Ggplots are not displayed after knitring to html/word/etc.

[mimler]

Hi everyone,

first up, it is my first coding assignment and I am already desperate. I downloaded the latest version of Rstudio for Mac 3 days ago and I am now trying to submit an assignment in word format that displays graphs about life expectancies. When I run the code in Rstudio, the plot is shown correctly. However, once I knitr it to html or other formats, it only shows the code, not the graphs. Below, you can see what I did.

---
title: "assignment"
author: "mimler"
date: "23.07.2019"
output:
  html_document:
    highlight: zenburn
    theme: flatly
    toc: yes
    toc_float: yes
  pdf_document:
    toc: yes
  word_document:
    toc: yes
---


```{r load-libraries, warning=FALSE, message=FALSE, echo=FALSE}
library(tidyverse)  # Load ggplot2, dplyr, and all the other tidyverse packages
library(gapminder)  # gapminder dataset
library(dplyr)
library(ggplot2)
```

```{r}
country_data <- gapminder %>% 
            filter(country == "Germany") # I come from Germany.

continent_data <- gapminder %>% 
            filter(continent == "Europe")
```

```{r, lifeExp_one_country}
plot1 <- ggplot(country_data,aes(x = year, y = lifeExp))+
   geom_point() +
   geom_smooth(se = FALSE) +

print(plot1)
```

This is just copied out of my Rstudio session. Most of it was already given and I just had to put in the aesthetics etc. I tried to find an answer online, and sometimes I thought I found the correct thread, but then technical terms made it impossible for me to understand, as I started R just 3 days ago. So, I would be very greatful for an easy explanation. If you require any further information, I will try to provide it.
Thanks.

[pieterjanvc]

Hi,

The forum's homework policy encourages us to not simply give you fixed code, but help you get there yourself:

FAQ: Homework Policy

Can I ask questions from a course I am taking here? General questions are always welcome! Please do ask general questions about things like: How to use R How to use the RStudio IDE or RStudio Cloud How to work with tidyverse packages Where to find resources to help you learn or solve problems Specific questions can be OK, if you follow these rules: Never copy-paste instructions from an assignment (even for online courses). Explicitly mention the course you are taking and use the #homework tag. Ask your question as a reproducible example (reprex), preferably prepared for posting using the reprex package. Want to maximize your chances of getting the help you need? Keep readin…

In your case, I'd first see if this is an issues with RMarkdown in general, or with your code. If you create a new markdown and use the default sample that's given, can you generate the plots once you knit it? If not, there's an issue with R-studio/R, if you can, it's your code.

In your code, look at the plot1 line. If you run it as you put it above, I get an error:

Error: Don't know how to add print(plot1) to a plot

The error message pretty much gives you the fix for the issue, but I doubt this was your original issue as you wouldn't have been able to plot it locally in R with that error either. If I fix it, my R-markdown works.

One last tip: Click on the options button on the top right of your code chunk to check if you are rendering both code and output

PJ