Merging series matrix files

Question

[ghataksoumyakanti]

Hi,

I have four sets of microarray data that I was trying to merge into 1.I was doing so by using the R function inSilicoMerging. However,I could not download the datasets directly from internet using the getDataSet fuction.Thus I manually downloaded them and then annotated them with gene symbols.But Now I cannot store them as eset files and thus cannot merge them easily based on my gene symbol.

Can Someone tell how to merge two or more microarray gene expression datasets .ALso Is there a way I can convert the manually downloaded series expression matrix files into whatever format the merge function wats me to convert in.

Thanks