MATLAB - 如何找到值大于阈值的第一个索引

Question

  

可能重复：
  Given a vector a=[1,2, 3.2, 4, 5] and an element x=3 In vector a, how to find the exact entry which is bigger than x?

假设[]是一个有序向量。如何找到第一个（最小的）索引ix，使得a（ix）＆gt;阈值ε

Answer 1

ix = find(a>threshold,1);

很确定这会起作用

Answer 2

ix = find(a > threshold, 1, 'first');

Answer 3

哎呀， 当且仅当a被排序时，你可以这样做：

ix = sum(a<=threshold)+1;