1Function: matinvmod 2Section: linear_algebra 3C-Name: matinvmod 4Prototype: GG 5Help: matinvmod(x,d): left inverse of the matrix x modulo d. 6Doc: computes a left inverse of the matrix~$x$ modulo~$d$. The matrix $x$ must 7 have \typ{INT} entries, and $d$ can be an arbitrary positive integer. 8 9 \bprog 10 ? A = [3,1,2;1,2,1;3,1,1]; 11 ? U = matinvmod(A,6) 12 %2 = 13 [1 1 3] 14 15 [2 3 5] 16 17 [1 0 5] 18 19 ? (U*A)%6 20 %3 = 21 [1 0 0] 22 23 [0 1 0] 24 25 [0 0 1] 26 ? matinvmod(A,5) 27 *** at top-level: matinvmod(A,5) 28 *** ^-------------- 29 *** matinvmod: impossible inverse in gen_inv: 0. 30 @eprog 31