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Full Discussion: Assign a particular value to all items in a group that have the same identifier
Top Forums UNIX for Beginners Questions & Answers Assign a particular value to all items in a group that have the same identifier Post 303000469 by Egy on Wednesday 12th of July 2017 04:24:27 PM
Old 07-12-2017
Assign a particular value to all items in a group that have the same identifier
I have a pdb file with the following format:
Code:
ATOM     11  N   PRO A   1      23.223  20.197  14.441  1.00 12.21           N
ATOM     12  CA  PRO A   1      21.881  20.749  14.227  1.00 11.37           C
ATOM     13  C   PRO A   1      21.929  21.556  12.903  1.00 10.73           C
ATOM     14  O   PRO A   1      22.872  22.308  12.668  1.00 12.80           O
ATOM     15  CB  PRO A   1      21.641  21.649  15.437  1.00 10.87           C
ATOM     16  CG  PRO A   1      22.595  21.065  16.473  1.00 11.96           C
ATOM     17  CD  PRO A   1      23.844  20.738  15.680  1.00 12.56           C
ATOM     18  N   GLN A   2      20.920  21.358  12.090  1.00 10.01           N
ATOM     19  CA  GLN A   2      20.848  22.096  10.790  1.00 10.36           C
ATOM     20  C   GLN A   2      20.523  23.577  11.104  1.00  9.48           C
ATOM     21  O   GLN A   2      19.483  23.784  11.751  1.00  9.88           O
ATOM     22  CB  GLN A   2      19.839  21.439   9.860  1.00  9.46           C
ATOM     23  CG  GLN A   2      19.997  22.014   8.451  1.00 10.39           C
ATOM     24  CD  GLN A   2      19.124  21.359   7.433  1.00 11.31           C
ATOM     25  OE1 GLN A   2      18.853  20.153   7.480  1.00 11.96           O
ATOM     26  NE2 GLN A   2      18.609  22.130   6.468  1.00 10.45           N
ATOM     27  N   ALA A   3      21.334  24.475  10.596  1.00  9.29           N
ATOM     28  CA  ALA A   3      21.051  25.904  10.815  1.00  9.15           C
ATOM     29  C   ALA A   3      20.012  26.344   9.800  1.00  9.68           C
ATOM     30  O   ALA A   3      20.253  26.155   8.562  1.00 11.79           O
ATOM     31  CB  ALA A   3      22.339  26.688  10.684  1.00 11.79           C
ATOM     32  N   ILE A   4      18.911  26.884  10.201  1.00  8.39           N
ATOM     33  CA  ILE A   4      17.818  27.322   9.338  1.00  8.72           C
ATOM     34  C   ILE A   4      17.469  28.769   9.682  1.00  8.88           C
ATOM     35  O   ILE A   4      17.202  29.056  10.870  1.00 10.24           O
ATOM     36  CB  ILE A   4      16.576  26.401   9.508  1.00  9.53           C
ATOM     37  CG1 ILE A   4      16.904  24.950   9.073  1.00 10.08           C
ATOM     38  CG2 ILE A   4      15.347  26.971   8.765  1.00 10.36           C
ATOM     39  CD1 ILE A   4      15.720  23.972   9.288  1.00 11.15           C

Between columns 61 to 66 is the value for the B-factor;
between columns 23-26 is the residue number; and
between columns 13-15 is the atom name.

I need to take the B-factor (columns 61-66) for atom CA (columns 13-15) that corresponds to each residue number (columns 23-26), and write that value down in columns 68 to 73 for all rows with the matching residue number.

The pattern always puts CA as the second atom in the group of residues, but the complication is that the number of atoms for each residue varies.

For example, for the data above, I need to have the following output:
Code:
ATOM     11  N   PRO A   1      23.223  20.197  14.441  1.00 12.21 11.37     N    
ATOM     12  CA  PRO A   1      21.881  20.749  14.227  1.00 11.37 11.37     C    
ATOM     13  C   PRO A   1      21.929  21.556  12.903  1.00 10.73 11.37     C    
ATOM     14  O   PRO A   1      22.872  22.308  12.668  1.00 12.80 11.37     O    
ATOM     15  CB  PRO A   1      21.641  21.649  15.437  1.00 10.87 11.37     C    
ATOM     16  CG  PRO A   1      22.595  21.065  16.473  1.00 11.96 11.37     C    
ATOM     17  CD  PRO A   1      23.844  20.738  15.680  1.00 12.56 11.37     C    
ATOM     18  N   GLN A   2      20.920  21.358  12.090  1.00 10.01 10.36     N    
ATOM     19  CA  GLN A   2      20.848  22.096  10.790  1.00 10.36 10.36     C    
ATOM     20  C   GLN A   2      20.523  23.577  11.104  1.00  9.48 10.36     C    
ATOM     21  O   GLN A   2      19.483  23.784  11.751  1.00  9.88 10.36     O    
ATOM     22  CB  GLN A   2      19.839  21.439   9.860  1.00  9.46 10.36     C    
ATOM     23  CG  GLN A   2      19.997  22.014   8.451  1.00 10.39 10.36     C    
ATOM     24  CD  GLN A   2      19.124  21.359   7.433  1.00 11.31 10.36     C    
ATOM     25  OE1 GLN A   2      18.853  20.153   7.480  1.00 11.96 10.36     O    
ATOM     26  NE2 GLN A   2      18.609  22.130   6.468  1.00 10.45 10.36     N    
ATOM     27  N   ALA A   3      21.334  24.475  10.596  1.00  9.29  9.15     N    
ATOM     28  CA  ALA A   3      21.051  25.904  10.815  1.00  9.15  9.15     C    
ATOM     29  C   ALA A   3      20.012  26.344   9.800  1.00  9.68  9.15     C    
ATOM     30  O   ALA A   3      20.253  26.155   8.562  1.00 11.79  9.15     O    
ATOM     31  CB  ALA A   3      22.339  26.688  10.684  1.00 11.79  9.15     C    
ATOM     32  N   ILE A   4      18.911  26.884  10.201  1.00  8.39  8.72     N    
ATOM     33  CA  ILE A   4      17.818  27.322   9.338  1.00  8.72  8.72     C    
ATOM     34  C   ILE A   4      17.469  28.769   9.682  1.00  8.88  8.72     C    
ATOM     35  O   ILE A   4      17.202  29.056  10.870  1.00 10.24  8.72     O    
ATOM     36  CB  ILE A   4      16.576  26.401   9.508  1.00  9.53  8.72     C    
ATOM     37  CG1 ILE A   4      16.904  24.950   9.073  1.00 10.08  8.72     C    
ATOM     38  CG2 ILE A   4      15.347  26.971   8.765  1.00 10.36  8.72     C    
ATOM     39  CD1 ILE A   4      15.720  23.972   9.288  1.00 11.15  8.72     C

Can anyone help me? Very much appreciated for your time.
 

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