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 Question: R mutate produces error ‘Must be size 1, not 10’
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R mutate produces error ‘Must be size 1, not 10’
The error message “Must be size 1, not 10” typically occurs when you are using the mutate
function in dplyr
package to create a new column, and the result of the operation is a vector with a length that is not equal to 1, but rather 10 in your case.
This error message is telling you that the output of the mutate
function should be a single value, but instead, it is returning 10 values.
Here are some possible causes and solutions:

Make sure that you are using a vectorized function in
mutate
. If you are using a function that returns a vector, such asstrsplit
,substr
, orseq
, you need to make sure that the length of the output is the same as the length of the input. If the lengths are not the same, you can try to useunnest
orflatten
functions fromtidyr
package to flatten the list column into individual values. 
Check if you are inadvertently using an operation that returns a vector instead of a single value. For example, if you are trying to assign a new value to a column using
=
instead of==
, you will get this error because=
returns a vector of the same length as the input column. 
Make sure that you are not accidentally referencing multiple columns in the
mutate
function. For example, if you usemutate(df, new_col = col1 + col2)
whencol1
andcol2
are both vectors with length 10, you will get this error message becausecol1 + col2
returns a vector of length 10. 
If you are still having trouble, try breaking down your
mutate
function into smaller steps and check the output at each step. This will help you identify where the error is occurring.
I hope this helps! If you can provide more information about your specific code, I can give more specific advice.
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