See if the more recent versions of the round (link) function (that allow rounding to a specific number of decimal places) will do what you want.
If you don’t have it, use this emulation of it to round your variables to a specific number of decimal places:
roundn = @(x,n) round(x .* 10.^n)./10.^n; % Round ‘x’ To ‘n’ Digits, Emulates Latest ‘round’ Function
