matlab矩阵扩充
matlab \u77e9\u9635\u6269\u5145\u4f60\u662f\u60f3\u628aC\u52a0\u5165\u5230A\u4e4b\u4e2d\uff0c\u8ba9C\u6210\u4e3aA\u7684\u4e00\u884c\u5417\uff1f
\u53ef\u4ee5\u600e\u4e48\u5199\uff1a
B=[ A(1:2;:) ; C ; A(3;:)]
\u5176\u4e2dA(1:2;:)\u8868\u793a\u7684\u662fA\u7684\u7b2c\u4e00\u548c\u7b2c\u4e8c\u884c
A(3;:)\u8868\u793a\u7684\u662fA\u7684\u7b2c\u4e09\u884c
\u4e0a\u8ff0\u7684B \u5c31\u662f\u6307\u5728A\u7684\u7b2c\u4e8c\u548c\u7b2c\u4e09\u884c\u76f4\u63a5\u6dfb\u52a0\u4e00\u884cC
\u7528\u6cd5\uff1aB = imresize(A,m)
B = imresize(A,m,method)
B = imresize(A,[mrows ncols],method)
B = imresize(...,method,n)
B = imresize(...,method,h)
imrersize\u51fd\u6570\u4f7f\u7528\u7531\u53c2\u6570method\u6307\u5b9a\u7684\u63d2\u503c\u8fd0\u7b97\u6765\u6539\u53d8\u56fe\u50cf\u7684\u5927\u5c0f.method\u7684\u51e0\u79cd\u53ef\u9009\u503c\uff1a
book.iLoveMatlab.cn
'nearest'(\u9ed8\u8ba4\u503c)\u6700\u8fd1\u90bb\u63d2\u503c
'bilinear'\u53cc\u7ebf\u6027\u63d2\u503c
'bicubic'\u53cc\u4e09\u6b21\u63d2\u503c
B = imresize(A,m)\u8868\u793a\u628a\u56fe\u50cfA\u653e\u5927m\u500d
B = imresize(...,method,h)\u4e2d\u7684h\u53ef\u4ee5\u662f\u4efb\u610f\u4e00\u4e2aFIR\u6ee4\u6ce2\u5668(h\u901a\u5e38\u7531\u51fd\u6570ftrans2\u3001fwind1\u3001fwind2\u3001\u6216fsamp2\u7b49\u751f\u6210\u7684\u4e8c\u7ef4FIR\u6ee4\u6ce2\u5668).
result = repmat(A,len,len)
就ok了。
使用函数repmat
如：
B = repmat(eye(2),3,4)
结果如下：
B =
1 0 1 0 1 0 1 0
0 1 0 1 0 1 0 1
1 0 1 0 1 0 1 0
0 1 0 1 0 1 0 1
1 0 1 0 1 0 1 0
0 1 0 1 0 1 0 1
绛旓細MATLAB涓皢涓涓鐭╅樀鎵╁睍 20 鎴戠湅鍒版湁浜鸿繖鏍峰洖绛, B=zero(4) B(1:3,1:3)=A 浣嗘槸鎴戣繍琛屼竴涓嬪嚭鐜??? Undefined command/function 'zero' 鎴戞槸鎯虫墿灞曠煩闃电殑鍒,浣嗘墿灞曠殑鍒楅兘鏄0,瑕佹庝箞鍋,灏卞涓涓煩闃礎=[1 2;3 4;2 4;5 5] 瑕佹墿灞曟垚:B=[1 2 0 0;3 4 0 0;5 5 0 0] 鑻ユ槸鎵╁睍鎴怋=[...
绛旓細out = blkdiag(a,b,c,d,...)out = blkdiag(a,b,c,d,...) , where a , b , c , d , ... are matrices, outputs a block diagonal matrix of the form The input matrices do not have to be square, nor do they have to be of equal size.鍗筹細杈撳叆鐨鐭╅樀鍙互涓...
绛旓細a=randi(2,1,5)-1; %闅忔満浜х敓涓琛 A=a;n=1; %濉叆绗竴琛 while(n<N) %琛屾暟涓嶆弧瓒 a=randi(2,1,5)-1; %闅忔満浜х敓涓琛 if ~any(all(bsxfun(@eq,A,a),2))%姣旇緝濡傛灉娌℃湁閲嶅 A=[A;a]; %鎵╁厖涓琛 n=n+1; %琛屾暟鍔犱竴 end end ...
绛旓細绗竴绉嶅仛娉曪細>> 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)=AB = 8 1 6 0 3 5 7 0 4 9 2 0 0 0 0 0绗簩绉嶅仛娉曪細>> A=magic(3)A = ...
绛旓細MATLAB鏄痬atrix&laboratory涓や釜璇嶇殑缁勫悎锛屾剰涓虹煩闃靛伐鍘傦紙鐭╅樀瀹為獙瀹锛夈傛槸鐢辩編鍥絤athworks鍏徃鍙戝竷鐨勪富瑕侀潰瀵圭瀛﹁绠椼佸彲瑙嗗寲浠ュ強浜や簰寮忕▼搴忚璁＄殑楂樼鎶璁＄畻鐜銆傚畠灏嗘暟鍊煎垎鏋愩佺煩闃佃绠椼佺瀛︽暟鎹彲瑙嗗寲浠ュ強闈炵嚎鎬у姩鎬佺郴缁熺殑寤烘ā鍜屼豢鐪熺瓑璇稿寮哄ぇ鍔熻兘闆嗘垚鍦ㄤ竴涓槗浜庝娇鐢ㄧ殑瑙嗙獥鐜涓紝涓虹瀛︾爺绌躲佸伐绋嬭璁′互鍙...
绛旓細n = 3; //浠绘剰鍊嶆暟 [r c] = size(a); //浠绘剰鐭╅樀 for i = 1 : r for j = 1 : c b(n*(i-1)+1 : n*(i-1)+n,n*(j-1)+1 : n*(j-1)+n) = a(i,j)*ones(n,n);end end
绛旓細B=kron(eye(3),A);鍏朵腑3涓築涓惈鏈堿鐨勪釜鏁般傚鏋滀綘鐨凚鐭╅樀鏈塶涓狝鐭╅樀鐨勮瘽锛屾妸3鏀逛负n銆
绛旓細len = length(A)result = repmat(A,len,len)灏眔k浜嗐
绛旓細涓嶆槸zero,鑰屾槸zeros 浣犺鎵╁睍,鍙互杩欐牱:>>A=[1 2;3 4;2 4;5 5];>>B=zeros(4,2);>>C=[A,B]C= 1 2 0 0 3 4 0 0 2 4 0 0 5 5 0 0 >>C(3,:)=[];C C= 1 2 0 0 3 4 0 0 5 5 0 0 >>D...
绛旓細function r = my_reshape(a,m,n) % 瀛樹负 my_reshape.m[m0,n0] = size(a);mm = ceil(m/m0);nn = ceil(n/n0);r = repmat(a,mm,nn);r = r(1:m,1:n);%% 璋冪敤 a =[1 2 3;4 5 6];m = 5; n = 5;r = my_reshape(a,m,n)r = 1 2 3 1 2 4 ...
