MATLAB: Find(vector==value) not working

Question

Why does find(vector==value) not work? I am trying to find the index of a value of 0.16 in a vector defined as vector=0:0.01:0.3. find(vector==0.16) should return 17 but returns an empty vector. Why?

Answer 1

You have encountered floating-point approximation error. See the documentation on Floating-Point Numbers for a full explanation.

Try this:

vector=0:0.01:0.3;
Result = find(vector<=0.16, 1, 'last');

producing:

Result =
    17