矩阵乘法函数C ++ [英] Matrix multiplication function C++
本文介绍了矩阵乘法函数C ++的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我似乎对我的矩阵乘法函数有一个问题。
I seem to have an issue with my matrix multiplication function.
当我运行程序,我只是得到一个nxn矩阵,所有的值相同,一些有线双值,例如21312e-2
这是我的功能代码:
When I run the program I just get an n x n matrix with all of the values the same, as some wired double value, e.g 21312e-2 Here is my function code:
void Multiply(int i, int j, double mat1[10][10], double mat2[10][10]) {
double mat3[10][10];
for (int r = 0; r < i; r++) {
for (int c = 0; c < j; c++) {
for (int in = 0; in < i; in++) {
mat3[r][c] += mat1[r][in] * mat2[in][c];
}
cout << mat3[r][c] << " ";
}
cout << "\n";
}
}
使用以下函数将mat1和mat 2读入主线程中的程序:
mat1 and mat 2 are read into the program in the main thread using the function read:
void read_matrix(int m, int n, double mat[10][10])
{
int i, j;
for (i = 0; i<m; ++i)
for (j = 0; j<n; ++j)
cin >> mat[i][j];
}
编辑:主代码
int main()
{
int i1, i2, j1, j2;
double mat1[10][10], mat2[10][10], mat3[10][10];
scanf_s("%d %d\n", &i1, &j1, mat1);
read_matrix(i1, j1, mat1);
scanf_s("%d %d\n", &i2, &j2, mat2);
read_matrix(i2, j2, mat2);
printf("%d x %d matrix\n", i1, j1);
print_matrix(i1, j1, mat1);
printf("\n%d x %d matrix\n", i2, j2);
print_matrix(i2, j2, mat2);
Multiply(i1, j2, mat1, mat2);
system("pause");
return 0;
}
推荐答案
c $ c> mat3 ,在添加之前为零值。
You need to fill mat3
with a zero value before adding to it.
最简单的方法是使用:
double mat3[10][10] = {};
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