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matlab中报错Improper assignment with rectangular empty matrix.

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matlab中报错Improper assignment with rectangular empty matrix.
M=[1 2 3;4 5 6;7 8 9];
for i=1:1:size(M,2)
n(i)=find(M(:,i)==1);
m(i)=length(n(i));
end
我就是想找出每一列中1的个数,
matlab中报错Improper assignment with rectangular empty matrix.
最简单的写法：M=[1 2 3;4 5 6;7 8 9];
sum(M==1,1)结果：[1 0 0]
matlab出错,Improper assignment with rectangular empty matrix. matlab 如何求矩阵中NaN所在的位置 [m n]=find(a==NaN)命令后显示Empty matrix:为什 matlab Index exceeds matrix dimensions. identity matrix with appropriate size matlab中Index exceeds matrix dimensions.错误 matlab 急 Matrix dimensions must agree matlab Matrix must be square什么情况? matlab中Index exceeds matrix dimensions Matlab中Inner matrix dimensions must agree. matlab中Inner matrix dimensions must agree, Matlab计算Index exceeds matrix dimensions.为什么? MATLAB 中 Index exceeds matrix dimensions.错误