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2. Correct and reorder op code table in BAC-Assembler. 3. Commit tools/BAC-DeckGen.cmd script to generate card deck files from transcription files. 4. Add /Q (quiet mode) switch to BAC-Xscript-Reformatter.wsf, correct problem with output of last card. 5. Commit examples 2, 3, and 4 from BALGOL manual; commit corrections to example 1.
62 lines
1.3 KiB
Plaintext
62 lines
1.3 KiB
Plaintext
2 COMMENT THIRD EXAMPLE PROGRAM FROM BALGOL MANUAL, MARCH 1963.
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2 THE SHORT PROGRAM WHICH FOLLOWS IS FOR A REDUCTION OF A SQUARE MATRIX
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2 TO TRIDIAGONAL FORM, USING THE METHOD OF HOUSEHOLDER;
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2
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2 COMMENT HOUSEHOLDER REDUCTION TO TRIDIAGONAL FORM;
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2 INTEGER I, J, K, L, R, N;
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2 ARRAY A(50,50), X(50), P(50);
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2 INPUT
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2 ELEMENT (I, J, Q);
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2 OUTPUT
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2 AOUT (A(R,R)),
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2 BOUT (-0.5/S);
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2 FORMAT
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2 AF (B10, X10.5, W),
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2 BF (B40, X10.5, W);
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2
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2 N = 5;
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2 IN..
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2 READ (;; ELEMENT);
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2 IF I NEQ 0;
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2 BEGIN
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2 A(I,J) = Q;
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2 GO TO IN
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2 END;
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2
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2 FOR R = (1,1,N-1);
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2 BEGIN
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2 WRITE (;; AOUT, AF);
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2 L = R+1;
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2 S = 0;
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2 FOR J = (L,1,N);
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2 S = S + A(R,J)*2;
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2
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2 S = SIGN(A(R,L))/2SQRT(S);
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2 WRITE (;; BOUT, BF);
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2 X(L) = SQRT(0.5 + A(R,L).S);
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2 S = S/X(L);
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2 FOR J = (R+2,1,N);
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2 X(J) = S.A(R,J);
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2 FOR J = (R,1,N);
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2 BEGIN
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2 S = 0;
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2 FOR K = (L,1,N);
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2 S = S + A(MIN(J,K), MAX(J,K)).X(K);
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2 P(J) = S
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2 END;
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2
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2 S = 0;
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2 FOR J = (L,1,N);
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2 S = S + K(J).P(J);
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2 FOR J = (L,1,N);
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2 P(J) = P(J) - S.X(J);
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2 FOR J = (L,1,N);
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2 FOR K = (J,1,N);
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2 A(J,K) = A(J,K) - 2(X(J).P(K) + X(K).P(J))
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2 END;
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2
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2 WRITE (;; AOUT, AF);
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2 STOP;
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2 GO TO IN;
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2 FINISH;
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