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MathGroup Archive 1994

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Using Read List to read FORTRAN output

  • To: mathgroup at yoda.physics.unc.edu
  • Subject: Using Read List to read FORTRAN output
  • From: Cetin Cetinkaya <cetin at acm0.me.uiuc.edu>
  • Date: Tue, 11 Jan 1994 00:32:08 -0600

                                       Tue Jan 11 00:29:29 CST 1994


Dear Netters;

I have a quick question. I have an input file which looks like as
follows: 


 Elem. No.                        S22                                           
 ---------   -------------------------------------------------------            
     1       Int. pt.  1 : -1.9419E+04   Int. pt.  2 : -3963.7                  
             Int. pt.  3 : -1.1481E+04   Int. pt.  4 :  3973.9                  
     3       Int. pt.  1 :   882.7       Int. pt.  2 :  3285.4  
             Int. pt.  3 :  5379.9       Int. pt.  4 :  7782.6                  



I am interested in reading this data file (test3.m) into MMA in a list form.
For this file, what I want is something like this:

{1, -1.9419E+04,   -3963.7  ,   -1.1481E+04 ,  3973.9 ,
 2,    882.7   ,    3285.4  ,     5379.9    ,  7782.6  } 

that is to say, I want Elem. No. and corresponding four Int. pt. values.
To do this, I have studied the section 2.10. Reading Data of the Manual.

In In[79] below, I have shown the function which I developed
for this purpose. Unfortunately, it does not give what it is suppposed
to produce: Elem. No.'s are missing.
                                          
In[79]:=ReadList["test3.m",Record ,
RecordSeparators->{{"/n ","1 :","2 :","3 :","4 :"},
                   {"Int. pt.  1 :","Int","Int","Int","\n"}}
        ]

Out[79]= { -1.9419E+04   ,  -3963.7                  ,  -1.1481E+04   , 
 
>      3973.9                  ,    882.7       ,   3285.4  }


The manual suggests (In13] in p.497) that InputForm of a ReadList command is
helpful. The following is the InputForm - how MMA sees it internally:
                                                             
  In[80]:= InputForm[   ReadList["test3.m",Record ,RecordSeparators->{}]]
0.0166667 Second  669.724 KByte

Out[80]//InputForm= 
  {" Elem. No.                        S22                                    \
          \n ---------  \
    -------------------------------------------------------            \n    \
    1       Int. pt.  1 : -1.9419E+04   Int. pt.  2 : -3963.7                \
     \n             Int. pt.  3 : -1.1481E+04   Int. pt.  4 :  3973.9        \
             \n     3       Int. pt.  1 :   882.7       Int. pt.  2 :  3285.4\
     \n"}
                                                                            


>From Out[80], it is clear that Elem. No.'s 1 and 3 are  between "\n" and "Int. pt.  1 :".
But it is not given in the output line Out[79] above even though the right separator
is used in the function.

Now I would like to ask the following questions:      
1- How come MMA do not recognize this separator?
2- What can I improve my function for the desired task?
3- Is there a better way to do what I am trying to do? Something similar to
   FORTRAN formats?


Thanks in advance,
               
CETIN CETINKAYA






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