how to calculate gene probability from gene expression matrix

Question

[Michel Edwar]

i have an expression table like this

       sample1     sample 2     sample3
gene1  x1          x2           x3
gene2  y1          y2           y3
gene3  z1          z2           z3

how can i calculate the probability of gene 1 ? thanks

[Kevin Blighe]

I have edited your post to make the formatting more clear. Use the '101 010' button in the future when you are pasting code or output from a command (highlight the text and then press the button).

Your question is also vague. You just want to check if the expression of gene1 is significantly different from everything else? A simple Student's t-test would work. In R Programming Language:

t.test(MyData["gene1", ], MyData[which(rownames(MyData)!="gene1"), ]

Please elaborate further on the origin of your data and what your goals are.

Kevin