---
title: "Data Types"
output: html_notebook
---

If you guessed that the last command will return an error because 77.2 plus "Denmark" is nonsense, you’re right - and you already have some intuition for an important concept in programming called data classes. We can ask what class of data something is:

```{r}
# class(nordic$lifeExp)

```

Define two numeric variables, xLongitude and yLatitude (These are coordinates for Albuquerque, New Mexico)

```{r echo=TRUE}
xLongitude <- 106.67
yLatitude <- 35.07
class(xLongitude)
```

Use the 'plot' function from the R base package to see the coordinates displayed on a simple plot

```{r}

plot(xLongitude,yLatitude)  
```

Next, import the 'maps' package, and use the library command to initialize it

```{r}
install.packages("maps")
library(maps)
```

Instead of plotting on a simple background, plot on a world map

```{r}
map("usa")
points(x,y, col="gray") 
```

The 'maps' package has a rough outline of the United States included, and we now should have a plot of a US map with Albuquerque indicated by a gray circle