獲取heatmap（）函數集羣特定成員的名稱R

Question

一旦在R中使用'heatmap（）'函數生成熱圖，是否有辦法專注於並提取特定集羣的成員？

我有一個4500×420熱成員的地圖，它會很有用。

謝謝。

Answer 1

指定keep.dendro = TRUE，您應該有數據在Rowv和Colv的列表元素下。

這是一個從?heatmap稍作修改的例子。

require(graphics); require(grDevices) 
x <- as.matrix(mtcars) 
rc <- rainbow(nrow(x), start = 0, end = .3) 
cc <- rainbow(ncol(x), start = 0, end = .3) 
hv <- heatmap(x, col = cm.colors(256), scale = "column", 
       RowSideColors = rc, ColSideColors = cc, margins = c(5,10), 
       xlab = "specification variables", ylab = "Car Models", 
       main = "heatmap(<Mtcars data>, ..., scale = \"column\")", 
       keep.dendro = TRUE) 

hv$Rowv 
'dendrogram' with 2 branches and 32 members total, at height 425.3447 

編輯

如果你想組成員，您需要先砍倒。

cutree(as.hclust(hv$Rowv), h = 200) 

      Mazda RX4  Mazda RX4 Wag   Datsun 710  Hornet 4 Drive Hornet Sportabout    Valiant 
        1     1     1     2     3     2 
     Duster 360   Merc 240D   Merc 230   Merc 280   Merc 280C   Merc 450SE 
        3     1     1     1     1     2 
     Merc 450SL   Merc 450SLC Cadillac Fleetwood Lincoln Continental Chrysler Imperial   Fiat 128 
        2     2     3     3     3     1 
     Honda Civic  Toyota Corolla  Toyota Corona Dodge Challenger   AMC Javelin   Camaro Z28 
        1     1     1     2     2     3 
    Pontiac Firebird   Fiat X1-9  Porsche 914-2  Lotus Europa  Ford Pantera L  Ferrari Dino 
        3     1     1     1     3     1 
     Maserati Bora   Volvo 142E 
        4     1