I am performing a batch correction with Bioconductor.

For the files in the same batch, I use the function rma() to normalize the data. This function calls return ExpressionSet objects that I combine all together into a unique vector.

When I have a batch containing only one file, I cannot run rma. I keep the file the same way it is, which is a ExpressionFeatureSet. Then, I would like to add this object to the vector, but I cannot because it's a different datatype.

I would like to convert this ExpressionFeatureSet variable to a ExpressionSet object. How can I do it?

thanks