MATLAB is missing one essential rounding function!

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Jim Luschen
Jim Luschen 2011-10-26
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.

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采纳的回答

Daniel Shub
Daniel Shub 2011-10-26
ceilfix = @(x)ceil(abs(x)).*sign(x);
or some such nonsense name.
ceilfix(-2:0.2:2)

更多回答（3 个）

Sean de Wolski
Sean de Wolski 2011-10-26
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
Jim Luschen 2011-10-26
Thank you Sean and Daniel -- I bow to your superior intellects!
But I still think MATLAB should add the function to their library. Similar trickery to yours can conjure "floor" from "ceil", and yet MATLAB includes both of those functions in their library.
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Daniel Shub
Daniel Shub 2011-10-26
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

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Tom Smits
Tom Smits 2013-3-14
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 个评论
Walter Roberson
Walter Roberson 2013-3-14
To confirm: is that addition rather than multiplication ?
Teja Muppirala
Teja Muppirala 2013-3-15
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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