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This happens in Windows 7 because SWI Prolog needs administrator privileges to update an index. If it doesn't, type CTRL-ALT-DELETE and use the Task Manager to shut down SWI-Prolog. To may, the warnings disappear, simply change the statements to: In the following statements, Y, Z and W are all singleton variables: This essentially serves as a wildcard that will match anything. In those cases, you can make the warning go away by replacing the variable with the underscore character '_'. However, there are cases where you simply don't care what binding the variable has.

This lets you know that there may be a spelling mistake or that you forgot to use the variable elsewhere in the statement. This warning indicates that you have a statement in which a variable only appears once. The message go away, simply make sure all rules with the sameДЇunctor in the head (i.e., left hand side) and all facts with the same Required, which is why it is only a warning and not an error. Generally, Prolog programs are easier to read when all of theД¬lauses with the same head are grouped together. Warning: (c:/program files/prolog/:5):Д¬lauses of mypred/2 are not together in the source-file Sometimes when you consult your Prolog code, you will see an error such as: Now when you use the New or Edit menu options, PCE Emacs should be the default editor.

Remove the initial '%', effectively uncommenting the line.

As a result, a file should be opened in a text editor.

The system will say that it could not find an initialization file, and ask if you want to create one.

In order to make PCE Emacs the default editor from SWI Prolog, do the following

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However, the default install is configured to use your normal text editor (usually Notepad). The editor I used in class (called PCE Emacs) comes with your SWI Prolog download. Follow the installation instructions given in the download. Go to the SWI-Prolog download page and get the stable release.

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If you do not have access to Lehigh's standard software installation process, you can download SWI-Prolog yourself.

Note, if you have WIRED access from your dorm room, then this install method should also work. From the list of available software, select SWI-Prolog and proceed with the install instructions. Otherwise, go to the Start menu, select 'All Programs', and then select 'Install Software' (it should be at the top of the menu). If you have the standard Lehigh background screen, then you can simply click 'Install Software'. If it is missing, you can do a standard Lehigh network installation. If you see the program in the list, then you do not need to do anything else but select it in order to run it. If you are in a public Lehigh computer lab, first check to see if SWI-Prolog is already installed by clicking 'Start' and 'All Programs'.

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How do I install SWI-Prolog on a Windows PC in a Lehigh Public Site?.

Whenever I try to 'Reload modified files', I get the error: 'ERROR: open/3: No permission to open source_sink `' (Permission denied)'.

My program appears to be stuck in an infinite loop.

What does the 'Singleton variables' warning mean, and how can I fix it?.

What does the 'clauses are not together in the source-file' error mean?.

In class you showed us a special editor that colorizes the Prolog program.

How do I install SWI-Prolog on my personal computer?.

How do I install SWI-Prolog on a PC in a Lehigh Public Site?.

If you don't find the answer to your question here, you may also want to try the official SWI-Prolog FAQ. This FAQ is designed specifically for Lehigh students taking CSE 327.

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