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【C】实现矩阵相乘
作者:小?伟 / 发布于2012/10/22/ 570
实现矩阵相乘
#include <iostream></div>
<div>using namespace std;</div>
<div></div>
<div>void MatrixMultiplication(double *m1,double *m2,double *m3,int m,int n,int k)</div>
<div>{</div>
<div><span class="Apple-tab-span" style="white-space:pre">	</span>for(int i=0;i<m;i++)</div>
<div><span class="Apple-tab-span" style="white-space:pre">	</span>{</div>
<div><span class="Apple-tab-span" style="white-space:pre">		</span>for(int j=0;j<k;j++)</div>
<div><span class="Apple-tab-span" style="white-space:pre">		</span>{</div>
<div><span class="Apple-tab-span" style="white-space:pre">			</span>double sum = 0.0;</div>
<div><span class="Apple-tab-span" style="white-space:pre">			</span>for(int jj=0;jj<n;jj++)</div>
<div><span class="Apple-tab-span" style="white-space:pre">			</span>{</div>
<div><span class="Apple-tab-span" style="white-space:pre">				</span>sum += *(m1+i*n+jj)*(*(m2+jj*k+j));</div>
<div><span class="Apple-tab-span" style="white-space:pre">			</span>}
<div><span class="Apple-tab-span" style="white-space:pre">			</span>*(m3+i*k+j) = sum;</div>
<div><span class="Apple-tab-span" style="white-space:pre">		</span>}
<div><span class="Apple-tab-span" style="white-space:pre">	</span>}
<div>}
<div></div>
<div>int main(int argc, char* argv[])</div>
<div>{</div>
<div><span class="Apple-tab-span" style="white-space:pre">	</span>int m = 1 , n = 3 , k = 3;</div>
<div><span class="Apple-tab-span" style="white-space:pre">	</span>double *m1,*m2,*m3;</div>
<div><span class="Apple-tab-span" style="white-space:pre">	</span>m1 = new double[m*n];</div>
<div><span class="Apple-tab-span" style="white-space:pre">	</span>m2 = new double[n*k];</div>
<div><span class="Apple-tab-span" style="white-space:pre">	</span>m3 = new double[m*k];</div>
<div></div>
<div><span class="Apple-tab-span" style="white-space:pre">	</span>//[50<span class="Apple-tab-span" style="white-space:pre">	</span>50<span class="Apple-tab-span" style="white-space:pre">	</span>1]</div>
<div><span class="Apple-tab-span" style="white-space:pre">	</span>*(m1+n*0+0) = 50;</div>
<div><span class="Apple-tab-span" style="white-space:pre">	</span>*(m1+n*0+1) = 50;</div>
<div><span class="Apple-tab-span" style="white-space:pre">	</span>*(m1+n*0+2) = 1;</div>
<div></div>
<div><span class="Apple-tab-span" style="white-space:pre">	</span>//[1<span class="Apple-tab-span" style="white-space:pre">	</span>0<span class="Apple-tab-span" style="white-space:pre">	</span>0]</div>
<div><span class="Apple-tab-span" style="white-space:pre">	</span>//[0<span class="Apple-tab-span" style="white-space:pre">	</span>1<span class="Apple-tab-span" style="white-space:pre">	</span>0]</div>
<div><span class="Apple-tab-span" style="white-space:pre">	</span>//[200, 200,1]</div>
<div><span class="Apple-tab-span" style="white-space:pre">	</span>*(m2+k*0+0) = 1;</div>
<div><span class="Apple-tab-span" style="white-space:pre">	</span>*(m2+k*0+1) = 0;</div>
<div><span class="Apple-tab-span" style="white-space:pre">	</span>*(m2+k*0+2) = 0;</div>
<div><span class="Apple-tab-span" style="white-space:pre">	</span>*(m2+k*1+0) = 0;</div>
<div><span class="Apple-tab-span" style="white-space:pre">	</span>*(m2+k*1+1) = 1;</div>
<div><span class="Apple-tab-span" style="white-space:pre">	</span>*(m2+k*1+2) = 0;</div>
<div><span class="Apple-tab-span" style="white-space:pre">	</span>*(m2+k*2+0) = 200;</div>
<div><span class="Apple-tab-span" style="white-space:pre">	</span>*(m2+k*2+1) = 200;</div>
<div><span class="Apple-tab-span" style="white-space:pre">	</span>*(m2+k*2+2) = 1;</div>
<div></div>
<div><span class="Apple-tab-span" style="white-space:pre">	</span>MatrixMultiplication(m1,m2,m3,m,n,k);</div>
<div></div>
<div><span class="Apple-tab-span" style="white-space:pre">	</span>cout<<"["<<*(m3+k*0+0)<<" ";</div>
<div><span class="Apple-tab-span" style="white-space:pre">	</span>cout<<*(m3+k*0+1)<<" ";</div>
<div><span class="Apple-tab-span" style="white-space:pre">	</span>cout<<*(m3+k*0+2)<<"]"<<endl;</div>
<div></div>
<div><span class="Apple-tab-span" style="white-space:pre">	</span>delete[] m1;</div>
<div><span class="Apple-tab-span" style="white-space:pre">	</span>delete[] m2;</div>
<div><span class="Apple-tab-span" style="white-space:pre">	</span>delete[] m3;</div>
<div><span class="Apple-tab-span" style="white-space:pre">	</span>return 0;</div>
<div>}
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