| 1 | LIB "tst.lib"; tst_init(); |
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| 2 | ring r = (0,A,B,dt,dx,dy),(Tx,Ty,Tt),(c,dp); |
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| 3 | r; |
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| 4 | matrix M[4][4] = |
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| 5 | // direct equation: |
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| 6 | -A^2, -B^2, 1, 0, |
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| 7 | // central difference u_tt |
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| 8 | 0, 0, -dt^2*Tt, (Tt-1)^2, |
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| 9 | // central difference u_xx |
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| 10 | -dx^2*Tx, 0, 0, (Tx-1)^2, |
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| 11 | // central difference u_yy |
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| 12 | 0, -dy^2*Ty, 0, (Ty-1)^2; |
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| 13 | |
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| 14 | print(M); |
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| 15 | |
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| 16 | //========================================= |
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| 17 | // CHECK THE CORRECTNESS OF EQUATIONS AS INPUT: |
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| 18 | ring rX = (0,A,B,dt,dx,dy,Tx,Ty,Tt),(Uxx, Uyy,Utt, U),(c,Dp); |
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| 19 | rX; |
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| 20 | def M = imap(r,M); // T? -> params! // BUG! |
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| 21 | |
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| 22 | print(M); |
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| 23 | |
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| 24 | vector X = [Uxx, Uyy, Utt, U]; |
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| 25 | print(M*X); |
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| 26 | |
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| 27 | // END CHECK |
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| 28 | //========================================= |
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| 29 | tst_status(1);$ |
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| 30 | |
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