druid_geneset: DRUID geneset
In diogocamacho/druid: Drug Indication Discoverer

This function generates the query gene set that is to be used as input into DRUID.

1 2	druid_geneset(dge_matrix, desired_effect = c("pos", "neg"), fold_thr, pvalue_thr, entrez, gene_space)

`dge_matrix`	This is a 2 column matrix for gene expression changes, where column 1 is the gene fold change and column 2 is the corresponding p-value for the fold change. NOTE: Use log2 of the fold changes as output, for example, from 'limma' or 'DESeq2'.
`desired_effect`	Desired effect for DRUID to run on: "pos" mimics query phenotype, "neg" reverts query phenotype. Defaults to "neg".
`fold_thr`	Threshold for the fold change to be considered. Defaults to 0 (i.e., log2(1), where fold change is not used as filter)
`pvalue_thr`	Threshold for the p-value of the fold change to be considered. Defaults to 0.05.
`entrez`	EntrezIDs for genes in differentially expressed set. Must be same order as the input matrix.
`gene_space`	EntrezIDs from TF.IDF matrix (column names of this matrix).