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Match.c

/* 
A* -------------------------------------------------------------------
B* This file contains source code for the PyMOL computer program
C* Copyright (c) Schrodinger, LLC. 
D* -------------------------------------------------------------------
E* It is unlawful to modify or remove this copyright notice.
F* -------------------------------------------------------------------
G* Please see the accompanying LICENSE file for further information. 
H* -------------------------------------------------------------------
I* Additional authors of this source file include:
-* 
-* 
-*
Z* -------------------------------------------------------------------
*/

#include"os_predef.h"
#include"os_limits.h"
#include"os_std.h"

#include"Base.h"
#include"MemoryDebug.h"
#include"OOMac.h"
#include"Match.h"
#include"Util.h"
#include"Feedback.h"
#include"Parse.h"

#ifndef int2
typedef int int2[2];
#endif

CMatch *MatchNew(PyMOLGlobals * G, unsigned int na, unsigned int nb, int dist_mats)
{
  unsigned int dim[2];
  OOCalloc(G, CMatch);

  I->na = na;
  I->nb = nb;

  dim[0] = na;
  dim[1] = nb;
  I->G = G;
  if(na && nb) {
    I->mat = (float **) UtilArrayCalloc(dim, 2, sizeof(float));
  }

  if(dist_mats && na) {
    dim[0] = na + 1;
    dim[1] = na + 1;
    I->da = (float **) UtilArrayCalloc(dim, 2, sizeof(float));
  }
  if(dist_mats && nb) {
    dim[0] = nb + 1;
    dim[1] = nb + 1;
    I->db = (float **) UtilArrayCalloc(dim, 2, sizeof(float));
  }

  /* scoring matrix is always 128^2 */
  dim[0] = dim[1] = 128;
  I->smat = (float **) UtilArrayCalloc(dim, 2, sizeof(float));

  {
    /* lay down an 10/-1 identity matrix to cover matches for known
       residues other than amino acids (dna, rna, as 1,2,3,4 etc.)
       these values will be overwritten by the matrix */

    int i,j;
    
    for(i=0;i<dim[0];i++) {
      for(j=0;j<dim[1];j++) {
        I->smat[i][j] = -1.0F; 
      }
    }

    for(i=0;i<dim[0];i++) {
      I->smat[i][i] = 10.0F; /* these values will be overwritten by BLOSUM, etc. */
    }

  }

  if(!(I->mat && I->smat && ((!dist_mats) || (I->da && I->db)))) {
    MatchFree(I);
    I = NULL;
  }
  return (I);
}

int MatchResidueToCode(CMatch * I, int *vla, int n)
{

#define cNRES 39
  PyMOLGlobals *G = I->G;
  int ok = true;
  int a, b, c;
  int found;
  int rcode[cNRES], rname[cNRES];
  int *trg;
  char res[][4] = {

    /* IF YOU ADD HERE, BE SURE TO UPDATE cNRES above!!! */

    /* using numbers to prevent nucleic acids from getting confounded with
       protein scores */

    "A", "1", 
    "DA", "1",
    "ADE", "1",

    "C", "2",
    "DC", "2",
    "CYT", "2",

    "G", "3",
    "DG", "3",
    "GUA", "3",

    "T", "4",
    "DT", "4",
    "THY", "4",

    "U", "4",
    "URA", "4",

    /* these should correspond to the matrix being read */

    "ALA", "A",
    "CYS", "C",
    "ASP", "D",
    "GLU", "E",
    "PHE", "F",

    "GLY", "G",
    "HIS", "H",
    "ILE", "I",
    "LYS", "K",
    "LEU", "L",

    "MET", "M",
    "MSE", "M",                 /* selenomet */

    "ASN", "N",
    "PRO", "P",
    "GLN", "Q",
    "ARG", "R",

    "SER", "S",
    "SEP", "S",                 /* phosphoserine */
    "THR", "T",
    "TPO", "T",                 /* phosphothreonine */
    "VAL", "V",

    "TRP", "W",
    "TYR", "Y",
    "PTR", "Y",                 /* phosphotyrosine */
    "TYS", "Y"                  /* sulfotyrosine */
  };

  /* get integral values for the residue names */

  for(a = 0; a < cNRES; a++) {
    b = 0;
    for(c = 0; c < 3; c++) {
      b = (b << 8) | res[a * 2][c];
    }
    rname[a] = b;
    rcode[a] = res[a * 2 + 1][0];
  }

  for(b = 0; b < n; b++) {
    found = 0;
    trg = vla + (b * 3) + 2;
    for(a = 0; a < cNRES; a++)
      if(rname[a] == *trg) {
        found = true;
        *trg = rcode[a];
        break;
      }
    if(!found) {
      if(*trg != 0x484f48) {    /* HOH */
        char st[4];
        st[0] = 0xFF & (*trg >> 16);
        st[1] = 0xFF & (*trg >> 8);
        st[2] = 0xFF & *trg;
        st[3] = 0;
        PRINTFB(G, FB_Match, FB_Warnings)
          " Match-Warning: unknown residue type '%s' (using X).\n", st ENDFB(G);
      }
      *trg = 'X';
    }
  }
  return (ok);
}

int MatchPreScore(CMatch * I, int *vla1, int n1, int *vla2, int n2, int quiet)
{
  PyMOLGlobals *G = I->G;
  int a, b;
  if(!quiet) {
    PRINTFB(G, FB_Match, FB_Details)
      " Match: assigning %d x %d pairwise scores.\n", n1, n2 ENDFB(G);
  }

  for(a = 0; a < n1; a++) {
    for(b = 0; b < n2; b++) {
      I->mat[a][b] = I->smat[0x7F & vla1[a * 3 + 2]][0x7F & vla2[b * 3 + 2]];
      /*      printf("%d %d %c %c %8.1f\n",a,b,0x7F & vla1[a * 3 + 2], 0x7F & vla2[b * 3 + 2], 
              I->smat[0x7F & vla1[a * 3 + 2]][0x7F & vla2[b * 3 + 2]]);*/
    }
  }
  return 1;
}

#define BLOSUM62_ROWS 33
#define BLOSUM62_COLS 80

static char blosum62[BLOSUM62_ROWS][BLOSUM62_COLS] = {
  "#  Matrix made by matblas from blosum62.iij\n",
  "#  * column uses minimum score\n",
  "#  BLOSUM Clustered Scoring Matrix in 1/2 Bit Units\n",
  "#  Blocks Database = /data/blocks_5.0/blocks.dat\n",
  "#  Cluster Percentage: >= 62\n",
  "#  Entropy =   0.6979, Expected =  -0.5209\n",
  "   A  R  N  D  C  Q  E  G  H  I  L  K  M  F  P  S  T  W  Y  V  B  Z  X  *\n",
  "A  4 -1 -2 -2  0 -1 -1  0 -2 -1 -1 -1 -1 -2 -1  1  0 -3 -2  0 -2 -1  0 -4\n",
  "R -1  5  0 -2 -3  1  0 -2  0 -3 -2  2 -1 -3 -2 -1 -1 -3 -2 -3 -1  0 -1 -4\n",
  "N -2  0  6  1 -3  0  0  0  1 -3 -3  0 -2 -3 -2  1  0 -4 -2 -3  3  0 -1 -4\n",
  "D -2 -2  1  6 -3  0  2 -1 -1 -3 -4 -1 -3 -3 -1  0 -1 -4 -3 -3  4  1 -1 -4\n",
  "C  0 -3 -3 -3  9 -3 -4 -3 -3 -1 -1 -3 -1 -2 -3 -1 -1 -2 -2 -1 -3 -3 -2 -4\n",
  "Q -1  1  0  0 -3  5  2 -2  0 -3 -2  1  0 -3 -1  0 -1 -2 -1 -2  0  3 -1 -4\n",
  "E -1  0  0  2 -4  2  5 -2  0 -3 -3  1 -2 -3 -1  0 -1 -3 -2 -2  1  4 -1 -4\n",
  "G  0 -2  0 -1 -3 -2 -2  6 -2 -4 -4 -2 -3 -3 -2  0 -2 -2 -3 -3 -1 -2 -1 -4\n",
  "H -2  0  1 -1 -3  0  0 -2  8 -3 -3 -1 -2 -1 -2 -1 -2 -2  2 -3  0  0 -1 -4\n",
  "I -1 -3 -3 -3 -1 -3 -3 -4 -3  4  2 -3  1  0 -3 -2 -1 -3 -1  3 -3 -3 -1 -4\n",
  "L -1 -2 -3 -4 -1 -2 -3 -4 -3  2  4 -2  2  0 -3 -2 -1 -2 -1  1 -4 -3 -1 -4\n",
  "K -1  2  0 -1 -3  1  1 -2 -1 -3 -2  5 -1 -3 -1  0 -1 -3 -2 -2  0  1 -1 -4\n",
  "M -1 -1 -2 -3 -1  0 -2 -3 -2  1  2 -1  5  0 -2 -1 -1 -1 -1  1 -3 -1 -1 -4\n",
  "F -2 -3 -3 -3 -2 -3 -3 -3 -1  0  0 -3  0  6 -4 -2 -2  1  3 -1 -3 -3 -1 -4\n",
  "P -1 -2 -2 -1 -3 -1 -1 -2 -2 -3 -3 -1 -2 -4  7 -1 -1 -4 -3 -2 -2 -1 -2 -4\n",
  "S  1 -1  1  0 -1  0  0  0 -1 -2 -2  0 -1 -2 -1  4  1 -3 -2 -2  0  0  0 -4\n",
  "T  0 -1  0 -1 -1 -1 -1 -2 -2 -1 -1 -1 -1 -2 -1  1  5 -2 -2  0 -1 -1  0 -4\n",
  "W -3 -3 -4 -4 -2 -2 -3 -2 -2 -3 -2 -3 -1  1 -4 -3 -2 11  2 -3 -4 -3 -2 -4\n",
  "Y -2 -2 -2 -3 -2 -1 -2 -3  2 -1 -1 -2 -1  3 -3 -2 -2  2  7 -1 -3 -2 -1 -4\n",
  "V  0 -3 -3 -3 -1 -2 -2 -3 -3  3  1 -2  1 -1 -2 -2  0 -3 -1  4 -3 -2 -1 -4\n",
  "B -2 -1  3  4 -3  0  1 -1  0 -3 -4  0 -3 -3 -2  0 -1 -4 -3 -3  4  1 -1 -4\n",
  "Z -1  0  0  1 -3  3  4 -2  0 -3 -3  1 -1 -3 -1  0 -1 -3 -2 -2  1  4 -1 -4\n",
  "X  0 -1 -1 -1 -2 -1 -1 -1 -1 -1 -1 -1 -1 -1 -2  0  0 -2 -1 -1 -1 -1 -1 -4\n",
  "* -4 -4 -4 -4 -4 -4 -4 -4 -4 -4 -4 -4 -4 -4 -4 -4 -4 -4 -4 -4 -4 -4 -4  1\n",
  ""
};

int MatchMatrixFromFile(CMatch * I, char *fname, int quiet)
{
  PyMOLGlobals *G = I->G;

  int ok = 1;
  FILE *f;
  char *buffer = NULL;
  char *p;
  char cc[255];
  char *code = NULL;
  unsigned int x, y;
  int a;
  int n_entry;
  unsigned int size;

  if(fname && fname[0]
#ifdef _PYMOL_NOPY
     /* if Python is absent, then use the hardcoded copy of BLOSUM62 */
     && !(strcmp(fname, "BLOSUM62") == 0)
#endif
    ) {
    f = fopen(fname, "rb");
    if(!f) {
      PRINTFB(G, FB_Match, FB_Errors)
        " Match-Error: unable to open matrix file '%s'.\n", fname ENDFB(G);
      ok = false;
    } else {
      fseek(f, 0, SEEK_END);
      size = ftell(f);
      fseek(f, 0, SEEK_SET);

      buffer = (char *) mmalloc(size + 255);
      ErrChkPtr(G, buffer);
      p = buffer;
      fseek(f, 0, SEEK_SET);
      fread(p, size, 1, f);
      p[size] = 0;
      fclose(f);
    }
  } else {
    buffer = Alloc(char, BLOSUM62_ROWS * BLOSUM62_COLS);
    if(buffer) {
      p = buffer;
      a = 0;
      while(blosum62[a][0]) {
        strcpy(p, &blosum62[a][0]);
        p += strlen(p);
        a++;
      }
    } else {
      ok = false;
    }
  }

  if(ok && buffer) {

    /* count codes */

    p = buffer;
    n_entry = 0;
    while(*p && ok) {
      switch (*p) {
      case '#':
        break;
      default:
        if((*p) > 32)
          n_entry++;
        break;
      }
      p = ParseNextLine(p);
    }

    if(!n_entry)
      ok = false;
    else {
      code = (char *) Calloc(int, n_entry);

      /* read codes */

      p = buffer;
      n_entry = 0;
      while(*p && ok) {
        switch (*p) {
        case '#':
          break;
        default:
          if((*p) > 32) {
            code[n_entry] = *p;
            n_entry++;
          }
          break;
        }
        p = ParseNextLine(p);
      }

      /* read values */

      p = buffer;
      while((*p) && ok) {
        switch (*p) {
        case '#':
          break;
        default:
          if((*p) > 32) {
            x = *(p++);
            for(a = 0; a < n_entry; a++) {
              p = ParseWordCopy(cc, p, 255);
              y = (unsigned int) code[a];
              ok = sscanf(cc, "%f", &I->smat[x][y]);
            }
          }
          break;
        }
        if(!ok)
          break;
        p = ParseNextLine(p);
      }
    }
    mfree(buffer);
  }
  if(ok) {
    if(!quiet) {
      PRINTFB(G, FB_Match, FB_Details)
        " Match: read scoring matrix.\n" ENDFB(G);
    }
  }
  FreeP(code);
  return (ok);
}

int MatchAlign(CMatch * I, float gap_penalty, float ext_penalty,
               int max_gap, int max_skip, int quiet, int window, float ante)
{
  PyMOLGlobals *G = I->G;
  register int a, b, f, g;
  register int nf, ng;
  register int sf, sg;
  register float **score;
  register float **da, **db;
  register int na = I->na, nb = I->nb;
  unsigned int dim[2];
  register int2 **point;
  float mxv;
  int mxa, mxb;
  float tst = 0.0;
  register int gap = 0;
  int *p;
  int cnt;
  int ok = true;
  const float MIN_SCORE = 0.0F;
  nf = na + 1;
  ng = nb + 1;
  da = I->da;
  db = I->db;
  if(!quiet) {
    PRINTFB(G, FB_Match, FB_Actions)
      " MatchAlign: aligning residues (%d vs %d)...\n", na, nb ENDFB(G);
  }

  dim[0] = nf;
  dim[1] = ng;
  VLAFreeP(I->pair);
  score = (float **) UtilArrayCalloc(dim, 2, sizeof(float));
  point = (int2 **) UtilArrayCalloc(dim, 2, sizeof(int2));
  if(score && point) {

    /* initialize the scoring matrix */
    for(f = 0; f < nf; f++) {
      for(g = 0; g < ng; g++) {
        score[f][g] = MIN_SCORE;
        point[f][g][0] = -1;
        point[f][g][1] = -1;
      }
    }
    /* now start walking backwards up the alignment */
    {
      int second_pass = false;
      for(b = nb - 1; b >= 0; b--) {
        for(a = na - 1; a >= 0; a--) {
          /* find the maximum scoring cell accessible from this position, 
           * while taking gap penalties into account */

          mxv = MIN_SCORE;
          mxa = -1;
          mxb = -1;

          /* search for asymmetric insertions and deletions */
          f = a + 1;
          if((max_gap >= 0) && (second_pass)) {
            sf = a + 2 + max_gap;
            sg = b + 2 + max_gap;
            if(sg > ng)
              sg = ng;
            if(sf > nf)
              sf = nf;
          } else {
            sg = ng;
            sf = nf;
          }
          for(g = b + 1; g < sg; g++) {
            tst = score[f][g];

            if(window) {
              register int aa = a, bb = b, ff = f, gg = g, cc;
              tst += ante;
              for(cc = 0; cc < window; cc++) {
                if((ff >= 0) && (gg >= 0) && (ff < na) && (gg < nb)) {
                  tst -= (float) fabs(da[a][ff] - db[b][gg]);
                  aa = ff;
                  bb = gg;
                  ff = point[aa][bb][0];
                  gg = point[aa][bb][1];
                } else
                  break;
              }
            }

            if(!((f == na) || (g == nb))) {
              gap = g - (b + 1);
              if(gap)
                tst += gap_penalty + ext_penalty * (gap - 1);
            }
            if(tst > mxv) {
              mxv = tst;
              mxa = f;
              mxb = g;
            }
          }
          g = b + 1;

          for(f = a + 1; f < sf; f++) {
            tst = score[f][g];

            if(window) {
              register int aa = a, bb = b, ff = f, gg = g, cc;
              tst += ante;
              for(cc = 0; cc < window; cc++) {
                if((ff >= 0) && (gg >= 0) && (ff < na) && (gg < nb)) {
                  tst -= (float) fabs(da[a][ff] - db[b][gg]);
                  aa = ff;
                  bb = gg;
                  ff = point[aa][bb][0];
                  gg = point[aa][bb][1];
                } else
                  break;
              }
            }

            if(!((f == na) || (g == nb))) {
              gap = (f - (a + 1));
              if(gap)
                tst += gap_penalty + ext_penalty * (gap - 1);
            }
            if(tst > mxv) {
              mxv = tst;
              mxa = f;
              mxb = g;
            }
          }

          if(max_skip) {
            /* search for high scoring mismatched stretches */

            sf = a + 1 + max_skip;
            sg = b + 1 + max_skip;
            if(sf > nf)
              sf = nf;
            if(sg > ng)
              sg = ng;

            for(f = a + 1; f < sf; f++) {
              for(g = b + 1; g < sg; g++) {
                tst = score[f][g];

                if(window) {
                  register int aa = a, bb = b, ff = f, gg = g, cc;
                  tst += ante;
                  for(cc = 0; cc < window; cc++) {
                    if((ff >= 0) && (gg >= 0) && (ff < na) && (gg < nb)) {
                      tst -= (float) fabs(da[a][ff] - db[b][gg]);
                      aa = ff;
                      bb = gg;
                      ff = point[aa][bb][0];
                      gg = point[aa][bb][1];
                    } else
                      break;
                  }
                }

                /* only penalize if we are not at the end */
                if(!((f == na) || (g == nb))) {
                  gap = ((f - (a + 1)) + (g - (b + 1)));
                  if(gap > 1)
                    tst += 2 * gap_penalty + ext_penalty * (gap - 2);
                }
              }
              if(tst > mxv) {
                mxv = tst;
                mxa = f;
                mxb = g;
              }
            }
          }

          /* store what the best next step is */

          point[a][b][0] = mxa;
          point[a][b][1] = mxb;

          /* and store the cumulative score for this cell */
          score[a][b] = mxv + I->mat[a][b];

          second_pass = true;
        }
      }
    }

    if(Feedback(G, FB_Match, FB_Debugging)) {
      for(b = 0; b < nb; b++) {
        for(a = 0; a < na; a++) {
          printf("%4.1f(%2d,%2d)", score[a][b], point[a][b][0], point[a][b][1]);
        }
        printf("\n");
      }
    }

    /* find the best entry point */

    mxv = MIN_SCORE;
    mxa = 0;
    mxb = 0;
    for(b = 0; b < nb; b++) {
      for(a = 0; a < na; a++) {
        tst = score[a][b];
        if(tst > mxv) {
          mxv = tst;
          mxa = a;
          mxb = b;
        }
      }
    }
    I->pair = VLAlloc(int, 2 * (na > nb ? na : nb));
    p = I->pair;
    a = mxa;
    b = mxb;
    cnt = 0;
    while((a >= 0) && (b >= 0) && (a < na) && (b < nb)) {
      *(p++) = a;
      *(p++) = b;
      f = point[a][b][0];
      g = point[a][b][1];
      a = f;
      b = g;
      cnt++;
    }
    PRINTFD(G, FB_Match)
      " MatchAlign-DEBUG: best entry %8.3f %d %d %d\n", mxv, mxa, mxb, cnt ENDFD;
    if(!quiet) {
      PRINTFB(G, FB_Match, FB_Results)
        " MatchAlign: score %1.3f\n", mxv ENDFD;
    }
    I->score = mxv;
    I->n_pair = cnt;
    VLASize(I->pair, int, (p - I->pair));
    FreeP(score);
    FreeP(point);
  }
  return (ok);
}

#if 0
int MatchAlign(CMatch * I, float gap_penalty, float ext_penalty,
               int max_gap, int max_skip, int quiet)
{
  PyMOLGlobals *G = I->G;
  unsigned int dim[2];
  register int a, b, f, g;
  register int nf, ng;
  register int sf, sg;
  register float **score;
  register int na = I->na, nb = I->nb;
  register int2 **point;
  float mxv;
  int mxa, mxb;
  float tst = 0.0;
  register int gap = 0;
  int *p;
  int cnt;
  int ok = true;
  const float MIN_SCORE = 0.0F;
  nf = na + 1;
  ng = nb + 1;

  if(!quiet) {
    PRINTFB(G, FB_Match, FB_Actions)
      " MatchAlign: aligning residues (%d vs %d)...\n", na, nb ENDFB(G);
  }

  dim[0] = nf;
  dim[1] = ng;
  VLAFreeP(I->pair);
  score = (float **) UtilArrayCalloc(dim, 2, sizeof(float));
  point = (int2 **) UtilArrayCalloc(dim, 2, sizeof(int2));
  if(score && point) {

    /* initialize the scoring matrix */
    for(f = 0; f < nf; f++) {
      for(g = 0; g < ng; g++) {
        score[f][g] = MIN_SCORE;
        point[f][g][0] = -1;
        point[f][g][1] = -1;
      }
    }
    /* now start walking backwards up the alignment */

    {
      int second_pass = false;
      for(b = nb - 1; b >= 0; b--) {
        for(a = na - 1; a >= 0; a--) {

          /* find the maximum scoring cell accessible from this position, 
           * while taking gap penalties into account */

          mxv = MIN_SCORE;
          mxa = -1;
          mxb = -1;

          /* search for asymmetric insertions and deletions */
          f = a + 1;
          if((max_gap >= 0) && (second_pass)) {
            sf = a + 2 + max_gap;
            sg = b + 2 + max_gap;
            if(sg > ng)
              sg = ng;
            if(sf > nf)
              sf = nf;
          } else {
            sg = ng;
            sf = nf;
          }
          for(g = b + 1; g < sg; g++) {
            tst = score[f][g];
            if(!((f == na) || (g == nb))) {
              gap = g - (b + 1);
              if(gap)
                tst += gap_penalty + ext_penalty * (gap - 1);
            }
            if(tst > mxv) {
              mxv = tst;
              mxa = f;
              mxb = g;
            }
          }
          g = b + 1;

          for(f = a + 1; f < sf; f++) {
            tst = score[f][g];
            if(!((f == na) || (g == nb))) {
              gap = (f - (a + 1));
              if(gap)
                tst += gap_penalty + ext_penalty * (gap - 1);
            }
            if(tst > mxv) {
              mxv = tst;
              mxa = f;
              mxb = g;
            }
          }

          if(max_skip) {
            /* search for high scoring mismatched stretches */

            sf = a + 1 + max_skip;
            sg = b + 1 + max_skip;
            if(sf > nf)
              sf = nf;
            if(sg > ng)
              sg = ng;

            for(f = a + 1; f < sf; f++) {
              for(g = b + 1; g < sg; g++) {
                tst = score[f][g];
                /* only penalize if we are not at the end */
                if(!((f == na) || (g == nb))) {
                  gap = ((f - (a + 1)) + (g - (b + 1)));
                  if(gap > 1)
                    tst += 2 * gap_penalty + ext_penalty * (gap - 2);
                }
              }
              if(tst > mxv) {
                mxv = tst;
                mxa = f;
                mxb = g;
              }
            }
          }

          /* store what the best next step is */

          point[a][b][0] = mxa;
          point[a][b][1] = mxb;

          /* and store the cumulative score for this cell */
          score[a][b] = mxv + I->mat[a][b];

          second_pass = true;
        }
      }
    }

    if(Feedback(G, FB_Match, FB_Debugging)) {
      for(b = 0; b < nb; b++) {
        for(a = 0; a < na; a++) {
          printf("%4.1f(%2d,%2d)", score[a][b], point[a][b][0], point[a][b][1]);
        }
        printf("\n");
      }
    }

    /* find the best entry point */

    mxv = MIN_SCORE;
    mxa = 0;
    mxb = 0;
    for(b = 0; b < nb; b++) {
      for(a = 0; a < na; a++) {
        tst = score[a][b];
        if(tst > mxv) {
          mxv = tst;
          mxa = a;
          mxb = b;
        }
      }
    }
    I->pair = VLAlloc(int, 2 * (na > nb ? na : nb));
    p = I->pair;
    a = mxa;
    b = mxb;
    cnt = 0;
    while((a >= 0) && (b >= 0) && (a < na) && (b < nb)) {
      *(p++) = a;
      *(p++) = b;
      f = point[a][b][0];
      g = point[a][b][1];
      a = f;
      b = g;
      cnt++;
    }
    PRINTFD(G, FB_Match)
      " MatchAlign-DEBUG: best entry %8.3f %d %d %d\n", mxv, mxa, mxb, cnt ENDFD;
    if(!quiet) {
      PRINTFB(G, FB_Match, FB_Results)
        " MatchAlign: score %1.3f\n", mxv ENDFD;
    }
    I->score = mxv;
    I->n_pair = cnt;
    VLASize(I->pair, int, (p - I->pair));
    FreeP(score);
    FreeP(point);
  }
  return (ok);
}
#endif

void MatchFree(CMatch * I)
{
  FreeP(I->da);
  FreeP(I->db);
  FreeP(I->mat);
  FreeP(I->smat);
  VLAFreeP(I->pair);
  OOFreeP(I);
}

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