请问如何实现二维数组第一列相同数字的行求平均。
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比如下面a是2x7的原始数组,需要最后变成b,就是把第一列相同数字的行求平均
a=[1 2;1 4;2 3;2 5;3 4;3 7;3 1];
% b=[1 3;2 4;3 4];
谢谢各位大佬!
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