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How to add Axes to Plot in R, In the world of data visualization, creating visually appealing and informative plots is crucial for effectively communicating insights.

The R programming language offers a plethora of tools to customize your plots, including the ability to add user-defined axis ticks using the axis() function.

In this article, we will walk you through three examples that demonstrate how to create plots with custom axis ticks in R.

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Example 1: Draw Plot with Default Axis Ticks

Before diving into custom axis ticks, let’s first learn how to draw a basic plot with default axis specifications.

The plot() function in R can be used to create a scatterplot, as shown in the code snippet below:

plot(1:200)           # Default plot

This code will generate a scatterplot with default axis values.

Example 2: Plot with Specified Axis Ticks

Now, let’s move on to adding user-defined axis labels using the axis() function. First, we need to create a graph without any axis values:

plot(1:200,           # Plot without axes
     xaxt = "n",
     yaxt = "n")

Once the plot is created without axes, we can use the axis() function to add axis values.

The side parameter is used to specify which axis to modify, with 1 representing the x-axis and 2 representing the y-axis.

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The c() function is used to define the tick values for the respective axis:

axis(side = 1,        # Draw x-axis
     c(0, 50, 100, 150, 200)) #Just an example
axis(side = 2,        # Draw y-axis
     c(10, 50, 150)) #Just an example

Example 3: Plot with Axis Mark on Top & Right Side

In some cases, you may want to add axis ticks on the top and right side of the plot.

This can be achieved using the same R code as in the previous example, but with different values for the side parameter.

Instead of 1 and 2, we will use 3 and 4 to represent the top and right axes, respectively:

plot(1:200,           # Plot without axes
     xaxt = "n",
     yaxt = "n")
axis(side = 3,        # Add axis on top
     c(0, 50, 100, 200)) #Just an example
axis(side = 4,        # Add axis on right side
     c(0, 50, 110)) #Just an example

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