我有以下代码:
[~,ind]=max(Defender.Q,[],6);
Defender.Q
是一个巨大的多维矩阵。
当Defender.Q
的第6维有多个最大值时,max
函数
正在给我这些多个最大值中第一个的索引。我想得到一个索引
在多个最大值之间随机化。有任何想法吗?感谢您的帮助!
最佳答案
好吧,这有点复杂,但你可以获得所有最大值的索引,然后使用 randi
和 accumarray
随机选择一个:
%# (1) Find the maxima
%# if you are interested in the global maximum
%# that may occur multiple times along dimension 6
[maxVal,maxIdx] = max(Defender.Q(:));
%# ALTERNATIVELY
%# if you are interested in local maxima along dimension 6
maxVal = max(Defender.Q,[],6);
maxIdx = find(bsxfun(@eq,Defender.Q,maxVal));
%# (2) pick random maximum for each 5D subarray
%# this assumes that there is no dimension #7 etc
%# In case there is, you need to add a column of ones
%# and then d7 etc to second input of accumarray
%# find row, col, etc subscripts of the maxima
[d1,d2,d3,d4,d5,d6] = ind2sub(size(Defender.Q),maxIdx);
%# create a 5-d array, containing one random index
%# from the maxima along dimension 6, or NaN
randIdx = accumarray([d1,d2,d3,d4,d5],d6,[],@(x)x(randi(length(x))),NaN);
关于MATLAB:当有多个最大值时,如何不获取第一个元素而是从 "max"获取随机索引?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/10543716/