How to round a result to 1 decimal place.

I have a data of 4096x64 and would like to round it to 1 decimal place. When I use DATA = round(DATA,1), the error 'Too many input arguments' appear. Is there any other way to do this?

Answer 1

[Adam]

Which version of Matlab do you have?

round( data * 10 ) / 10;

is a fairly standard alternative.

[Amy Wong]

I am using version R2014a.

When I try that, some of my values have 4dp or some with e.

[Adam]

What are the values that end up with 4dp? I would have said that is impossible, off the top of my head...

The option for a 2nd argument to round was added in R2014b

[Amy Wong]

Like if my value is 0.33333, I want to get 0.3. But the result is 0.3000. Is there a way to remove the 0 at the back?

[Adam]

Not every decimal number is precisely representable in a double (after all, there are an infinite number of floating point numbers and clearly there are not an infinite number of bit-representations to represent these).

Why do you need it to be precisely 0.3?

Note: round( 0.3333, 1 ) in later Matlab also gives an answer with a lot of trailing 0s that isn't 100% precise to 1dp.