MATLAB is missing one essential rounding function!
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Okay, besides the normal rounding function we all know and love ("round"; rounding towards the nearest integer), we have the three special rounding functions: ceil, floor, and fix. We can use them to round towards positive infinity, negative infinity, and towards zero, respectively. But there is no function for rounding AWAY FROM ZERO.
Come on, guys. Let's complete the group of functions and get that last one defined and implemented. I need it right now.
0 Comments
Accepted Answer
Daniel Shub
on 26 Oct 2011
ceilfix = @(x)ceil(abs(x)).*sign(x);
or some such nonsense name.
ceilfix(-2:0.2:2)
2 Comments
More Answers (3)
Sean de Wolski
on 26 Oct 2011
function out = rafz(in)
%out = rafz(in), round away from zero
%SCd 10/26/2011
%
out = max(abs(ceil(in)),abs(floor(in))).*sign(in);
end
Now you have it! I couldn't come up with a better title, unfortunately.
Jim Luschen
on 26 Oct 2011
3 Comments
Daniel Shub
on 26 Oct 2011
But who is going to get their answer accepted? Sean was first and had a good name. I was second and had a crappy name, but potentially a better algorithm.
Make a request: http://www.mathworks.com/support/service_request/login_servicerequests.html?targetURL=/support/service_requests/contact_support.do
Tom Smits
on 14 Mar 2013
I was surprised as well that there was no 'round away from zero' function in MATLAB but eventually I figured that the solution is really simple, so I thought I'd share my findings:
ceilfix(x) = sign(x)+fix(x)
cheers
2 Comments
Teja Muppirala
on 15 Mar 2013
This won't work for nonzero integers:
ceilfix(1.0) = sign(1.0) + fix(1.0) = 1.0 + 1.0 = 2
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