r語(yǔ)言基本數(shù)據(jù)結(jié)構(gòu)(經(jīng)典)-wenkub
2022-09-02 00:31:31 本頁(yè)面
【正文】 In a6 + a2 : 長(zhǎng)的對(duì)象長(zhǎng)度不是短的對(duì)象長(zhǎng)度的整倍數(shù) a71:24 a7+a2 錯(cuò)誤 : dims [product 12]與對(duì)象長(zhǎng)度 [24]不匹配 一維數(shù)組并不等效為向量 不同長(zhǎng)度的向量運(yùn)算兩個(gè)數(shù)組的外積 Aarray(1:4,dim=c(2,2)) Barray(1:12,dim=c(3,4)) A [,1] [,2] [1,] 1 3 [2,] 2 4 B [,1] [,2] [,3] [,4] [1,] 1 4 7 10 [2,] 2 5 8 11 [3,] 3 6 9 12 B%o%A , , 1, 1 [,1] [,2] [,3] [,4] [1,] 1 4 7 10 [2,] 2 5 8 11 [3,] 3 6 9 12 , , 2, 1 [,1] [,2] [,3] [,4] [1,] 2 8 14 20 [2,] 4 10 16 22 [3,] 6 12 18 24 , , 1, 2 [,1] [,2] [,3] [,4] [1,] 3 12 21 30 [2,] 6 15 24 33 [3,] 9 18 27 36 , , 2, 2 [,1] [,2] [,3] [,4] [1,] 4 16 28 40 [2,] 8 20 32 44 [3,] 12 24 36 48 ABouter(B,A,“*”) ?outer() 數(shù)組轉(zhuǎn)置 ? aperm(a,perm,resize=TRUE) a為數(shù)組，perm為轉(zhuǎn)置下標(biāo)向量 xarray(1:6,2:3) x [,1] [,2] [,3] [1,] 1 3 5 [2,] 2 4 6 xtaperm(x,c(2,1)) xt [,1] [,2] [1,] 1 2 [2,] 3 4 [3,] 5 6 x array(1:24, 2:4) x , , 1 [,1] [,2] [,3] [1,] 1 3 5 [2,] 2 4 6 , , 2 [,1] [,2] [,3] [1,] 7 9 11 [2,] 8 10 12 , , 3 [,1] [,2] [,3] [1,] 13 15 17 [2,] 14 16 18 , , 4 [,1] [,2] [,3] [1,] 19 21 23 [2,] 20 22 24 xt aperm(x, c(2,1,3)) xt , , 1 [,1] [,2] [1,] 1 2 [2,] 3 4 [3,] 5 6 , , 2 [,1] [,2] [1,] 7 8 [2,] 9 10 [3,] 11 12 , , 3 [,1] [,2] [1,] 13 14 [2,] 15 16 [3,] 17 18 , , 4 [,1] [,2] [1,] 19 20 [2,] 21 22 [3,] 23 24 七、矩陣 nrow定義行數(shù)， ncol定義列數(shù)， dimnames定義行和列的名稱， byrow定義矩陣的填充順序，為 T時(shí)按行填充，為 F時(shí)按列填充 mdat matrix(c(1,2,3, 11,12,13), nrow = 2, ncol=3, byrow=TRUE, +dimnames = list(c(row1, row2), c(, , ))) mdat row1 1 2 3 row2 11 12 13 t(mdat) row1 row2 1 11 2 12 3 13 xt aperm(mdat, c(2,1)) xt row1 row2 1 11 2 12 3 13 轉(zhuǎn)置 a1matrix(c(1,2,3,4,5,6),nrow=2,ncol=3) a2matrix(seq(1:9),nrow=3,ncol=3) a1 [,1] [,2] [,3] [1,] 1 3 5 [2,] 2 4 6 a2 [,1] [,2] [,3] [1,] 1 4 7 [2,] 2 5 8 [3,] 3 6 9 a1%*%a2 [,1] [,2] [,3] [1,] 22 49 76 [2,] 28 64 100 a1%*%a1 錯(cuò)誤于 a1 %*% a1 : 非整合參數(shù) a2%*%a1 錯(cuò)誤于 a2 %*% a1 : 非整合參數(shù) 兩個(gè)矩陣內(nèi)積 Coefficientarray(c(3,2,2,1),dim=c(2,2)) 系數(shù)矩陣 Resultc(12,1) 結(jié)果矩陣 solve(Coefficient,Result) sovle()返回線性方程組行列式結(jié)果 [1] 2 3 a=2,b=3 求解線性方程組： 3a2b=12 2a+b=1 solve(Coefficient) 求矩陣 Coefficient的逆 [,1] [,2] [1,] [2,] 矩陣計(jì)算函數(shù) 練習(xí) 數(shù)組矩陣合并 ? 函數(shù) rbind()把參數(shù)變量按行拼成一個(gè)大矩陣 ,兩個(gè)數(shù)組 (或向量 )的列數(shù)必須相等 ? 函數(shù) cbin
公司管理相關(guān)推薦
鄂ICP備17016276號(hào)-1