Is there a function or method that rounds a value towards a entries of a vector?

Say we have the value 5.5. If we do floor(5.5), we get 5. If we do ceil(5.5), we get 6. Is there a function or method that can be used to round 5.5 towards entries of a vector you provide? Take this example:

We have the vector 1.25:10.25 = 1.25, 2.25, 3.25, 4.25, 5.25, 6.25... we also have the value 5.5.

Is there a function that rounds 5.5 to a certain direction using the numbers in this vector?

"function"(5.5,1.25:10.25) = 5.25 And is there another function which can go the other direction? "otherfunction'(5.5, 1.25:10.25) = 6.25

Thanks for your help.

Answer 1

[Evan]

v = 1.25:10.25;
x = 5.5;
v(find(x-v>0,1,'last')); %round to nearest lower
v(find(x-v<0,1,'first')); %round to nearest higher

Answer 2

[Image Analyst]

See the Mathworks answer: http://www.mathworks.com/matlabcentral/answers/9641-how-do-i-round-to-the-nearest-arbitrary-enumerated-value-in-matlab