How to deal with NaN in large arrays using swift

Question

I am using the swift accelerate APIs to process some data. However a few of these data points contain NaN values (result of trying to divide a zero value).

My question is can I easily deal with this using any inbuilt swift function? I am looking at replacing all values of NaN with zero values so that I can still further process these large data sets without an error.

If your arrays are very large maybe it is best to handle those NaN elements ony by one as you process the data — Joakim Danielson, Dec 10 '19 at 13:56

Sweeper · Answer 1 · 2019-12-10T13:57:59.967

3

You can use the map method to transform all NaN values to 0 and all other values to themselves:

let arrayWithoutNaNs = yourArray.map { $0.isNaN ? 0 : $0 }

Since your arrays are long, you might also want consider doing this lazily by adding a .lazy before .map.

edited Dec 10 '19 at 13:57

answered Dec 10 '19 at 13:07

Sweeper

213,210
22
193
313

How to deal with NaN in large arrays using swift

1 Answers1