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# How to Solve R Error: Incorrect number of dimensions

by | Programming, R, Tips

This error occurs when you try to subset an object outside its number of dimensions. We can get the number of dimensions of an object using the `dim()` function. We can then solve the error by ensuring we only subset using the available dimensions.

This tutorial will go through the error in detail with code examples.

## Example

Let’s look at an example to reproduce the error. First, we will define a numeric vector with 8 values:

`x<-c(1, 7, 10, 13, 22, 25, 14, 19)`

Next, we will try to access the first row and the second column using the subset operator.

`x[ , 2]`

Let’s run the code to see what happens:

`Error in x[, 2] : incorrect number of dimensions`

The error occurs because we are attempting to subset using two dimensions. We can check the dimensions of an object using the `dim()` function. For example,

`dim(x)`
`NULL`

The dim() function returns null because a vector has a length but not other dimensions.

### Solution

We can solve the error by subsetting with one dimension. Let’s look at how to access the fifth element in the vector:

`x[5]`
`[1] 22`

Using a colon, we can access several values in the vector, also called a slice. Let’s look at how to access the elements at index 2 through to 5.

`x[2:5]`
`[1]  7 10 13 22`

## Summary

Congratulations on reading to the end of this tutorial!

For further reading on R-related errors, go to the articles:

Go to the online courses page on R to learn more about coding in R for data science and machine learning.

Have fun and happy researching!