Dear folks,
I would like to compare two unequal matrices. At the moment I realize
this with two for loop and an if function but that's definitely too slow
:(...
Here is my code:
for (i in 1:length(all_expressed_genes[,1])) {
for (j in 1:length(kegg_gene_pVal[,1])) {
if (all_expressed_genes[j,1] == kegg_gene_pVal[i,1]) {
kegg_gene_pVal[j,4] = all_expressed_genes[i,6]
}
}
}
Are there any faster solutions for that easy code? And why is R so
dramatically slow when using for, while or other loop functions?
Thanks in advance,
Paul
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