Use anonymous functions for f (f = x -> x and f = x -> -x), see e.g. Defining a function inside if...else..end NOT as expected?. There is also an issue about this that I can’t find now.
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Use anonymous functions for f (f = x -> x and f = x -> -x), see e.g. Defining a function inside if...else..end NOT as expected?. There is also an issue about this that I can’t find now.