Arguments
geneList
a numeric or integer vector of phenotypes in descending or ascending
order with elements named by their Entrez IDs (no duplicates nor NA values)
geneSet
a character vector of gene identifiers of a gene set
exponent
a single integer or numeric value used in weighting phenotypes in GSEA
filepath
a single character value specifying the directory where the GSEA plot
will be stored
filename
a single character value specifying the name of the file where the
GSEA plot will be stored
output
a single character value specifying the format of output image: "pdf" or
"png"
...
other arguments used by the function 'png' or 'pdf' such as width and height