Error in angle_model$edd : $ operator not defined for this S4 class

Question

This seem to be a recurrent error message but solutions seem to be rather case specific for what I'm seeing (I'm starting with R so every step is difficult for me still). I'm following the script for a estimation of density with camera traps and after finding solutions for every problem on my own, I got to this last one just at the end, and I don't know hot to fix it. The part of the script I'm following is this:

Last section of the script

And I got stuck with param <- get_parameter_table(rad, ang, spd, act)

When I run it it says this:

Error in angle_model$edd : $ operator not defined for this S4 class

The same error occurs if I just run rad, spd or act alone.

When I ask RStudio to show Traceback it says this:

Traceback

What could I do to fix it?

Thanks in advance.

Answer 1

This error means that you cannot use the $ operator with the angle_model object. You will have to find some other way to access the parts of it. Check the package documentation for any way they have provided, but failing that you may be able to use the @ operator, which gets the slots (similar to attributes, but not quite the same) of the object.

Alternatively, you might be able to use the [ or [[ operators instead of $, e.g. angle_model[["edd"]].