How to compare a number with values of a vector?

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I have a vector. For example
A = [20 40 60 80 100 120]
I have a number as an input in a function
function imp(omega)
I need to compare the number omega with all the numbers of the vector. For example, the number is 30. I know 30 is in between 20 and 40. How do I find that by code?

Accepted Answer

Fangjun Jiang
Fangjun Jiang on 21 Sep 2018
A = [20 40 60 80 100 120];
x=30;
lowB=interp1(A,A,x,'previous')
HighB=interp1(A,A,x,'next')

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