WIP Version 1.6 Changes

This version reflects corrections and enhancements to WIP (Version 1.6):
  1. The command STRING has changed its meaning. Before version 1.6, STRING set the string variable to the rest of the string. As of version 1.6, there are two methods of setting the value of string variable: using the SET and STRING commands. The SET command sets the string to the rest of the of the command line (like the old STRING command did) and the STRING command read N words from an external file (with a possible starting offset).
  2. The commands NEW and FREE have been modified to allow string variables to be defined and released. The syntax for creating a string variable is enclose the string variable in double quotes (") when declaring it in the NEW command. String variables defined this way and used in other commands (including FREE) do not need the quotes. For example, the following
           WIP> new "mystring"
           WIP> set mystring some sort of text
           WIP> echo "mystring = " mystring
           WIP> free mystring
         
    are legal commands.
  3. The command FIT has been added. Currently, there are two methods of fitting the data read by the XCOLUMN and YCOLUMN commands: the least squares and median fit methods. The parameters returned from the fit may be assigned to user specified user variables.
  4. The commands AITOFF and GLOBE have been added. The command AITOFF converts longitude (X) and latitude (Y) values into coordinates useful in Aitoff projections. The GLOBE command draws a grid outline of an Aitoff globe.
  5. A new command INITIALIZE permits vector variables to be reset to a new value and (filled) size. Setting the fill size to 0 effectively empties the vector array.
  6. The IF command was modified to permit the LOOP command to be executed following a truthful condition.
  7. The POINTS command was modified to allow the values from the most recent call to PCOLUMN to determine the color of each point.
  8. A histogram routine was added as an option to the BIN command which permits gaps and reverses in the data to be avoided (MCHW).
  9. The command WEDGE was corrected so the user can specify a minimum or maximum that agrees with the halftone command. In addition, the overall minimum and maximum may be set to some other value than the current image's minimum and maximum.
  10. All references (except within #ifdef TEST code) to exit() have been replaced by a call to wipexit(). Now all terminal I/O resides within sysdep*/inoutput.c.
  11. A new breed of function has been added: vector argument functions. This function type requires a vector variable name as its only argument and acts on the entire variable. Currently, the only function is npts() which returns the number of points currently defined in the vector.
  12. Routine wippackint() was modified to allow string variables to be expanded as well as user variables.
  13. The subdirectory /variables has been modified considerably. This was done to break up the user, vectors, and string variables into individual routines. This also involved a split of the respective include files. This should make the individual items more compartmental (i.e. C++-like). This also includes the removal of the file wipvarinit.c as it is no longer needed (initialization of each type of variable is done whenever a type is accessed for the first time).
  14. Changed many of the routines from return type void to int where the integer returned is now used as a status flag. This removed many of the LOGICAL error parameters passed. While this may make the code a bit less readable, the consistent use of this technique may make just as much sense in the long run.
  15. Error messages were improved in interact/command.c and plot/set.c.
  16. Substantial changes to the manual including a new appendix of frequently asked questions and answers. A new example figure was also added which demonstrates how to specify the Hershey symbols and their corresponding numbers.