Remove progress bar from knitr output

Question

I'm analyzing some data and would like to do a Simpsons paradox on R. I've installed the Simpsons package and loaded the library. Here is an example based on the package documentation:

---
output: html_document
---
```{r}
library(Simpsons)
#generating data 
Coffee1=rnorm(100,100,15)
Neuroticism1=(Coffee1*.8)+rnorm(100,15,8)
g1=cbind(Coffee1, Neuroticism1)
Coffee2=rnorm(100,170,15)
Neuroticism2=(300-(Coffee2*.8)+rnorm(100,15,8))
g2=cbind(Coffee2, Neuroticism2)
Coffee3=rnorm(100,140,15)
Neuroticism3=(200-(Coffee3*.8)+rnorm(100,15,8))
g3=cbind(Coffee3, Neuroticism3)
data2=data.frame(rbind(g1,g2,g3))
colnames(data2) <- c("Coffee","Neuroticism")

example <- Simpsons(Coffee,Neuroticism,data=data2) 
plot(example)
```

This is returning a plot with 3 clusters (exactly what I need). However, when I Knit the Rmd file to HTML, I'm getting a lot of equals signs (======) with a percentage next to it like a loading grid which I would like to remove from my final output.

Answer 1

You can suppress any output messages in R by setting the knitr chunk option. If we wish to hide all code output other than plots, we can use the following solution:

---
output: html_document
---

```{r echo=FALSE, results='hide', fig.keep='all', message = FALSE}
library(Simpsons)
#generating data 
Coffee1=rnorm(100,100,15)
Neuroticism1=(Coffee1*.8)+rnorm(100,15,8)
g1=cbind(Coffee1, Neuroticism1)
Coffee2=rnorm(100,170,15)
Neuroticism2=(300-(Coffee2*.8)+rnorm(100,15,8))
g2=cbind(Coffee2, Neuroticism2)
Coffee3=rnorm(100,140,15)
Neuroticism3=(200-(Coffee3*.8)+rnorm(100,15,8))
g3=cbind(Coffee3, Neuroticism3)
data2=data.frame(rbind(g1,g2,g3))
colnames(data2) <- c("Coffee","Neuroticism")

example <- Simpsons(Coffee,Neuroticism,data=data2) 
plot(example)
```

I would note that this package seems to print out a lot more content that most packages, and therefore the combination of options are quite long.

An easier method would probably be to move the plot to a separate chunk and have all the analysis run before it. The include argument can be used to suppress all outputs, but this includes plots, hence why we must use two chunks:

```{r, include = FALSE}
# your code to build model
```

```{r}
plot(example)
```

Check out the full list of knitr chunk options here