FIX: Incorrect Results Using a COMPLEX Array in a NAMELIST

The information in this article applies to:

• Microsoft FORTRAN for MS-DOS and OS/2, version 5.0

SYMPTOMS

An application that uses a NAMELIST-directed READ statement to initialize an array of COMPLEX values generates incorrect results.

CAUSE

This error occurs when the data in the input file has one element per line.

RESOLUTION

To work around this problem, modify the data in the input file to place the data for all array elements on one line.

STATUS

Microsoft has confirmed this to be a problem in FORTRAN version 5.0 for MS-DOS and OS/2. This problem was corrected in FORTRAN version 5.1 for MS-DOS and OS/2.

MORE INFORMATION

The following code example reads the NAMELIST data file TEST.DAT.

Sample Code

C Compile options needed: None

      COMPLEX MYDATA(5)
      NAMELIST /XX/ MYDATA
      OPEN (1, FILE = 'TEST.DAT')
      READ (1, XX)
      WRITE (*, *) MYDATA
      END

NAMELIST Input File #1

&xx mydata(1) = (1.0, 2.0) mydata(2) = (3.0, 4.0) mydata(3) = (5.0, 6.0) mydata(4) = (7.0, 8.0) mydata(5) = (9.0, 10.0) /

Using NAMELIST Input File #1, the code example produces the following output.

              (1.000000,3.000000)               (5.000000,7.000000)
             (9.000000,10.000000)       (0.000000E+00,0.000000E+00)
      (0.000000E+00,0.000000E+00)

              (1.000000,2.000000)               (3.000000,4.000000)
              (5.000000,6.000000)               (7.000000,8.000000)
             (9.000000,10.000000)

NAMELIST Input File #2

&xx mydata = (1.0, 2.0) (3.0, 4.0) (5.0, 6.0) (7.0, 8.0) (9.0, 10.0) /

Note: A data file can contain repeat factors if the data contains more than one element with the same value. The following input file demonstrates this technique.

NAMELIST Input File #3

&xx mydata = 2*(1.0, 2.0) (3.0, 4.0) (5.0, 6.0) /