Error in unique default x nmax nmax unique applies only to vectors in R

Question

Hi. I'm new to R. Can anyone tell what does this mean?

Error in unique.default(x, nmax = nmax) : unique() applies only to vectors in R

Answer 1

This error is displayed if you used a list instead of a vector for a unique function.

Use c() function instead of list() if you are creating new r object and try again.