我正在运行以下代码,但由于某种原因,在循环charts.PerformanceSummary()
内使用时for
,它会尝试产生比通过循环的次数更多的输出。而一个简单的绘图功能似乎工作正常......
请参阅下面的 .Rmd 代码,然后是编织到 html 后创建的后续 .md 文件...
PLOT TEST
====
```{r}
suppressPackageStartupMessages(require(PerformanceAnalytics))
for(i in 1:5){
charts.PerformanceSummary(xts(rnorm(i*1000,0.0001,0.0003),Sys.Date()-c((i*1000):1)))
}
```
```{r}
for(i in 1:5){
plot(xts(cumprod(rnorm(i*1000,0.0001,0.0003)+1),Sys.Date()-c((i*1000):1)))
}
```
给出以下 .md 文件
PLOT TEST
====
```r
suppressPackageStartupMessages(require(PerformanceAnalytics))
for (i in 1:5) {
charts.PerformanceSummary(xts(rnorm(i * 1000, 1e-04, 3e-04), Sys.Date() -
c((i * 1000):1)))
}
```
     
```r
for (i in 1:5) {
plot(xts(cumprod(rnorm(i * 1000, 1e-04, 3e-04) + 1), Sys.Date() - c((i *
1000):1)))
}
```
    
请注意第一个块如何尝试连接到 6 个输出图,但第二个块中只有 5 个输出图,尽管它们具有相同for (i in 1:5) {
的代码位......
作为附加信息,以下是sessionInfo
sessionInfo()
## R version 3.0.0 (2013-04-03)
## Platform: x86_64-apple-darwin10.8.0 (64-bit)
##
## locale:
## [1] en_GB.UTF-8/en_GB.UTF-8/en_GB.UTF-8/C/en_GB.UTF-8/en_GB.UTF-8
##
## attached base packages:
## [1] stats graphics grDevices utils datasets methods base
##
## other attached packages:
## [1] PerformanceAnalytics_1.1.0 xts_0.9-3
## [3] zoo_1.7-9 knitr_1.2
##
## loaded via a namespace (and not attached):
## [1] digest_0.6.3 evaluate_0.4.3 formatR_0.7 grid_3.0.0
## [5] lattice_0.20-15 stringr_0.6.2 tools_3.0.0
编辑
我也只是自己运行了一行,并有一个半修复......但不是一个用于在同一个块中制作多个图表的......
下面是 .Rmd 脚本和 .md 输出
```{r}
charts.PerformanceSummary(xts(rnorm(1000,0.0001,0.0003),Sys.Date()-c((1000):1)))
```
```{r fig.keep='last'}
charts.PerformanceSummary(xts(rnorm(1000,0.0001,0.0003),Sys.Date()-c((1000):1)))
```
.md 输出
```r
charts.PerformanceSummary(xts(rnorm(1000, 1e-04, 3e-04), Sys.Date() - c((1000):1)))
```
 
```r
charts.PerformanceSummary(xts(rnorm(1000, 1e-04, 3e-04), Sys.Date() - c((1000):1)))
```

编辑 2
正如@agstudy 所指出的,看起来 knitr 正在生成不必要的空白图像……有人知道如何删除它吗?