Test for fig.ncol

fig.ncol_test.Rmd

---
title: "Untitled"
author: "Elio"
output: 
   pdf_document:
      keep_tex: yes
      fig_caption: yes
header-includes: 
    - \usepackage{subfig}
---

Some tests:

```{r setup, include=FALSE}
knitr::opts_chunk$set(echo = TRUE)
```

Intended use:

```{r pressure, out.extra = "", echo = FALSE, fig.show = "hold", fig.cap = "Pressure", fig.subcap = c("one","two", "tree"), fig.ncol = 2, out.width = "0.48\\textwidth"}
plot(pressure)
ggplot2::qplot(temperature, pressure, data = pressure)
plot(pressure)
```

Previous behaviour:

```{r pressure1, out.extra = "", echo = FALSE, fig.show = "hold", fig.cap = "Pressure", fig.subcap = c("one","two", "tree"), out.width = "0.48\\textwidth"}
plot(pressure)
ggplot2::qplot(temperature, pressure, data = pressure)
plot(pressure)
```

Previous behaviour again:

```{r pressure5, out.extra = "", echo = FALSE, fig.show = "hold", fig.cap = "Pressure", fig.subcap = c("one","two", "tree"), fig.ncol = 3, out.width = "0.48\\textwidth"}
plot(pressure)
ggplot2::qplot(temperature, pressure, data = pressure)
plot(pressure)
```

Centering works... interestingly:

```{r pressure3, out.extra = "", echo = FALSE, fig.show = "hold", fig.cap = "Pressure", fig.subcap = c("one","two", "tree"), fig.ncol = 2, out.width = "0.48\\textwidth", fig.align='center'}
plot(pressure)
ggplot2::qplot(temperature, pressure, data = pressure)
plot(pressure)
```

Some stress testing:

One plot

```{r pressure4, out.extra = "", echo = FALSE, fig.show = "hold", fig.cap = "Pressure", fig.subcap = c("one","two", "tree"), fig.ncol = 2, out.width = "0.48\\textwidth", fig.align='center'}
plot(pressure)
```

Negative

```{r pressure10, out.extra = "", echo = FALSE, fig.show = "hold", fig.cap = "Pressure", fig.subcap = c("one","two", "tree"), fig.ncol = -1, out.width = "0.48\\textwidth", fig.align='center'}
plot(pressure)
```

No fig.show
```{r pressure11, out.extra = "", echo = FALSE, fig.cap = "Pressure", fig.subcap = c("one","two", "tree"), fig.ncol = -1, out.width = "0.48\\textwidth", fig.align='center'}
plot(pressure)
```