Round down to nearest 100

Hello I am doing timing phase correction in a QPSK system. Given a maximum power timing phase I need to round down to nearest 100.

Example:

If I get 568, I want to get 500.

Round(568,-2) gives 600. I need to always round down. What do you all suggest?

Answer 1

[Voss]

Divide by 100, then floor() or fix() (depending on how you want to handle negative numbers), then multiply by 100.

x = 568;

floor(x/100)*100

ans = 500

fix(x/100)*100

ans = 500

x = -568;

floor(x/100)*100

ans = -600

fix(x/100)*100

ans = -500

[Grant Brown]

thanks for the help!

[Voss]

You're welcome!