Karthik :
I am trying to generate multiple plots (in ggplot2) using a for loop within a single chunk in an RMarkdown document.
When I hardcode the code to generate the two plots, the plots are rendered as expected. See section in my code titled "Hardcoded Method".
But, when I load the parameters for the two plots in a list and loop through the list, the plots are not showing up. I don't see any errors either. Please see section of my code titled "Loop Method".
Can anyone please tell me what is going on and how I can fix it? Thanks.
- Karthik.
Here is my code:
---
title: "Test for multiple plots"
author: "KC"
date: "4/3/2020"
output: html_document
---
```{r setup, include=FALSE}
knitr::opts_chunk$set(echo = TRUE)
```
# Hardcoded Method
Sample Plot - One plot at a time
```{r Multiple Plots separately listed, echo=TRUE, fig.keep="all"}
library(ggplot2)
library(datasets)
combo = c("temperature", "pressure")
ggplot(pressure,
mapping=aes(x=base::get(combo[1]), y=base::get(combo[2]))) +
geom_point() +
labs(x=combo[1],
y=combo[2],
title=paste("Hardcoded Method:", paste(combo, collapse=" vs ")))
combo = c("pressure", "temperature")
ggplot(pressure,
mapping=aes(x=base::get(combo[1]), y=base::get(combo[2]))) +
geom_point() +
labs(x=combo[1],
y=combo[2],
title=paste("Hardcoded Method:", paste(combo, collapse=" vs ")))
```
# Loop Method
Now, I use a loop method to generate the same plots.
```{r Multiple Plots in a loop, echo=TRUE, fig.keep="all"}
library(ggplot2)
library(datasets)
combos = list(c("temperature", "pressure"), c("pressure", "temperature"))
for (combo in combos) {
# combo = combos[[1]]
print(paste("Plotting", paste(combo, collapse=" vs ")))
ggplot(pressure,
mapping=aes(x=base::get(combo[1]), y=base::get(combo[2]))) +
geom_point() +
labs(x=combo[1],
y=combo[2],
title=paste("Loop Method:", paste(combo, collapse=" vs ")))
}
```
chemdork123 :
When using a for loop in a code chunk with Markdown files, you need to explicitly print() the plot. So, the following code would not work:
for (i in length(x)) {
ggplot(...)
}
You need to convert to something like this:
for (i in length(x)) {
p <- ggplot(...)
print(p)
}
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