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Create an FSGD file

The FSGDF format uses tags to identify information, as shown below (this is just for example, and not something that can be made from the tutorial data):

  Example of a legal file:
  ------------------------- cut here ------------------
  GroupDescriptorFile 1
  Title MyTitle
  Class Class1 plus blue
  Class Class2 circle green
  Variables             Age  Weight   IQ
  Input subjid1 Class1   10    100   1000
  Input subjid2 Class2   20    200   2000
  #Input subjid3 Class2   20    200   2000
  DefaultVariable Age
  ------------------------- cut here ------------------

Notes:

• The first line of the file must be "GroupDescriptorFile 1".

• Title is not necessary. This will be used for display.

• Class only needs the class name, the next two items, if present, will be used in the display.

• The third Input tag will be treated as a comment, due to the # at the beginning of the line.

• DefaultVariable is the default variable for display.

General rules:

• Tags are NOT case sensitive (for instance, 'Class' and 'CLASS' are the same tag).
• Labels are case sensitive (for instance CLASS1 and Class1 are NOT the same label).
• When multiple items appear on a line, they can be separated by any white space (i.e., blank or tab).
• Any line where # appears as the first non-white space character is treated as a comment (ignored).

• The Variables line should appear before the first Input line.

• All Class lines should appear before the first Input line.
• Variable label replications are not allowed.
• Class label replications are not allowed.
• Subject Id replications are not allowed.
• If a class label is not used, a warning is printed out.

• DefaultVariable must be a member of the Variable list.

• No error is generated if a tag does not match.
• Empty lines are OK.
• A class label can optionally be followed by a class marker.

• A class marker can optionally be followed by a class color.