matlab 如何将m行n列的矩阵A扩展成m+1行n+1列的矩阵B，多出来的值全都赋0 在MATLAB中如何将四行三列矩阵转换成二行六列矩阵？
matlab\u600e\u4e48\u5c06\u4e00\u4e2am\u884cn\u5217\u7684\u77e9\u9635\u8868\u793a\u6210m\u4e2a\u4e00\u884cn\u5217\u7684\u5411\u91cf\u4e3a\u4ec0\u4e48\u8981\u8fd9\u6837\u8868\u793a\u5462\uff1fMATLAB\u53ef\u4ee5\u5e2e\u52a9\u4f60\u968f\u65f6\u63d0\u53d6\u4f60\u60f3\u8981\u7684\u90a3\u4e00\u5217
\u6bd4\u5982x=[1,2,3;4,5,6;7,8,9];
\u90a3\u4e48y1=x(1,:);
y2=x(2,:);
y3=x(3,:);
\u5982\u679c\u4f60\u8981\u7528\u5230\u6bcf\u4e00\u884c\uff0c\u4e0d\u59a8\u8fd9\u6837\uff1a
for i=1:size(x,1)
y=x(i,:);
%\u8fd9\u91cc\u4f60\u968f\u4fbf\u6dfb\u8bed\u53e5
end
1:
A=rand(4,3);
A=[A(1,:),A(2,:);A(3,:),A(4,:)];
2:
\u7528reshape\u51fd\u6570
b=reshape(a,[m n]);
b=reshape(a,[2 6]);
\u6ce8\u610f\u8f6c\u6362\u540e\u548c\u8f6c\u6362\u524d\u7684\u5143\u7d20\u4e2a\u6570\u8981\u76f8\u7b49\u4e5f\u5c31\u662f2x6\u8981\u7b49\u4e8e3x4
1 \u77e9\u9635\u7684\u5efa\u7acb
1\uff0e\u76f4\u63a5\u8f93\u5165\u6cd5
\u6700\u7b80\u5355\u7684\u5efa\u7acb\u77e9\u9635\u7684\u65b9\u6cd5\u662f\u4ece\u952e\u76d8\u76f4\u63a5\u8f93\u5165\u77e9\u9635\u7684\u5143\u7d20\u3002\u5177\u4f53\u65b9\u6cd5\u5982\u4e0b\uff1a\u5c06\u77e9\u9635\u7684\u5143\u7d20\u7528\u65b9\u62ec\u53f7\u62ec\u8d77\u6765\uff0c\u6309 \u77e9\u9635\u884c\u7684\u987a\u5e8f\u8f93\u5165\u5404\u5143\u7d20\uff0c\u540c\u4e00\u884c\u7684\u5404\u5143\u7d20\u4e4b\u95f4\u7528\u7a7a\u683c\u6216\u9017\u53f7\u5206\u9694\uff0c\u4e0d\u540c\u884c\u7684\u5143\u7d20\u4e4b\u95f4\u7528\u5206\u53f7\u5206\u9694\u3002
2\uff0e\u5229\u7528M\u6587\u4ef6\u5efa\u7acb\u77e9\u9635
\u5bf9\u4e8e\u6bd4\u8f83\u5927\u4e14\u6bd4\u8f83\u590d\u6742\u7684\u77e9\u9635\uff0c \u53ef\u4ee5\u4e3a\u5b83\u4e13\u95e8\u5efa\u7acb\u4e00\u4e2aM\u6587\u4ef6\u3002\u4e0b\u9762\u901a\u8fc7\u4e00\u4e2a\u7b80\u5355\u4f8b\u5b50\u6765\u8bf4\u660e\u5982\u4f55\u5229\u7528M\u6587\u4ef6\u521b\u5efa\u77e9\u9635\u3002
\u4f8b2-2 \u5229\u7528M\u6587\u4ef6\u5efa\u7acbMYMAT\u77e9\u9635\u3002
(1) \u542f\u52a8\u6709\u5173\u7f16\u8f91\u7a0b\u5e8f\u6216MATLAB\u6587\u672c\u7f16\u8f91\u5668\uff0c\u5e76\u8f93\u5165\u5f85\u5efa\u77e9\u9635\uff1a
(2) \u628a\u8f93\u5165\u7684\u5185\u5bb9\u4ee5\u7eaf\u6587\u672c\u65b9\u5f0f\u5b58\u76d8(\u8bbe\u6587\u4ef6\u540d\u4e3amymatrix.m)\u3002
(3) \u5728MATLAB\u547d\u4ee4\u7a97\u53e3\u4e2d\u8f93\u5165mymatrix\uff0c\u5373\u8fd0\u884c\u8be5M\u6587\u4ef6\uff0c\u5c31\u4f1a\u81ea\u52a8\u5efa\u7acb\u4e00\u4e2a\u540d\u4e3aMYMAT\u7684\u77e9\u9635\uff0c\u53ef\u4f9b\u4ee5\u540e\u4f7f\u7528\u3002
3\uff0e\u5229\u7528\u5192\u53f7\u8868\u8fbe\u5f0f\u5efa\u7acb\u4e00\u4e2a\u5411\u91cf
\u5192\u53f7\u8868\u8fbe\u5f0f\u53ef\u4ee5\u4ea7\u751f\u4e00\u4e2a\u884c\u5411\u91cf\uff0c\u4e00\u822c\u683c\u5f0f\u662f\uff1a
e1:e2:e3
\u5176\u4e2de1\u4e3a\u521d\u59cb\u503c\uff0ce2\u4e3a\u6b65\u957f\uff0ce3\u4e3a\u7ec8\u6b62\u503c\u3002
\u5728MATLAB\u4e2d\uff0c\u8fd8\u53ef\u4ee5\u7528linspace\u51fd\u6570\u4ea7\u751f\u884c\u5411\u91cf\u3002\u5176\u8c03\u7528\u683c\u5f0f\u4e3a\uff1a
linspace(a,b,n)
\u5176\u4e2da\u548cb\u662f\u751f\u6210\u5411\u91cf\u7684\u7b2c\u4e00\u4e2a\u548c\u6700\u540e\u4e00\u4e2a\u5143\u7d20\uff0cn\u662f\u5143\u7d20\u603b\u6570\u3002
\u663e\u7136\uff0clinspace(a,b,n)\u4e0ea:(b-a)/(n-1):b\u7b49\u4ef7\u3002
4\uff0e\u5efa\u7acb\u5927\u77e9\u9635
\u5927\u77e9\u9635\u53ef\u7531\u65b9\u62ec\u53f7\u4e2d\u7684\u5c0f\u77e9\u9635\u6216\u5411\u91cf\u5efa\u7acb\u8d77\u6765\u3002
第一种做法：
>> A=magic(3)
A =
8 1 6
3 5 7
4 9 2
>> B=zeros(size(A)+1);
>> B(1:end-1,1:end-1)=A
B =
8 1 6 0
3 5 7 0
4 9 2 0
0 0 0 0
第二种做法：
>> A=magic(3)
A =
8 1 6
3 5 7
4 9 2
>> B=A;
>> B(end+1,end+1)=0
B =
8 1 6 0
3 5 7 0
4 9 2 0
0 0 0 0
B=zeros(m+1,n+1); B(1:m,1:n)=A;
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