I just want to know how to use R bioconductor for the 3 sets of microarray data of schizophrenia and whats it's steps, please answer me?
If you google the words in the title of your post, you'll find an array of good documentation. Please make some attempt to do some research before asking a question. The result will be better for everyone.
Read the Limma Userguide, as mentioned by Fereshteh, it's like a mini-bible on differential gene expression measurements.
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First: normalize your data based on the array (CEL or txt)
sharing some naive codes for microarray normalization in R with whom are too new in R alike me
Second: use limma for differential expression
When I did not know how to use R, I used to use geworkbench to do so
Just download and install that, then upload your data and use t-test or so on for differential expression