5 REM 4X4 MATRIX INVERSION
10 LET N=3
20 DATA 1,0,0,1,0,1,0,1,0,100,1,1,1,0,1,0
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

