Matlab矩阵相关，如图，要进行的计算是将两个矩阵中第四列数值相同的行进行相减。 Matlab里怎么把两矩阵的对应元素相减？并求所得所有元素的...
\u6c42matlab\u600e\u4e48\u628a\u4e00\u4e2a\u77e9\u9635\u4e2d\u4e24\u5217\u76f8\u51cf\u5408\u5e76\u6210\u4e00\u5217\uff0c\u5176\u4ed6\u4e0d\u53d8\u3002\u89e3\u51b3\u65b9\u6848\u5982\u4e0b\uff1a \u5f88\u5bb9\u6613\u7684\u3001\u5e0c\u671b\u5bf9\u4f60\u6709\u6240\u5e2e\u52a9\u3002
>> a=reshape(1:42,6,7)'
a =
1 2 3 4 5 6
7 8 9 10 11 12
13 14 15 16 17 18
19 20 21 22 23 24
25 26 27 28 29 30
31 32 33 34 35 36
37 38 39 40 41 42
>> a(:,4)=a(:,4)+a(:,5)
a =
1 2 3 9 5 6
7 8 9 21 11 12
13 14 15 33 17 18
19 20 21 45 23 24
25 26 27 57 29 30
31 32 33 69 35 36
37 38 39 81 41 42
>> a(:,5)=[]
a =
1 2 3 9 6
7 8 9 21 12
13 14 15 33 18
19 20 21 45 24
25 26 27 57 30
31 32 33 69 36
37 38 39 81 42
\u5047\u5982\u4e24\u4e2a\u77e9\u9635\u662fA\u548cB
\u5bf9\u5e94\u5143\u7d20\u76f8\u51cf\uff0c\u5b58\u5165C\u4e2d\uff1a
C = A - B;
\u518d\u6c42C\u4e2d\u6240\u6709\u5143\u7d20\u7684\u5e73\u65b9\u548c\uff1a
s = sum(sum(C .^ 2));
[m2,n2]=size(final_2);
m=max(m1,m2);
record=zeros(m,2);%record用于记录第四列相等元素在final_1和final_2中的位置，
num=0;
for i=1:m1
for j=1:m2
if( abs( final_1(i,4) - final_2(j,4) ) < 1e-6)
final_1(i,:) = final_1(i,:) - final_2(j,:);
num=num+1;
record(num,:)=[i,j];
end
end
end
final_1
record(1:num,:)
fin_1-fin_2 对应元素相减 是不可能的，行数不等你让咋减
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