topic Re: matrices in SAS/IML Software and Matrix Computations https://communities.sas.com/t5/SAS-IML-Software-and-Matrix/matrices/m-p/140915#M1153 <HTML><HEAD></HEAD><BODY><P>A quick way to add a constant to the diagonal elements of a matrix:</P><P></P><P>/* add B to diagonal of a square matrix A */</P><P>C = A + diag(&nbsp; j(nrow(A),&nbsp; 1,&nbsp;&nbsp; B)&nbsp; );</P></BODY></HTML> Thu, 01 May 2014 19:26:13 GMT Hutch_sas 2014-05-01T19:26:13Z matrices https://communities.sas.com/t5/SAS-IML-Software-and-Matrix/matrices/m-p/140914#M1152 <HTML><HEAD></HEAD><BODY><P style="padding: 0 15px; color: #333333; font-family: Arial, sans-serif;">How would I write a subrountine that takes 2 parameters (a constant and a square matrix). Then adds that constant to the every element of the diagonal of the matrix, and passes the results back in a new parameter?</P><P style="padding: 0 15px; color: #333333; font-family: Arial, sans-serif;">Then out puts the new matrix after the subtracted constant</P><P style="padding: 0 15px; color: #333333; font-family: Arial, sans-serif;">I have the general idea but getting stuck on the diagonal part.</P></BODY></HTML> Thu, 01 May 2014 17:59:18 GMT https://communities.sas.com/t5/SAS-IML-Software-and-Matrix/matrices/m-p/140914#M1152 arbongard 2014-05-01T17:59:18Z Re: matrices https://communities.sas.com/t5/SAS-IML-Software-and-Matrix/matrices/m-p/140915#M1153 <HTML><HEAD></HEAD><BODY><P>A quick way to add a constant to the diagonal elements of a matrix:</P><P></P><P>/* add B to diagonal of a square matrix A */</P><P>C = A + diag(&nbsp; j(nrow(A),&nbsp; 1,&nbsp;&nbsp; B)&nbsp; );</P></BODY></HTML> Thu, 01 May 2014 19:26:13 GMT https://communities.sas.com/t5/SAS-IML-Software-and-Matrix/matrices/m-p/140915#M1153 Hutch_sas 2014-05-01T19:26:13Z