How to plot scattermatrix in R?
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# How to plot scattermatrix in R?

This recipe helps you plot scattermatrix in R

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## Recipe Objective

A scatter matrix or a scatter plot matrix is a grid which consists of NxN scatter plot. A scattermatrix is mainly used to display the bivariate relationships among all the pairs of variables in the dataset through scatterplots. This allows us to explore all the relationships between pairs in a single graph. ​

Minimum three numeric variables are needed to plot a scatter matrix. The layout of the matrix consists of a upper right half and left lower half cut across a diagonal. ​

This recipe demonstrates how to plot a scattermatrix in R. ​

Dataset description: It is the basic data about the customers going to the supermarket mall. The variables that we are interested in: Annual.Income (which is in 1000s) , Spending Score and Age

``` # Data manipulation package library(dplyr) library(tidyverse) # reading a dataset customer_seg = read.csv('R_121_Mall_Customers.csv') # selecting the required variables using the select() function customer_seg_var = select(customer_seg, Age, Annual.Income..k..,Spending.Score..1.100.) # summary of the selected variables glimpse(customer_seg_var) ```
```Observations: 200
Variables: 3
\$ Age                     19, 21, 20, 23, 31, 22, 35, 23, 64, 30, 67, 35…
\$ Annual.Income..k..      15, 15, 16, 16, 17, 17, 18, 18, 19, 19, 19, 19…
\$ Spending.Score..1.100.  39, 81, 6, 77, 40, 76, 6, 94, 3, 72, 14, 99, 1…
```
STEP 2: Plotting a scatter matrix

We use pairs() function to plot a scatter matrix.

Syntax: pairs(x, col = , pch = , labels = , main = )

Where:

1. x = dataframe
2. col = used to change the colour of the points
3. pch = used to change the shape of the points
4. labels = used to change the labels of the diagnol
5. main = used to give a title to the graph
``` pairs(customer_seg_var, col = "green", pch = 19, labels = c("Age", "Annual Income", "Spending Score"), main = "Scatter Matrix") ```

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