add igraph library

bin/DEG.R

@@ -18,12 +18,13 @@ packages <- c("optparse", # to read arguments from a command line
               "gridExtra", # multiple plots on one page
               "grid", # multiple plots on one page for MAplots
               "RColorBrewer", # color in plots
+              "igraph", # new unmet dependency for mixOmics
               "mixOmics", # for heatmap plot
               "reshape2",  # reshape grouped data
               "knitr", # create a pdf file with images
               "markdown", # create a pdf file with images
-              "RJSONIO") # work with JSON file
-
+              "RJSONIO") # work with JSON file 
+              
 for(package in packages){
   # if package is installed locally, load
   if (!(package %in% rownames(installed.packages()))) {