matlab如何做矩阵求和 求教！matlab矩阵行和列怎样求和？
matlab\u4e2d\u6709\u6ca1\u6709\u4ec0\u4e48\u547d\u4ee4\u53ef\u4ee5\u8ba9\u77e9\u9635\u4e2d\u6240\u6709\u5143\u7d20\u76f8\u52a0\u554asum\u51fd\u6570\u53ef\u4ee5\u5b9e\u73b0\u76ee\u6807\u3002
S1 = sum(A)
\u5982\u679cA\u662f\u884c\u5411\u91cf\u6216\u8005\u5217\u5411\u91cf\uff0c\u8be5\u4ee3\u7801\u53ef\u5f97\u5230A\u4e2d\u6240\u6709\u5143\u7d20\u7684\u548c\u3002
\u5982\u679cA\u662f\u77e9\u9635\uff0c\u8be5\u4ee3\u7801\u53ef\u5f97\u5230\u4e00\u4e2a\u884c\u5411\u91cf\uff0c\u8be5\u884c\u5411\u91cf\u6bcf\u4e2a\u5143\u7d20\u5bf9\u5e94\u6bcf\u4e00\u5217\u6240\u6709\u5143\u7d20\u7684\u548c\u3002
S2 = sum(sum(A))
\u5728\u4e0a\u8ff0\u57fa\u7840\u4e0a\uff0c\u5982\u679c\u5bf9A\u7684\u6bcf\u4e00\u5217\u6c42\u548c\u5f97\u5230\u7684\u884c\u5411\u91cf\u7ee7\u7eed\u8fd0\u7528sum\u884c\u6570\uff0c\u5373\u53ef\u5f97\u5230A\u4e2d\u6240\u6709\u5143\u7d20\u7684\u548c\u3002
\u5b9e\u4f8b\uff1aA\u662f\u4e00\u4e2a3*3\u7684\u5168\u4e3a1\u7684\u77e9\u9635\uff0c\u5bf9A\u4e2d\u6240\u6709\u5143\u7d20\u6c42\u548c:
\u6269\u5c55\u8bf4\u660e\uff1a
sum\u51fd\u6570\u662f\u6c42\u548c\u51fd\u6570\u3002
\u4e3e\u4f8b\uff1aS1 = sum(A)
\u5982\u679cA\u662f\u884c\u5411\u91cf\u6216\u8005\u5217\u5411\u91cf\uff0c\u8be5\u4ee3\u7801\u53ef\u5f97\u5230A\u4e2d\u6240\u6709\u5143\u7d20\u7684\u548c\u3002
\u5982\u679cA\u662f\u77e9\u9635\uff0c\u8be5\u4ee3\u7801\u53ef\u5f97\u5230\u4e00\u4e2a\u884c\u5411\u91cf\uff0c\u8be5\u884c\u5411\u91cf\u6bcf\u4e2a\u5143\u7d20\u5bf9\u5e94\u6bcf\u4e00\u5217\u6240\u6709\u5143\u7d20\u7684\u548c\u3002
sum(A) \u5f97A\u7684\u5217\u548c
sum(A') \u5f97A\u7684\u884c\u548c
\u6211\u53ea\u77e5\u9053\u8fd9\u4e00\u70b9\u54c8, \u7f16\u7a0b\u6211\u53ef\u4e0d\u4f1a...
if nargin==0
a=magic(5);
end
if size(a,1)==size(a,2)
disp('求和前的矩阵是'),a
as=length(a);
for i=1:as
a(i,i)=sum(a(i,:))-a(i,i);
end
disp('求和后的矩阵是'),a
else
disp('请输入方阵!');
end
绛旓細鍙厛姹傚垪鍜岋紝鐒跺悗灏嗗垪鍜岀粍鎴愮殑鍚戦噺杞疆锛屾渶鍚庡啀瀵硅浆缃悗鐨勫悜閲忔眰鍒楀拰銆備緥瀵鐭╅樀A姹傛墍鏈夊厓绱犵殑鍜岋紝鍙細sum((sum(A))')銆備緥锛欰 =16 3 2 135 10 11 89 6 7 124 15 14 1 >> sum((sum(A))')ans = 136 matlab涓灏忔暟鍙栨暣鐨勫嚱鏁板ぇ绾︽湁鍥涗釜锛歠lo...
绛旓細sum鍑芥暟鍙互瀹炵幇鐩爣銆係1 = sum(A)濡傛灉A鏄鍚戦噺鎴栬呭垪鍚戦噺锛岃浠ｇ爜鍙緱鍒癆涓墍鏈夊厓绱犵殑鍜屻傚鏋淎鏄鐭╅樀锛岃浠ｇ爜鍙緱鍒颁竴涓鍚戦噺锛岃琛屽悜閲忔瘡涓厓绱犲搴旀瘡涓鍒楁墍鏈夊厓绱犵殑鍜屻係2 = sum(sum(A))鍦ㄤ笂杩板熀纭涓婏紝濡傛灉瀵笰鐨勬瘡涓鍒姹傚拰寰楀埌鐨勮鍚戦噺缁х画杩愮敤sum琛屾暟锛屽嵆鍙緱鍒癆涓墍鏈夊厓绱犵殑鍜屻傚疄渚嬶細A...
绛旓細A=rand(1000,2);A=repmat(A,1,2);A=A';A=A(:);A=A(3:end-2);f=reshape(A(:),4,999);S=sum(f);
绛旓細function matrixsum(a)if nargin==0 a=magic(5);end if size(a,1)==size(a,2)disp('姹傚拰鍓嶇殑鐭╅樀鏄'),a as=length(a);for i=1:as a(i,i)=sum(a(i,:))-a(i,i);end disp('姹傚拰鍚庣殑鐭╅樀鏄'),a else disp('璇疯緭鍏ユ柟闃!');end ...
绛旓細a=[1 2 3;4 5 6;7 8 9];[m,n]=size(a);b=cumsum(a,2);R=b(:,2:m)浠ヤ笂涓よ浠ｇ爜鍙渶瑕佹敼a鍗冲彲锛宎鐨勭淮鏁伴殢渚挎敼锛屽叾浣欑殑涓嶅姩瀹冿紝R灏辨槸浣犳兂瑕佺殑 浜叉祴鍙敤~鍝噷涓嶆噦鍙互缁х画闂垜鍝
绛旓細sum(X,1)鏄寜鍒姹傚拰,姣斿 X = 1 1 1 1 2 2 2 2 >> sum(X,1)ans = 3 3 3 3 sum(X,2)鏄寜琛屾眰鍜,>> sum(X,2)ans = 4 8
绛旓細sum(A)鏄皢A鐨勫厓绱犻愯鐩稿姞,sum(A,2)鑾峰緱閫愬垪鐩稿姞鐨勭粨鏋滐紝鑰宻um(A,1)璺焥um(A)鏁堟灉涓鏍枫備緥濡 >> A=randn(5)A = -0.2340 0.6232 0.2379 0.3899 -0.9499 0.1184 0.7990 -1.0078 0.0880 0.7812 0.3148 0.9409 -0.7420 -0.6355 0.5690...
绛旓細璁鐭╅樀涓篈锛屽垯瀵笰鐨勬墍鏈夊厓绱 姹傚拰:sum(sum(A))鍧囧:mean(mean(A))鍧囨柟宸畇td(std(A))
绛旓細1銆佺煩闃电被鍨嬪彲浠ユ槸浠讳綍鏁板瓧绫诲瀷锛屽寘鎷鏁般2銆鐭╅樀鐩稿姞锛岃姹傜淮鏁扮浉鍚岋紝涔熷氨鏄鍜屽垪鏁伴兘鏈夌浉鍚岋紝鍚﹀垯浼氭姤閿 3銆鐭╅樀姹傚拰锛屼娇鐢ㄥ嚱鏁皊um
绛旓細a=[1 2 3 4;2 3 4 5;3 4 5 6];b=[1;2;3];d=[b,b,b,b];%鐭╅樀鎷兼帴 c=a+d 杩欎釜鏄渶绗ㄧ殑鍔炴硶锛屽垱寤虹煩闃礑锛孌鏄3*4鐭╅樀锛屾瘡鍒楅兘鏄竴涓狟锛岀劧鍚庤A+D灏辨槸浣犺鐨凜浜
