回答編集履歴
2
誤字
test
CHANGED
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@@ -90,7 +90,7 @@
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90
90
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91
91
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追記
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92
92
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93
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-
２x２， 3x3 の行列も
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93
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+
２x２， 3x3 の行列も扱えるようにしてみたものを示します。
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94
94
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95
95
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```c
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96
96
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1
追記
test
CHANGED
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@@ -85,3 +85,101 @@
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85
85
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ARRAY_SIZE は行列の列数になってます。
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86
86
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87
87
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doub で dt1[ARRAY_SIZE][ARRAY_SIZE] のようにしているので。
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88
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+
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89
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+
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90
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91
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追記
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92
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+
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93
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+
２x２， 3x3 の行列もあつ反るようにしてみたものを示します。
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94
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95
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```c
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96
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97
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+
#include <stdio.h>
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98
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99
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100
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101
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void doub(int n, int dt1[][n], int dt2[][n], int dt3[][n]) {
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102
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103
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for (int i = 0; i < n; i++) {
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104
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105
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for (int j = 0; j < n; j++) {
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106
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+
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107
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dt3[i][j] = 0;
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108
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+
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109
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for (int k = 0; k < n; k++) {
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110
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111
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dt3[i][j] += dt1[i][k] * dt2[k][j];
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112
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+
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113
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}
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114
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+
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115
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}
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116
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+
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117
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}
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118
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+
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119
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}
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120
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+
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121
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122
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123
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+
void show_matrix(int n, int dt[][n]) {
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124
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125
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for (int i = 0; i < n; i++) {
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126
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+
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127
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+
for (int j = 0; j < n; j++) {
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128
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129
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printf("%3d", dt[i][j]);
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130
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131
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}
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132
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133
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printf("\n");
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134
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135
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}
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136
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137
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}
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138
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139
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140
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141
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+
int main(void)
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142
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143
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{
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144
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+
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145
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int dt2_1[2][2] = { {1,2},{2,3} };
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146
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+
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147
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+
int dt2_2[2][2] = { {3,4},{4,5} };
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148
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+
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149
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+
int dt2_3[2][2] = { {0,0},{0,0} };
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150
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+
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151
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+
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152
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+
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153
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+
doub(2, dt2_1, dt2_2, dt2_3);
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154
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+
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155
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show_matrix(2, dt2_3);
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156
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+
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157
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printf("\n");
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158
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159
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160
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161
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int dt3_1[3][3] = { {1,2,3},{2,3,0},{0,0,1} };
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162
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+
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163
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int dt3_2[3][3] = { {3,4,0},{4,5,0},{0,0,1} };
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164
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+
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165
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int dt3_3[3][3];
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166
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+
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167
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+
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168
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+
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169
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doub(3, dt3_1, dt3_2, dt3_3);
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170
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+
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171
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+
show_matrix(3, dt3_3);
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172
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+
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173
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+
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174
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+
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175
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+
return 0;
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176
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+
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177
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+
}
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178
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+
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179
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+
```
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180
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+
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181
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+
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182
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+
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183
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+
実行例
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184
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+
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185
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+
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