package test; public class MatrixTest { public static void main(String[] args) { System.out.println("hw5_2: ¿ëµ¿Áß"); // Çà·Ä x, yÀÇ °öÀ» ±¸ÇÏ¿© Ãâ·Â int[][] x = { {4, 4, 4, 4, 4, 4}, {4, 4, 4, 4, 4, 4}, {4, 4, 4, 4, 4, 4}, {4, 4, 4, 4, 4, 4}, {4, 4, 4, 4, 4, 4}, {4, 4, 4, 4, 4, 4} }; int[][] y = { {2, 2, 2, 2, 2, 2}, {2, 2, 2, 2, 2, 2}, {2, 2, 2, 2, 2, 2}, {2, 2, 2, 2, 2, 2}, {2, 2, 2, 2, 2, 2}, {2, 2, 2, 2, 2, 2} }; int[][] z = MyMatrixService.multiply(x, y); MyMatrixService.print(z); System.out.println(); // Çà·Ä a, bÀÇ °öÀ» ±¸ÇÏ¿© Ãâ·Â int[][] a = { {1, 1, 1}, {2, 2, 2}, {1, 2, 3}, {4, 5, 6} }; int[][] b = { {1, 1, 1, 1, -3}, {1, 2, 3, 4, 5}, {-2, 0, 6, 9, 12} }; int[][] c = MyMatrixService.multiply(a, b); MyMatrixService.print(c); } } class MyMatrixService { // (1) Á¤Àû ¸Þ¼Òµå multiply¸¦ ÀÛ¼ºÇϽÿÀ. // ÀÌÂ÷¿ø Á¤¼ö ¹è¿­·Î Ç¥ÇöµÈ µÎ°³ÀÇ Çà·ÄÀ» ¸Å°³º¯¼ö·Î ¹Þ¾Æ °öÀ» ±¸ÇØ °á°ú¸¦ ÀÌÂ÷¿ø Á¤¼ö ¹è¿­·Î Ç¥ÇöÇÏ¿© ¸®ÅÏ // ¸Å°³º¯¼ö·Î ¹ÞÀº µÎ Çà·ÄÀº °öÀ» ±¸Çϱ⿡ Ÿ´çÇÑ Å©±â¶ó°í °¡Á¤Çصµ µÊ public static int[][] multiply(int[][] x, int [][] y){ int z[][] = new int[x.length][y[0].length]; for (int i = 0; i < x.length; i++) { for (int j = 0; j < y[0].length; j++) { for (int k = 0; k < y.length; k++) { z[i][j] += x[i][k] * y[k][j]; } } } return z; } // (2) Á¤Àû ¸Þ¼Òµå print¸¦ ÀÛ¼ºÇϽÿÀ. // ÀÌÂ÷¿ø Á¤¼ö ¹è¿­·Î Ç¥ÇöµÈ ÇϳªÀÇ Çà·ÄÀ» ¸Å°³º¯¼ö·Î ¹Þ¾Æ ÇÑ ÁÙ¿¡ ÇÑ Ç྿ Ãâ·Â public static void print(int[][] z) { for (int i = 0; i < z.length; i++) { for (int j = 0; j < z[0].length; j++) { System.out.print(z[i][j] + " "); } System.out.println(); } } } /* --------------------------------------------------------- 2Â÷¿ø Á¤¼ö ¹è¿­·Î Ç¥ÇöµÈ Çà·ÄÀÇ °öÀ» ±¸ÇÏ¿© Ãâ·ÂÇÏ´Â ÇÁ·Î±×·¥À» ÀÛ¼ºÇϽÿÀ. ÷ºÎÇÑ ÆÄÀÏ¿¡¼­ ÁÖ¼®À» Âü°íÇÏ¿© (1), (2) ºÎºÐÀ» ¿Ï¼ºÇϽÿÀ. - ½ÇÇà ¿¹: hw5_2: È«±æµ¿ 48 48 48 48 48 48 48 48 48 48 48 48 48 48 48 48 48 48 48 48 48 48 48 48 48 48 48 48 48 48 48 48 48 48 48 48 0 3 10 14 14 0 6 20 28 28 -3 5 25 36 43 -3 14 55 78 85 ---------------------------------------------------------- */