恒润科技 HiRain Technologies HIRAIN TECHNOLOGIES 提高性能—向量化(省略了fo循环) ■使用循环(多数语言): M=rand(5,10000);=rand(5,10000) W=rand(5,10000);H=rand(5,10000) [rows, cols] size(m) foyT=1:。ws for j 1: col Density(工,J)=M(工,J)/(L(工,J)*W(工,J)*(工,J)); end end ■使用数组操作( MATLAB): Density M./(工.*W.★H); > array vs1o。ps www.hirain.com7 提高性能—向量化（省略了for循环）  使用循环 (多数语言)： M = rand(5,10000); L = rand(5,10000); W = rand(5,10000); H = rand(5,10000); [rows, cols] = size(M); for I = 1:rows for J = 1:cols Density(I,J) = M(I,J)/(L(I,J)*W(I,J)*H(I,J)); end end Density = M./(L.*W.*H); >> array_vs_loops  使用数组操作 (MATLAB)：