3 294.2 36 1 0 34282.8 4017.5 36 2 0 1528.0 244.9 36 3 0 33889.3 4679.7 36 4 0 1073.5 211.4 36 5 0 1493.8 235.2 36 6 0 26558.8 5903.9 36 7 0 1557.5 259.3 36 8 0 25951.8 3178.6 30 9 0 1497.0 292.3 36 10 0 26122.8 3989.7 36 11 0 1577.3 271.9 36 12 0 25029.8 4386.5 36 13 0 1454.8 229.0 36 14 0 25128.5 5666.1 36 15 0 1602.0 242.9 36 16 0 26180.0 6859.9 36 17 0 1652.8 304.7 36 18 0 26311.8 7985.2 36 19 0 1655.0 295.9 36 20 3)when i try to load tcl/tk it says: Loading required package: tcltk Error in firstlib(which.lib.loc, package) : Tcl/Tk support is not available on this syError: syntax error Please do help me out. Thanks RInku _________________________________________________________________ Mega movies. Mega prizes. http://server1.msn.co.in/sp03/hallmark/index.asp Switch to Hallmark channel.