How to add create a box plot with categorical columns?

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How to add create a box plot with categorical columns? Hi, i want to plot a box plot to show sales over category. But i am getting below error.

Is there a way to show box plot for categorical variables(fields)? 

Jul 3 in Data Analytics by nikita
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1 answer to this question.

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One way is to convert to factor and use it as integer vs the other categorical column.

Use code like below -

boxplot(as.integer(as.factor(read_data$Class))~read_data$Age,ylab = "Class",xlab = "Age")
answered Jul 4 by anonymous
• 25,900 points

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