plot - RStudio creates the graph, but Markdown will not -

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i'm running short snippet of code , can create graph in rstudio plot window, when run markdown, following error:

error in hist(p.rating): object 'p.rating' not found

here code i'm using:

{r loading data, include=false}  setwd("~/google drive/new leaders/data/knowngroups")  mydata <- read.csv("copy of gates study data download (052815_v2).csv")  attach(mydata)  colnames(mydata)[5] <- "p.rating"    {r fig.width=7, fig.height=6}  hist(p.rating)

thanks!

the histogram statement @ end has column name without data set. should help:

hist(mydata$p.rating)


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