r 作图一页多图时 总标题用哪个函数?

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r 作图时，main可以对每个小图设定标题，但一页多图时，需要有个总标题，这个怎么办呢？大家肯定都遇到过，小菜鸟一只，求指教，谢谢!

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关键词：Main 怎么办 MAI 求指教

try "mtext"?

zhangyangsmith 发表于 2013-12-10 17:11
try "mtext"?

好，我试一下，谢谢。

zhangyangsmith 发表于 2013-12-10 17:11
try "mtext"?

貌似不行，或者是我不会设置吧，还有别的方法吗？

mengye02 发表于 2013-12-10 17:29
貌似不行，或者是我不会设置吧，还有别的方法吗？

Well, it does require a bit more setting. You will have to change the "oma" option using the "par" function. In addition, for "mtext" you need to specify "outer = T". It should work. Here is an example:

1. par(mfrow = c(2, 2), oma = c(0, 0, 3, 0))
   
2. plot(qnorm, main = expression(Phi^{-1}))
   
3. plot(qlogis, main = "The Inverse Logit : qlogis()")
   
4. abline(h = 0, v = 0:2/2, lty = 3, col = "gray")
   
5. curve(sin, -2*pi, 2*pi, xname = "t", main = "curve(sin)")
   
6. curve(tan, xname = "t", add = NA, main = "curve(tan)")
   
7. mtext("Plots of Different Functions", side = 3, line = 0, outer = T)

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There are other ways to do multiplot on one device (e.g., layout, split.screen) but I haven't found other means of adding a title to the whole page...

zhangyangsmith 发表于 2013-12-10 18:07
Well, it does require a bit more setting. You will have to change the "oma" option using the "par" ...

thank you so much! yes, it now works!

mengye02 发表于 2013-12-10 19:54
thank you so much! yes, it now works!

我运行了一下楼上的代码，没发现总标题啊？楼主知道怎么做了吗，分享一下lou。

skytreee 发表于 2013-12-11 10:08
我运行了一下楼上的代码，没发现总标题啊？楼主知道怎么做了吗，分享一下lou。

我运行了是可以的。你在检查一下，par函数里的oma的设置很重要

zhangyangsmith 发表于 2013-12-10 18:07
Well, it does require a bit more setting. You will have to change the "oma" option using the "par" ...

高手，请教个问题吧?
x<-list()
为什么 is.null(x)
结果为FALSE？

这是为什么？本来想用is.null 作为剔除空list的依据呢 结果是FALSE ，这下该怎么办呢？

mengye02 发表于 2013-12-12 14:04
高手，请教个问题吧?
x

Perhaps you want to test if the length of the list is 0:

1. x <- list()
   
2. length(x)
   
3. # [1] 0

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