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

7 views (last 30 days)
Muhammad Salem on 3 Dec 2023
Commented: Walter Roberson on 4 Dec 2023
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 ?

John D'Errico on 3 Dec 2023
Edited: John D'Errico on 3 Dec 2023
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 on 4 Dec 2023
Thank you so much.
Walter Roberson on 4 Dec 2023
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

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