Controlling the precision of floating point number in matlab

Question

I am dividing a number, say

x=2;
y=1/3;
z=x*y;

I expect z to be 0.66666666666667 i.e. 14 numbers after decimal point and the same

Answer 1

If you actually want the number to have that precision then round off to 14 places like this:

format long g

x=2;
y=1/3;
z=x*y;
round(z*1e14)/1e14

ans =      0.66666666666667

If it's just about displaying then use Deve's sprintf solution.