matlab - 大小未知的函数的输出

Question

我想在 matlab 中定义一个函数，它给出一个向量作为输入，并以矩阵的形式给出局部最小值作为输出。但我给出了这个错误:输出参数太多。这是我的代码

    function [index, value] = localminima(x)
    N = length(x);
    a = [];   
     b = [];   
%     at first a & b witch are index and value, respectively are empty
%     then, in the for loop indexes and values of local minimal are added
%     to a & b.
     for k = 2:N-1,
        if((x(k) < x(k+1)) && (x(k) < x(k-1)))
            a = [a; k];
            b = [b; x(k)];
        end
    end
    [index, value] = [a, b]

Answer 1

我认为这可以满足您的要求，没有循环:

d = diff(x);
ind = [false d<0] & [d>0 false];
a = find(ind);
b = x(ind);