我正在尝试使用csv NFL_DATA.csv创建一个R markdown。但是，当我尝试使用knitr时，我收到错误：
nrow中的错误（NFL_DATA）：对象＆＃39; NFL_DATA＆＃39;未找到电话： ... in_dir - ＆gt; inline_exec - ＆gt; withVisible - ＆gt; eval - ＆gt; eval - ＆gt; nrow执行暂停
这是我的代码的开头：
title: "XXXXXX"
author: "XXXXXX"
date: "December 11, 2017"
output: html_document
font-family: "Arial"
---
```{r setup, include=FALSE}
knitr::opts_chunk$set(echo = TRUE)
```
---
## Introduction
XXXXXXXXXXXXX.
---
## Data
We used the site data.world.com to find my data. The dataset can be retrieved at [NFL_DATA.csv](https://data.world/alice-c/nfl-fines-and-suspensions/workspace/file?filename=All+Penalties.csv).
There are `r nrow(NFL_DATA)` observations in the NFL data set and `r length(NFL_DATA)` variables. The variables are:
```{r echo=FALSE, comment=""}
names(NFL_DATA)
```
当我运行它时，knitr不起作用并给出错误消息。但是，当我只运行names(NFL_DATA)的最后一段代码时，它确实有效，并显示所有变量名称。我该如何解决这个问题？
答案 0 :(得分：0)
在编辑代码后尝试此操作指向本地存储csv文件的位置。
---
title: "NFL Fines and Suspensions Analysis"
author: "anAuthor"
date: "12/8/2017"
output: html_document
---
```{r setup, include=FALSE}
knitr::opts_chunk$set(echo = TRUE)
```
## Read Data
Here is example code to read the nfl data
```{r readData,echo=FALSE}
nfldata <- read.csv("./data/All Penalties.csv",header=TRUE)
```
There are `r nrow(nfldata)` observations in the NFL data set and `r length(nfldata)` variables. The variables are:
```{r}
names(nfldata)
```