from numpy array to csv - rounding

[SchroedingersLion]

Greetings,

I have a 2D numpy array

ARR

storing a bunch of floats. I want to print it row by row to a .csv file, but rounded to 3 significant digits.
Is there a simple way to do this?
This is what I currently have. It prints the array without rounding.

    
with open('./results', 'w') as f:
        writer = csv.writer(f, delimiter=" ")
                 
        for row in ARR:
            writer.writerow(row)  

Cheers!