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  1. /* Eddy Reconstruction with Exponential Outer Decay Fitting */
  2. /* For Iron Spring PL/I Compiler */
  3.  
  4. EDDY_RECONSTRUCT: PROCEDURE OPTIONS(MAIN);
  5.  
  6.    DCL MAXN     FIXED BIN(31) STATIC INIT(1000);
  7.    DCL X(MAXN), Y(MAXN), VT(MAXN) FLOAT DECIMAL(15);
  8.    DCL N        FIXED BIN(31);
  9.    DCL I        FIXED BIN(31);
  10.    DCL XC, YC   FLOAT DECIMAL(15);
  11.    DCL VT_FIT(MAXN) FLOAT DECIMAL(15);
  12.    DCL LAMBDA   FLOAT DECIMAL(15);
  13.  
  14.    CALL GEN_SAMPLE_DATA(X, Y, VT, N);
  15.  
  16.    XC = 0.0; YC = 0.0;
  17.    CALL FIT_OUTER_EXP(X, Y, VT, N, XC, YC, LAMBDA, VT_FIT);
  18.  
  19.    PUT SKIP LIST('Exponential decay fit λ =', LAMBDA);
  20.    DO I = 1 TO N;
  21.       PUT SKIP EDIT(X(I), Y(I), VT(I), VT_FIT(I)) 
  22.          (F(10,4), X, F(10,4), X, F(10,4), X, F(10,4));
  23.    END;
  24.  
  25. END EDDY_RECONSTRUCT;
  26.  
  27. FIT_OUTER_EXP: PROCEDURE(X, Y, VT, N, XC, YC, LAMBDA, VT_FIT);
  28.    DCL X(*), Y(*), VT(*), VT_FIT(*) FLOAT DECIMAL(15);
  29.    DCL N FIXED BIN(31);
  30.    DCL XC, YC, LAMBDA FLOAT DECIMAL(15);
  31.  
  32.    DCL I FIXED BIN(31);
  33.    DCL DX, DY, R, SUM_R, SUM_LOG FLOAT DECIMAL(15);
  34.  
  35.    SUM_R = 0.0; SUM_LOG = 0.0;
  36.    DO I = 1 TO N;
  37.       DX = X(I) - XC;
  38.       DY = Y(I) - YC;
  39.       R = SQRT(DX*DX + DY*DY);
  40.       IF VT(I) > 0.0 THEN DO;
  41.          SUM_R = SUM_R + R;
  42.          SUM_LOG = SUM_LOG + LOG(VT(I));
  43.       END;
  44.    END;
  45.  
  46.    IF SUM_R > 0.0 THEN
  47.       LAMBDA = -SUM_LOG / SUM_R;
  48.    ELSE
  49.       LAMBDA = 0.0;
  50.  
  51.    DO I = 1 TO N;
  52.       DX = X(I) - XC;
  53.       DY = Y(I) - YC;
  54.       R = SQRT(DX*DX + DY*DY);
  55.       VT_FIT(I) = EXP(-LAMBDA * R);
  56.    END;
  57.  
  58. END FIT_OUTER_EXP;
  59.  
  60. GEN_SAMPLE_DATA: PROCEDURE(X, Y, VT, N);
  61.    DCL X(*), Y(*), VT(*) FLOAT DECIMAL(15);
  62.    DCL N FIXED BIN(31);
  63.  
  64.    DCL I FIXED BIN(31);
  65.  
  66.    N = 10;
  67.    DO I = 1 TO N;
  68.       X(I) = FLOAT(I - 5);
  69.       Y(I) = 0.0;
  70.       VT(I) = EXP(-ABS(X(I)));
  71.    END;
  72.  
  73. END GEN_SAMPLE_DATA;
Success #stdin #stdout 0.01s 5308KB
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https://ideone.com/EJPbB3
language:
Brainf**k (bff 1.0.6)
created:
11 days ago
visibility:
public

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