我想用ggplot2从向量绘制直方图。数据集来自datasets包中的rivers。
我阅读了 ggplot 的帮助文档,有以下问题:
rivers
[1] 735 320 325 392 524 450 1459 135 465 600 330 336 280 315 870 906 202 329
[19] 290 1000 600 505 1450 840 1243 890 350 407 286 280 525 720 390 250 327 230
[37] 265 850 210 630 260 230 360 730 600 306 390 420 291 710 340 217 281 352
[55] 259 250 470 680 570 350 300 560 900 625 332 2348 1171 3710 2315 2533 780 280
[73] 410 460 260 255 431 350 760 618 338 981 1306 500 696 605 250 411 1054 735
[91] 233 435 490 310 460 383 375 1270 545 445 1885 380 300 380 377 425 276 210
[109] 800 420 350 360 538 1100 1205 314 237 610 360 540 1038 424 310 300 444 301
[127] 268 620 215 652 900 525 246 360 529 500 720 270 430 671 1770
一开始我尝试了这些方法,但是都没有起作用:
> ggplot(rivers,aes(rivers))+geom_histogram()
Error: ggplot2 doesn't know how to deal with data of class numeric
> ggplot(rivers)+geom_histogram(aes(rivers))
Error: ggplot2 doesn't know how to deal with data of class numeric
后来我发现了一个类似的问题,然后我找到了解决办法:
ggplot()+aes(rivers)+geom_histogram()
or
ggplot()+geom_histogram(aes(rivers))
我阅读了 ggplot 的帮助文档,有以下问题:
- why i got error when i claim dataset in either ggplot() or geom_histogram(),like ggplot(data=rivers)? Help docs indicates a vector will be coerced to a data frame by default and a dataset must be specified. My assumption is that when a dataset is not specified, the function will search for global environment?
- why it works when i call aes(rivers) independently or in geom_histogram() but i got error when i put it in gglot(). why the location of aes(rivers) matters in this case?
ggplot(aes(rivers))+geom_histogram() Error: ggplot2 doesn't know how to deal with data of class uneval
vector
。将其转换为data.frame
,然后使用ggplot
。 - akrun