matlab多个长度为3的数组，个数不确定，怎么从每一个数组中取一个数字，得到全排列 matlab 编程 列举从a数组集合中选出m个数组进行全排列...
\u5982\u4f55\u5229\u7528matlab\u628a\u591a\u7ec4\u5411\u91cf\u6392\u5217\u7ec4\u5408\u3002\u751f\u6210\u5168\u6392\u5217\u53ef\u4ee5\u7528perms\u51fd\u6570\uff0c\u628a\u5404\u5411\u91cf\u653e\u5728\u5143\u80de\u6570\u7ec4\u4e2d\uff0c\u7136\u540e\u6309\u7167\u5168\u6392\u5217\u6765\u7ec4\u5408\u5373\u53ef\uff1a
M = {[1 2 3]; [4 5 6]; [7 8 9]};
I=perms(1:3);
C=mat2cell(I,ones(6,1),3);
R=cellfun(@(ii)[M{ii}],C,'UniformOutput',false)
\u8fd9\u6837\u5f97\u5230\u7684\u7ed3\u679cR\u662f\u4e00\u4e2a\u5143\u80de\u6570\u7ec4\uff0c\u5176\u6bcf\u4e2a\u5143\u7d20\u5206\u522b\u662f\u4e00\u4e2a\u7ec4\u5408\u51fa\u6765\u7684\u5411\u91cf\u3002
>> cellfun(@(c)fprintf('%s\n',mat2str(c)),R)
[7 8 9 4 5 6 1 2 3]
[7 8 9 1 2 3 4 5 6]
[4 5 6 7 8 9 1 2 3]
[4 5 6 1 2 3 7 8 9]
[1 2 3 4 5 6 7 8 9]
[1 2 3 7 8 9 4 5 6]
cc = 2; % \u6bcf\u4e2a\u6570\u7ec4\u5217\u6570M = 4; % \u6570\u7ec4\u4e2a\u6570for k = 1:M rr = fix(4*rand)+1; % \u968f\u673a\u884c\u6570 a{k} = rand(rr,cc);end% \u524d\u9762\u662f\u751f\u6210\u5b9e\u9a8c\u6570\u636e\uff0c\u6709\u6570\u636e\u5c31\u4e0d\u7528\u4e86% \u6709\u6570\u636e a% M = size(a,1);m = 2; % m <= Mid = nchoosek(1:M,m);for k = 1:size(id,1) temp = []; for p = 1:m temp = [temp; a{id(k,p)}]; end R{k} = temp;end
这个不叫全排列吧，应该叫全组合。
编了个函数给你：
function C = allcombs(varargin)
n = nargin;
if n < 2, error('Insufficient input'); end
s = '[x1';
for i=2:n
s = [s sprintf(',x%i',i)];
end
s = [s ']=ndgrid(varargin{:});'];
eval(s);
s = '[x1(:)';
for i=2:n
s = [s sprintf(',x%i(:)',i)];
end
s = [s ']'];
C = eval(s);
调用示例：
a = [1 2];
b = [3 4 5];
c = [6 7];
C = allcombs(a,b,c)
运行结果
C =
1 3 6
2 3 6
1 4 6
2 4 6
1 5 6
2 5 6
1 3 7
2 3 7
1 4 7
2 4 7
1 5 7
2 5 7
首先是提取放到一个数组里。这可以用eval函数+对应命名的表示式实现。然后再计算全排列。
绛旓細C = 1 3 6 2 3 6 1 4 6 2 4 6 1 5 6 2 5 6 1 3 7 2 3 7 1 4 7 2 4 7 1 5 7 2 5 7
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绛旓細鍦matlab涓锛屼簩缁鏁扮粍鍙互鐪嬩綔2涓竴缁存暟缁勶紝姣斿瑕佽緭鍏ヤ簩缁存暟缁 a = {{1,2,3},{4,5,6},{7,8,9}} 锛屽湪command window(鍛戒护绐楀彛锛夊涓嬫墍绀鸿緭鍏ュ嵆鍙細>> a = [1,2,3;4,5,6;7,8,9]鍙互鐪嬪埌锛岃緭鍏ュ悗command window浼氳緭鍑鸿浜岀淮鏁扮粍锛堢煩闃碉級锛屽涓嬪浘鎵绀猴紙绾㈣壊绠ご鍗充负杈撳嚭鐭╅樀锛夈傚叾瀹...
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绛旓細濡傛灉鍚勪釜鏁扮粍鐨勯暱搴涓鏍凤紝鍙互鐩存帴鐢ㄧ煩闃电殑姣忎竴鍒楁垨姣忎竴琛屼唬琛ㄤ竴涓暟缁勩傚鏋滃悇涓鏁扮粍闀垮害涓嶄竴鏍凤紝鍙互鐢ㄧ粏鑳炵被鍨嬪瓨鍌紝姣忎釜缁嗚優鍏冨氨鏄涓涓暟缁勩傛瘮濡侫{1}=[1,2,3,4];A{2}=[5,6,7];
