5 REM 8X8 MATRIX INVERSION
10 LET N=7
20 DATA 2,3,5,6,7,8,9,3,2,5,4,5,6,7,2,3,4,5,6,2,3,4,5,6
21 DATA 1,2,3,4,6,4,5,2,7,6,4,5,3,4,2,3,2,5,7,8,6,7,8,9
22 DATA 1,4,2,3,5,4,7,6,4,5,7,8,9,34,56,64
30 DIM A(N,N), C(N,N), I(N,N)
40 MAT READ A
50 PRINT "ORIGINAL MATRIX:"
60 MAT PRINT A
70 PRINT
80 MAT C=INV(A)
90 IF DET=0 THEN 200
100 PRINT "DETERMINANT =";DET
110 PRINT
120 PRINT "INVERTED MATRIX:"
130 MAT PRINT C
140 PRINT
150 MAT I=C*A
160 PRINT "PROOF:"
170 MAT PRINT I
180 PRINT
190 STOP
200 PRINT "NO INVERSION POSSIBLE"
300 END

