☜ | ## $%MTXDET## M[UMPS] by Example | ☞ |

2-Jul–96, 6:54:35 Routine Save for Matrix Mathematics Library function $%MTXDET^MATH ; ; Unless otherwise noted, the code below ; was approved in document X11/96–26 ; ; If corrections have been applied, ; first the original line appears, ; with three semicolons at the beginning of the line. ; ; Then the source of the correction is acknowledged, ; then the corrected line appears, followed by a ; line containing three semicolons. ; MTXDET(A,N) ; ; Compute determinant of matrix A[N,N] IF $DATA(A)<10 QUIT "" IF $GET(N)<1 QUIT "" ; ; First the simple cases ; IF N=1 QUIT $GET(A(1,1)) IF N=2 QUIT $GET(A(1,1))*$GET(A(2,2))-($GET(A(1,2))*$GET(A(2,1))) ; NEW DET,I,SIGN ; ; Det A = sum (k=1:n) element (i,k) * cofactor [i,k] ; SET DET=0,SIGN=1 FOR I=1:1:N DO . SET DET=$GET(A(1,I))*$%MTXCOF^MATH(.A,1,I,N)*SIGN+DET . SET SIGN=-SIGN . QUIT QUIT DET ;=== ; ; ;

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This page most recently updated on 30-Nov-2011, 20:05:30 .

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