# Add an axis to a plot with R software

The goal of this article is to show you how to add **axis** to a plot using **R software**. For this end, we’ll use the **R axis()** function. A simplified format of this function is :

`axis(side, at=NULL, labels=TRUE)`

**side**: an integer indicating which side of the plot the axis is to be drawn on; Possible values are :**1**: below**2**: left**3**: above**4**: right

**at**: The points at which tick-marks are to be drawn.**labels**: Texts for tick-mark labels. It can also be logical specifying whether annotations are to be made at the tick-marks.

Example :

```
x<-1:4; y=x*x
# Example 1
plot(x, y, axes = FALSE)
axis(side=1, at = 1:4, labels=LETTERS[1:4])
axis(2)
# Example 2
plot(x, y, axes = FALSE)
axis(side=1, at=1:4, labels=LETTERS[1:4])
axis(2)
box() #- To make it look like "usual" plot
```

Another example is :

```
plot(x, y, pch=18, col="red", type="b",
frame=FALSE, xaxt="n") # Remove x axis
axis(1, 1:4, LETTERS[1:4], col.axis="blue")
axis(3, col = "darkgreen", lty = 2, lwd = 0.5)
axis(4, col = "violet", col.axis = "dark violet", lwd = 2)
```

Note that lty and lwd specify line-type and line-width, respectively.

**Infos**

This analysis has been performed using **R statistical software** (ver. 3.1.0).

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