How can I cut four numbers after the decimal number without rounding using MATLAB ?

I have a number like this:

2.32166873546944

I want to take only four numbers after the decimal point and without rounding, that is, I only want:

2.3216

How do I do this in Matlab ?

Answer 1

[John D'Errico]

You want to truncate after the 4th decimal place? Easy peasy.

You shift where the decimal place lies, then use floor.

format long g
x = 2.32166873546944

x = 
          2.32166873546944

y = floor(x*10000)/10000

y = 
                    2.3216

[Muhammad Salem]

Thank you so much.

[Walter Roberson]

If you want "four digits after the decimal place" you should probably use fix() instead of floor()

format long g
x = 2.32166873546944

x = 
          2.32166873546944

xn = -x

xn = 
         -2.32166873546944

y1 = floor(x*10000)/10000

y1 = 
                    2.3216

y2 = fix(x*100000)/100000

y2 = 
                   2.32166

y3 = floor(xn*10000)/10000

y3 = 
                   -2.3217

y4 = fix(xn*10000)/10000

y4 = 
                   -2.3216