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edit] My UDF won't interpret or compile - what is wrong?

Fluent FAQ -- CFD-Wiki, the free CFD reference
If Fluent complains about not being able to find a compiler, then check to make sure that the compiler is properly installed. On Windows machines, it is possible to install the Visual C++ compiler without fully setting up the command line compiler (which Fluent needs to be able to find). During the installation process, you need to select the "register environment variables" option.
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edit] My UDF interprets/compiles but fails to execute - what is wrong?

Fluent FAQ -- CFD-Wiki, the free CFD reference
This commonly occurs due to a faulty operation of some kind. For example, user-defined memory (UDM) is not allocated until initialization, so attempting to access a UDM variable before initialization can lead to a segmentation fault. Try to isolate the cause, and then look for places where your expectation of what is available may not match reality. Finally, keep in mind that if you do something really bad, you may need to restart Fluent before even a fixed UDF will work.
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Why won't Apache compile with my system's cc?

Apache Server Frequently Asked Questions
This might be either because it's completely unknown or because the specific environment (include files, OS version, et cetera) isn't explicitly handled. If this happens, you may need to port the server to your OS yourself. Some operating systems include a default C compiler that is either not ANSI C-compliant or suffers from other deficiencies. The usual recommendation in cases like this is to acquire, install, and use gcc.
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How do I compile a servlet? Q: Why won't my servlet compile?

Code Style: Java servlets frequently asked questions (FAQ)
All those "cannot find symbol" error messages mean that you do not have the Java servlet JAR file on your compiler's classpath, so it cannot find the servlet class files. The servlet JAR file is normally distributed with your servlet container. For Apache Tomcat it is a file named {CATALINA_HOME}/common/lib/servlet-api.jar. Add this to your compiler classpath as follows.
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edit] How do I learn UDF programming?

Fluent FAQ -- CFD-Wiki, the free CFD reference
There are not to many tutorials out there on this, probably due to the wide variety of things you can do with the UDF interface. The documentation the Fluent provides is pretty good once you know what you are trying to do (chapter 8 of the UDF manual has examples). UDF programming is easier if you have C programming experience, so it is advisable to learn a little C programming, then do some of the simple cases that Fluent provides, then tackle the problem you really want to solve.
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edit] bioperl-ext won't compile the staden IO lib part - what do I do?

FAQ - BioPerl
Are you sure io_lib is installed where you think it is, and that the install path is seen by Perl (did you answer the questions during perl Makefile.PL ?)
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I installed LessTif but I can't compile apps with it. What's wrong ?

LessTif Frequently Asked Questions
You may have an application that's not error-free; or (more likely) one which needs configuration for your site, computer platform, etc. If it's not a bug within the application it probably has to do with your compiler options. If it's indeed that, there are several possibilities. In the examples we'll give now, we'll be using some installation directories that may differ from your installation.
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Why won't a consultant edit my paper for me?

UNO | Writing Center | Home
Our goal is to make you a self-sufficient editor of your own writing, and doing the work for you will not achieve that goal. Instead, we will help you identify errors in your writing and help you learn ways to avoid those errors.
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edit] How do I create/build/load a UDF?

Fluent FAQ -- CFD-Wiki, the free CFD reference
The simplest way to add a UDF into Fluent is to write your UDF in the C programming language and then use Define -> User-Defined -> Functions to either interpret or compile your UDF. It can then be loaded. Fluent provides good documentation of the UDF interface with numerous examples, so read that before trying too much.
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Why won't GIMP compile on 64-bit or IRIX (SGI) machines?

GIMP - Documentation
If you are using a 64-bit OS, you need to add the -o32' option for the compiler, or use gcc. With the SGI compiler, you may also need to play with optimization. Some modules may have exhibit problems unless compiled with -O1' or even '-O0'. Script-Fu requires the POSIX-compliant regex functions, which SGI only supports with IRIX 6.2 and later versions. The GNU version of regex should work just fine, though, and is available at:
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Why won't my servlet compile? Q: Can I use a constructor in my servlet?

Code Style: Java servlets frequently asked questions (FAQ)
A servlet is a normal Java class, so when there are no custom constructors, there is an implicit default constructor with no arguments. Servlet containers typically use the Class.newInstance() method to load servlets, so you must be careful to add an explicit default constructor if you add non-default constructors.
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What is UDF?

Article Archives - catch up on all the articles you've misse...
Universal Data Format is an ISO-compliant file system, endorsed by the OSTA (Optical Storage Technology Association), and used by packet-writing and other optical recordable disc technologies, like DVD. Drag-to-Disc uses UDF 1.5 and packet writing to give CD-R and CD-RW drives the effective usability of a large floppy disk. Computers require UDF reading software in order to read UDF-formatted discs.
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Why won't my WML pages compile?

Kannel: Open Source WAP and SMS Gateway
Another common failure, for some WML pages, is seen when the wapbox log-file read something like "WML compiler: Parsing failed, no parsed document." Here, the libxml parser failed to understand the WML page, for some reason. Either the page is really malformed, or libxml has a problem. use 'xml-config --version' or 'rpm -q libxml', 'rpm -q libxml2', 'rpm -q libxml-devel' or 'rpm -q libxml2-devel' to find out whether libxml is installed on your system at all, and to see which version it is at.
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Why won't Kogut compile?

The Kogut FAQ
Make sure that if you don't already have Kogut installed that you're using the bootstrapped version of Kogut. Also make sure that you have a few basic Unix utilities: a C compiler, make, and a Bourne or Bash-style shell. If you're on Windows or Mac OS X, this probably means downloading Cygwin or Fink to get these tools. If all else fails, post your error to the Kogut mailing list.
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My code won't compile..why?

Section 4 - Using GCC
The compiler found a symbol that it wasn't expecting.. for example, an extra paren on a complex if check, a semicolon placed after a function body header, a semicolon omitted from the previous line amongst others. The error is not always on the line mentioned by gcc, but may be the previous line. This error arises when you assign a pointer to a non-pointer variable.
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How do we edit/compile/run our code?

FAQ - 2005 Rocky Mountain Regional ACM
Again site specific. Assuming you are using a unix-like operating system the least-common-denominator editor is probably pico, which you can run by typing at the command prompt. emacs and vi have (many) more features, but a harder learning curve. xemacs, if available, is pretty easy to use and has a lot of features. Eclipse, KDevelop, or Visual Studio may also be available and have many features. Ask your site director.
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The compile option is grayed out. What's wrong?

ECE 324/325 Lab Frequently Asked Questions
You have to have a project open in order to compile. You cannot start Quartus, open a file and tell it to compile. So be sure to always open your project (or create a new one) when you start Quartus.
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edit] Why are the wrong image tiles showing up?

World Wind FAQ - World Wind Wiki
It is possible that you are viewing more than one layer and therefore are not seeing the tile you expect. Go to the Layer Manager and make sure only one image layer box is checked. If you still believe that the tile contains bad data you can hit F5 to refresh the current view. This will redownload all visible tiles for all active layers. Alternatively, follow the instructions for "How are the tiles named?" to delete the individual tile.
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Why won't the GIMP compile on Solaris?

GIMP Developer FAQ
There may be a number of reasons. Several peoples' answers are here. The most detailed answers, list first, are the best bets with their noted versions. According to resident Gimp on SOlaris guru Jim Harmon, more recent versions (0.99.25 on) should compile easily, but you may need to make a change in /usr/graphics/gtk-config.in: OLD: --libs) echo -L${exec_prefix}/lib -L/usr/openwin/lib -R/usr/openwin/lib \ -lgtk -lgdk -lglib -lXext -lX11 -lsocket -lnsl -lm ;; NEW: (subs.
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Why won't my copy of TINA compile?

TINA [faq]
Not an easy question to answer remotely. The wiki page in the developer's area includes solutions to some common problems.
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Why won't OpenDX compile with my system's cc?

OpenDX - FAQ
This might be either because it's completely unknown or because the specific environment (include files, OS version, et cetera) isn't explicitly handled. If this happens, you may need to port the code to your OS yourself. Some operating systems include a default C compiler that is either not ANSI C-compliant or suffers from other deficiencies. The usual recommendation in cases like this is to acquire, install, and use gcc.
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Why won't GIMP compile on IRIX (SGI)?

GIMP User FAQ
If you are using a 64-bit OS, you need to add the '-o32' option for the compiler, or use gcc. With the SGI compiler, you may also need to play with optimization. Some modules may have exhibit problems unless compiled with '-O1' or even '-O0'. Script-Fu requires the POSIX-compliant regex functions, which SGI only supports with IRIX 6.2 and later versions. The GNU version of regex should work just fine, though, and is available at: http://wuarchive.wustl.edu/systems/gnu/regex-0.12.tar.
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Compiling 3.1 - Why won't FlightGear compile?

FlightGear FAQ
Well, that depends. First make sure you are using the appropriate versions of FlightGear, SimGear, plib, zlib. If any of the packages are out of sync with the others, compilation may fail. The FlightGear Downloads page (http://flightgear.org/Downloads/) should tell you what versions you need if you are trying to compile the latest stable release. If you are using a development snapshot, make sure all three packages are up-to-date.
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How do I interpret the data?

P & I Frequently Asked Questions
How do I compare this study to next year? If the stage I's and II's increase, ask yourself why. The staff may be more aware now and are finding the ulcers. Has there been a change in the population? Did you use a validated risk assessment tool or validate the tool you used? Have the III's and IV's decreased? If you buy therapeutic mattresses for your beds, the study should be done prior to their use and then a year after they are put into use.
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How do I interpret my results?

WorldFamilies.net: Where Genealogy meets DNA testing
Generally, you interpret your results by comparing them with the results of other participants. (See What determines a match?)
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Is there anyway I can "undo" an edit operation if I delete the wrong track while editing?

Minidisc Frequently Asked Questions
Modern Sony MD decks also have a hidden super UNDO function. A user describes how to cancel a pending TOC update on modern Sony MD decks. If you have an older machine without an ''UNDO'' function, there are two approaches. If you've got an MDS-302, 303, S35, or S37, try this first: This machine doesn't have a specific undo function, but it can be made to forget about the edits in a simple manner, without having to open the unit.
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Should I do anything before submitting my UDF?

CFLib.org - CFLib.org FAQ
The most important thing to do before submitting a UDF is to make sure ColdFusion doesn't already have a function that does the same thing as your UDF. Believe it or not, a few times a month we get submissions for UDFs that mirror existing ColdFusion functions. In general, it is recommended that you check the ColdFusion documentation. (Actually, there is quite a lot of good information in there!)
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Will my UDF be modified?

CFLib.org - CFLib.org FAQ
It could be. If you submit a UDF that does not follow the standards, or if we find a bug, or even if we just see a way that your UDF can be improved, we will edit it. However, before we change your code, we will ask. If you do not approve of a change we feel is critical, we will not approve the UDF. Again, CFLib.org is not the Developer's Exchange. We feel by exercising this type of control, we can better ensure the overall quality of the site.
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