I am traying to calculate daily ET0 using penman montain equation in R package Evapotraspiration. according to the package documentation, the script shoul be as follws
results
For a problem like yours I found the response below
$ is only valid for recursive objects. Therefore you get an error when applying $ to a vector (non-recursive object), use [ instead
Please see https://stackoverflow.com/questions/23299684/r-error-in-xed-operator-is-invalid-for-atomic-vectors
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