2.4.8 Running the Model and Reviewing the Results

     Now that we have a complete and error‑free runstream input file, we are ready to run the model and then review the results.  The PC‑executable files available on the SCRAM BBS open the runstream input and printed output files explicitly within the model, so there is no need to "redirect" the I/O on the command line using the DOS redirection symbols '<' and '>'.  The command line to run the sample problem might look something like this on the PC:


The "c‑prompt" of DOS has been represented by the characters "C:\>", but may appear different on different machines.  The important points are that the ISCST3.EXE file either be in the directory from which you are attempting to run the model, or in a directory that is included on the DOS PATH command when the system is "booted‑up."  The runstream input filename must appear first (without any DOS "redirection" symbol), followed by the desired output filename (also without the DOS redirection symbol), and these files must also be located in the directory from which the model is being executed, unless a complete DOS pathname is provided on the command line.

     As mentioned above, the SCRAM PC‑executable files for ISC open the input and output files explicitly.  One reason for  this is to allow for the models to write an update on the status of processing to the PC terminal screen.  For the ISCST model, the model first indicates that setup information is being processed and then gives the Julian day currently being processed.  If no status message is seen then the model did not load into memory properly.  If the model stops after completing the setup processing, then either the RUNORNOT option was set NOT to run, or a fatal error was encountered during the setup processing.  Another reason for not sending the printed output to the default output device (i.e., to the screen or redirected to a file), is so that any DOS error messages will be visible on the screen and not be written to the printed file.  One such message might be that there is insufficient memory available to run the program.  Handling of DOS error messages may require some knowledge of DOS, unless the meaning of the message is obvious.




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