GAabbreviate function issue

No matter what inputs I use, it seems to give this output

Iter = 94 | Mean = 1.048428 | Best = 1.047688
Iter = 95 | Mean = 1.048798 | Best = 1.047688
Iter = 96 | Mean = 1.049274 | Best = 1.047688
Iter = 97 | Mean = 1.048428 | Best = 1.047688
Iter = 98 | Mean = 1.048899 | Best = 1.047688
Iter = 99 | Mean = 1.048428 | Best = 1.047688
Iter = 100 | Mean = 1.048058 | Best = 1.047688
Error in sign(list.i) : non-numeric argument to mathematical function

Is there something that I am doing wrong?

Thank you!

And what were you doing and with what. What were you expecting as output?

We need to see your original code and some sample data. See

or

is all there is to go on. @jrkrideau is right—that's notmuch.

The error message is complaining that the sign function is expecting a numeric vector and the list.i argument isn't one.

How that came to be is invisible with what can be seen in the OP.

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