--- a/aa_histogram.r	Thu Jul 14 07:29:56 2016 -0400
+++ b/aa_histogram.r	Tue Aug 02 08:30:23 2016 -0400
@@ -15,47 +15,47 @@
 absent.aa.by.id = read.table(absent.aa.by.id.file, sep="\t", fill=T, header=T, quote="")
 
 for(gene in genes){
-	
-	if(gene == ""){
-		mutations.by.id.gene = mutations.by.id[!grepl("unmatched", mutations.by.id$best_match),]
-		absent.aa.by.id.gene = absent.aa.by.id[!grepl("unmatched", absent.aa.by.id$best_match),]
-	} else {
-		mutations.by.id.gene = mutations.by.id[grepl(paste("^", gene, sep=""), mutations.by.id$best_match),]
-		absent.aa.by.id.gene = absent.aa.by.id[grepl(paste("^", gene, sep=""), absent.aa.by.id$best_match),]
-	}
-	if(nrow(mutations.by.id.gene) == 0){
-		next
-	}
-	
-	print(paste("nrow", gene, nrow(absent.aa.by.id.gene)))
-	
-	mutations.at.position = colSums(mutations.by.id.gene[,-c(1,2)])
-	aa.at.position = colSums(absent.aa.by.id.gene[,-c(1,2,3,4)])
 
-	dat_freq = mutations.at.position / aa.at.position
-	dat_dt = data.frame(i=1:length(dat_freq), freq=dat_freq)
+        if(gene == ""){
+                mutations.by.id.gene = mutations.by.id[!grepl("unmatched", mutations.by.id$best_match),]
+                absent.aa.by.id.gene = absent.aa.by.id[!grepl("unmatched", absent.aa.by.id$best_match),]
+        } else {
+                mutations.by.id.gene = mutations.by.id[grepl(paste("^", gene, sep=""), mutations.by.id$best_match),]
+                absent.aa.by.id.gene = absent.aa.by.id[grepl(paste("^", gene, sep=""), absent.aa.by.id$best_match),]
+        }
+        print(paste("nrow", gene, nrow(absent.aa.by.id.gene)))
+        if(nrow(mutations.by.id.gene) == 0){
+                next
+        }
 
-	print("---------------- plot ----------------")
+        mutations.at.position = colSums(mutations.by.id.gene[,-c(1,2)])
+        aa.at.position = colSums(absent.aa.by.id.gene[,-c(1,2,3,4)])
+
+        dat_freq = mutations.at.position / aa.at.position
+        dat_freq[is.na(dat_freq)] = 0
+        dat_dt = data.frame(i=1:length(dat_freq), freq=dat_freq)
+
+        print("---------------- plot ----------------")
 
-	m = ggplot(dat_dt, aes(x=i, y=freq)) + theme(axis.text.x = element_text(angle = 90, hjust = 1))
-	m = m + geom_bar(stat="identity", colour = "black", fill = "darkgrey", alpha=0.8) + scale_x_continuous(breaks=1:length(dat_freq), labels=1:length(dat_freq))
-	m = m + annotate("segment", x = 0.5, y = -0.05, xend=26.5, yend=-0.05, colour="darkgreen", size=1) + annotate("text", x = 13, y = -0.1, label="FR1")
-	m = m + annotate("segment", x = 26.5, y = -0.07, xend=38.5, yend=-0.07, colour="darkblue", size=1) + annotate("text", x = 32.5, y = -0.15, label="CDR1")
-	m = m + annotate("segment", x = 38.5, y = -0.05, xend=55.5, yend=-0.05, colour="darkgreen", size=1) + annotate("text", x = 47, y = -0.1, label="FR2")
-	m = m + annotate("segment", x = 55.5, y = -0.07, xend=65.5, yend=-0.07, colour="darkblue", size=1) + annotate("text", x = 60.5, y = -0.15, label="CDR2")
-	m = m + annotate("segment", x = 65.5, y = -0.05, xend=104.5, yend=-0.05, colour="darkgreen", size=1) + annotate("text", x = 85, y = -0.1, label="FR3")
-	m = m + expand_limits(y=c(-0.1,1)) + xlab("AA position") + ylab("Frequency") + ggtitle(paste(gene, "AA mutation frequency"))
+        m = ggplot(dat_dt, aes(x=i, y=freq)) + theme(axis.text.x = element_text(angle = 90, hjust = 1))
+        m = m + geom_bar(stat="identity", colour = "black", fill = "darkgrey", alpha=0.8) + scale_x_continuous(breaks=dat_dt$i, labels=dat_dt$i)
+        m = m + annotate("segment", x = 0.5, y = -0.05, xend=26.5, yend=-0.05, colour="darkgreen", size=1) + annotate("text", x = 13, y = -0.1, label="FR1")
+        m = m + annotate("segment", x = 26.5, y = -0.07, xend=38.5, yend=-0.07, colour="darkblue", size=1) + annotate("text", x = 32.5, y = -0.15, label="CDR1")
+        m = m + annotate("segment", x = 38.5, y = -0.05, xend=55.5, yend=-0.05, colour="darkgreen", size=1) + annotate("text", x = 47, y = -0.1, label="FR2")
+        m = m + annotate("segment", x = 55.5, y = -0.07, xend=65.5, yend=-0.07, colour="darkblue", size=1) + annotate("text", x = 60.5, y = -0.15, label="CDR2")
+        m = m + annotate("segment", x = 65.5, y = -0.05, xend=104.5, yend=-0.05, colour="darkgreen", size=1) + annotate("text", x = 85, y = -0.1, label="FR3")
+        m = m + expand_limits(y=c(-0.1,1)) + xlab("AA position") + ylab("Frequency") + ggtitle(paste(gene, "AA mutation frequency"))
+
+        print("---------------- write/print ----------------")
 
-	print("---------------- write/print ----------------")
-	
-	png(filename=paste(outdir, "/aa_histogram_", gene, ".png", sep=""), width=1280, height=720)
-	print(m)
-	dev.off()
-	
-	dat.sums = data.frame(index=1:length(mutations.at.position), mutations.at.position=mutations.at.position, aa.at.position=aa.at.position)	
-	
-	write.table(dat.sums, paste(outdir, "/aa_histogram_sum_", gene, ".txt", sep=""), sep="\t",quote=F,row.names=F,col.names=T)
-	write.table(mutations.by.id.gene, paste(outdir, "/aa_histogram_count_", gene, ".txt", sep=""), sep="\t",quote=F,row.names=F,col.names=T)
-	write.table(absent.aa.by.id.gene, paste(outdir, "/aa_histogram_absent_", gene, ".txt", sep=""), sep="\t",quote=F,row.names=F,col.names=T)
-	write.table(dat_dt, paste(outdir, "/aa_histogram_", gene, ".txt", sep=""), sep="\t",quote=F,row.names=F,col.names=T)
+        png(filename=paste(outdir, "/aa_histogram_", gene, ".png", sep=""), width=1280, height=720)
+        print(m)
+        dev.off()
+
+        dat.sums = data.frame(index=1:length(mutations.at.position), mutations.at.position=mutations.at.position, aa.at.position=aa.at.position)
+
+        write.table(dat.sums, paste(outdir, "/aa_histogram_sum_", gene, ".txt", sep=""), sep="\t",quote=F,row.names=F,col.names=T)
+        write.table(mutations.by.id.gene, paste(outdir, "/aa_histogram_count_", gene, ".txt", sep=""), sep="\t",quote=F,row.names=F,col.names=T)
+        write.table(absent.aa.by.id.gene, paste(outdir, "/aa_histogram_absent_", gene, ".txt", sep=""), sep="\t",quote=F,row.names=F,col.names=T)
+        write.table(dat_dt, paste(outdir, "/aa_histogram_", gene, ".txt", sep=""), sep="\t",quote=F,row.names=F,col.names=T)
 }