将Y轴放在热图的左侧? [英] Put the Y axis on the left of a heatmap?

问题描述

如何使用左侧的Y轴标签制作热图?它似乎默认为右侧.我是否需要使用 axis()创建自定义轴?

How do I make a heatmap with the Y axis labels on the left? It seems to default to the right. Do I need to make a custom axis using axis()?

推荐答案

在 heatmap 函数中，轴的位置是硬编码的.但是，仅更改一个数字以使其位于另一侧将非常容易.在控制台上键入"heatmap"，然后在第二个 axis()调用中将第一个参数从4更改为2.

In the heatmap function the positions of the axes are hard-coded. But it would be very easy to change just a single number to get it positioned on the other side. Type "heatmap" at your console and change the first argument from a 4 to a 2 in the second axis() call.

我所做的只是:

axis(2, iy, labels = labRow, las = 2, line = -0.5, tick = 0,  # the 2 used to be 4
         cex.axis = cexRow)

仍然需要更改边距以适应开关.在我从帮助页面开始处理的示例中，将当前值从0更改为5似乎可以创建足够的空间:

There still need to be changes in the margins to accommodate the switch. Changing the current value of 0 to 5 seemed to create adequate space in the example I was playing with from the help page:

...
par(mar = c(margins[1L], 5, 0, margins[2L]))

这是我的测试用例:

x  <- as.matrix(mtcars)
rc <- rainbow(nrow(x), start=0, end=.3)
cc <- rainbow(ncol(x), start=0, end=.3)
utils::str(hv) # the two re-ordering index vectors

## no  dendrogram (nor color strip)
heatmap.new(x, Colv = NA, Rowv=NA, col = cm.colors(256), scale="column",
        margins=c(5,2),
        xlab = "specification variables", ylab= "Car Models",
        main = "heatmap(<Mtcars data>, ..., scale = \"column\")")

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