Function/method to truncate the fractional part of a number in Matlab

In C-programming, if I want to truncate and display the decimal places of a number to certain units, I can do that so by giving %x.xf in printf().

For example: float y = 99.0/1000;

To truncate the fractional part to two decimal places, I can write the following statement:

printf("y =%.2f",y);

Can you suggest a similar statement or function in Matlab to realize the same (considering that I want to perform a similar operation to a variable x = 12.34567 truncated to two decimal places)?

Answer 1

[Sean de Wolski]

Well, for display purposes you can do it the same way as you do in C by passing a format specifier into fprintf or sprintf

x = 12.34567
fprintf('%.2f\n',x)

However, it's important to note that the variable is a double precision floating point value so this isn't actually truncating the value, it's just changing the display options.

doc fprintf %more info

Answer 2

[Simon]

Hi!

To get the fractional part you may use

fractionalpart = x - floor(x)

Try it with "x=pi" for example. And try it with "x=-pi" as well, you will see that you have to get the fractional part depending on the sign of x!