Recent content by Jes1x1

Thank you, Chiro! You are very enthusiastic and very nice. I own you a lot. I will try your hints. Hopefully I can gain the results. Then I will ask you late. Sincerely yours

Dear folks! Please help me. I need solve this problem. Thank you very much Sincerely yours!

Dear Chiro, Thank for your help. But I am sorry, because I do not think that there is any zero determinant. The inverse of A is always in this form [v 0 0 0 0] [k t 0 0 0] [s u t 0 0] [m p u t 0] [w q p u t] I focus on calculating the elements in the first 2 columns. Then I...

Dear Chiro. Please help me. I have programmed but it is not faster, even if it is slower than my algorithm. My code is: IdenMatrix=IdentityMatrix[n]; t=Det[MyLowerTriangularMatrix]; For[k=1,k<=n,k++, A1B=ReplacePart[MyLowerTriangularMatrix,{i_,k} -> IdenMatrix[[i,1]]]...

My code is A.X=I (A is Lower Triangular Matrix as I mentioned above, X is Inverse of A, and we must find X, I is Identity Matrix corresponding). (* Find elements of the first and the second columns*) X[[1,1]]=1/A[[1,1]]; X[[2,2]]=1/A[[2,2]]; X[[2,1]]=-(A[[2,1]]*X[[1,1]]/A[[2,2]])...

Thank for your help. I know I can not make a code which is better than professionals who make mathematica's function. Because my Lower Triangular Matrix is very very special (it has first 2 columns is different.) so I think that I can do something better than LinearSolve. I will try...

Dear folks! Please help me in this problem. It is very important to me. Thanks so much Sincerely yours

Dear Chiro. Please help me. I have programmed but it is not faster, even if it is slower than my algorithm. My code is: IdenMatrix=IdentityMatrix[n]; t=Det[MyLowerTriangularMatrix]; For[k=1,k<=n,k++, A1B=ReplacePart[MyLowerTriangularMatrix,{i_,k} -> IdenMatrix[[i,1]]]...

Thank you very much. I really thank you. I will try coding. Hopefully, I will get the results. I only care about the Run time compare with LinearSolve. You are very nice and enthusiastic. I own you. Thank you I hope I can solve this problem. Sincerely yours.

Thanks for your help. I know it is difficult. But I must do it. Anyway, I am grateful you. Thank you. Sincerely yours

Thanks for your help. Could you tell me more detail about your ideas. My matrix is very special. Thanks very much Sincerely yours

Thanks for your answer. You are very nice and enthusiastic. In fact, my matrix quite special. It is a Lower Triangular Matrix which has its first 2 columns is different. Others elements in the remain columns (columns 3 to n) have the same elements with the elements in second columns. [a 0 0 0...

Dear folks! Please help me this problem. I want to calculate inverse of lower triangular matrix in a fastest way. I use Mathematica and function LinearSolve. It did well. But because the matrix is lower triangular matrix. It is very special. So, I want to make a function called...