我必须绘制一些基因表达值的热图。换句话说,热图的每一行代表10个基因的平均值,以便:
mean_genes[1:10]
,mean_genes[11:20]
,mean_genes[21:30]
。 到目前为止,一切正常,因为我知道功能热图。但是,在热图上,我必须逐行绘制1个基因表达值的分布(用一条线):
gene_expression[1]
,gene_expression[11]
,gene_expression[31]
。等等,因为最后我想逐行检查10个基因的组的表达值以及感兴趣的基因的表达值以进行比较(通过眼睛)。但是我完全不知道如何制作这样复杂的情节。
有关它的任何建议吗?
答案 0 :(得分:1)
在没有示例数据的情况下确定你所追求的是有点困难,但也许使用ggplot2和geom_tile()的情节如下(道歉它没有被打扮,但你可以摆弄它):
## LIBRARY (must be installed)
require(ggplot2)
require(plyr)
## CREATE THE GENEMAP DATA
geneMap<-data.frame(1:100,expand.grid(1:10,1:10),rnorm(100,6,2))
colnames(geneMap)<-c("ID","X","Y","expr")
## APPEND THE ROWMEANS TO EACH ITEM
rowMean<-ddply(geneMap, "X" ,function(df)mean(df$expr))
geneMap<-merge(geneMap,rowMean,by="X")
colnames(geneMap)<-c("X","ID","Y","expr","rMean")
## CREATE A BASIC TILE WITH FILLED ROWS (FILL BY MEAN, ALPHA BY VALUE)
hmap<-ggplot(data=geneMap, aes(x=X,y=Y)) + # Basic Plot
theme_bw() + # Basic Theme
geom_tile(aes(fill=rMean)) + # Fill the tile by mean
scale_x_continuous( breaks = 1:10,1) + # Force ticks 1-10 on x axis
scale_y_continuous( breaks = 1:10,1) + # Force ticks 1-10 ony axis
scale_fill_gradient(low="yellow", high="orange") # Color the heatmap
hmap <- hmap + annotate("text", x = geneMap$X, y = geneMap$Y,
label = round(geneMap$expr,2)) # Label each point with value
meanSummary<-unique(geneMap[,c("X","rMean")]) # Pull out the means for each row
origSummary<-geneMap[geneMap$Y==1,] # Pull out the original "seed" vals for each row
hmap<- hmap + annotate("text", x = meanSummary$X,
y = max(geneMap$Y)+1,
label = round(meanSummary$rMean,2)) # Add the mean labels at row end
hmap<- hmap + annotate("text", x = min(geneMap$Y)-1,
y = max(geneMap$Y)+1, label = "MEANS") # Label the row
hmap<- hmap + geom_line(aes(x=origSummary$X,
y=origSummary$expr*(max(origSummary$X)/max(origSummary$expr)),
size=3, alpha=0.6)) # Add the line plot
# Draw the map & flip is so the rows run horizontally (or not!)
hmap + coord_flip()