Finding a value, index which lies between 2 points in an array

Hello fellow MATLAB users,

I am currently writing a MATLAB function for which I need some help.

For example:

I have an array and a value:

X = [0, 10, 20];
value = 17;

I need to find the indices of the X in which the value lies:

Here the answer will be X[2] and X[3].

But I am not sure how to do this. I would really appreciate any help I can get.

Thank You.

Answer 1

[Matt J]

i=discretize(value,X)
j = i+1
X([i,j])

[Yash Runwal]

Actually both of the answers work. I am gonna have to look up the functions discretize and interp1

Answer 2

[Matt J]

i = interp1(X,1:numel(X),value,'previous')
j = i+1

X([i,j])