Standard deviation dev

The dev function returns the standard deviation of a given list of numbers. Always returns a float value.

↪ (dev [1 2 3 4 50])
19.03

↪ (dev [1i 2i])
0.5

↪ (dev 1)
0.0

↪ (dev [1 0Nl 2])
0.5

↪ (dev [0Nf -2.0 10.0 11.0 5.0 0Nf])
5.15

↪ (dev [0Nl 1 2 3 4 50 0Nl])
19.03

Notes

• Returns 0Nf (null float) for null inputs: (dev [0Ni]) → 0Nf
• Null values in vectors are skipped during calculation
• Always returns float, even for integer inputs
• Single values return 0.0 (no deviation)