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jackwqh2010ͳæ (³õÈëÎÄ̳)
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compaq Fortran 6.6 µ÷ÓÃImsL ×Ó³ÌÐòQDAGP
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·¢ÏÖFortran µ÷ÓÃQDAGPʱ£¬²»ÄÜÁ¬Ðøµ÷ÓÃÁ½´Î£¬·ñÔò¾Í±¨´í£¬´úÂëÈçÏ£º INTEGER NOUT, NPTS REAL A, ABS, ALOG, B, ERRABS, ERREST, ERROR, ERRREL, & EXACT, F, POINTS(2), RESULT, SQRT INTRINSIC ABS, ALOG, SQRT EXTERNAL F, QDAGP, UMACH C Get output unit number CALL UMACH (2, NOUT) C Set limits of integration A = 0.0 B = 3.0 C Set error tolerances ERRABS = 0.0 ERRREL = 0.01 C Set singularity parameters NPTS = 2 POINTS(1) = 1.0 POINTS(2) = SQRT(2.0) CALL QDAGP (F, A, B, NPTS, POINTS, ERRABS, ERRREL, RESULT, & ERREST) CALL QDAGP (G, A, B, NPTS, POINTS, ERRABS, ERRREL, RESULT, & ERREST) C Print results EXACT = 61.0*ALOG(2.0) + 77.0/4.0*ALOG(7.0) - 27.0 ERROR = ABS(RESULT-EXACT) c ERROR1 = ABS(RESULT1-EXACT) WRITE (NOUT,99999) RESULT,EXACT, ERREST, ERROR 99999 FORMAT (' Computed =', F8.3, 13X, &' Exact =', F8.3, /, /, & ' Error estimate =', 1PE10.3, 6X, 'Error =', 1PE10.3) C END C REAL FUNCTION F (X) REAL X REAL ABS, ALOG INTRINSIC ABS, ALOG F = X**3*ALOG(ABS((X*X-1.0)*(X*X-2.0))) RETURN END REAL FUNCTION G (X) REAL X REAL ABS, ALOG INTRINSIC ABS, ALOG G = X**3*ALOG(ABS((X*X-1.0)*(X*X-2.0))) RETURN END Çó´óÉñ½â´ðÔÒò,лл£¡ |
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