# Getting xodeint from numerical recipes to work in dev-c++

• C/++/#
I am taking a computational physics course, and currently I have very little knowledge of programming. I have downloaded the numerical recipes machine-readable code, and I am trying to get one of their examples to work in dev-c++. Unfortunately, I am having difficulty.

I have copied xodeint.c, odeint.c, nrutil.h, nrutil.c, and nr.h from subdirectories of ./nr_c304/legacy/nr2/C_211 into my project folder. I then pulled up xodeint.c in dev-c++. Upon compilation, I got the following errors:

Code:
6   0   C:\Users\Amol\Documents\School\graduate computational\ODEexample\xodeint.c  In file included from C:\Users\Amol\Documents\School\graduate computational\ODEexample\xodeint.c
183 7   C:\Users\Amol\Documents\School\graduate computational\ODEexample\nr.h   [Warning] conflicting types for built-in function 'fmin' [enabled by default]
C:\Users\Amol\AppData\Local\Temp\ccAOtzsJ.o xodeint.c:(.text+0x195): undefined reference to vector'
C:\Users\Amol\AppData\Local\Temp\ccAOtzsJ.o xodeint.c:(.text+0x1a8): undefined reference to vector'
C:\Users\Amol\AppData\Local\Temp\ccAOtzsJ.o xodeint.c:(.text+0x1cd): undefined reference to matrix'
C:\Users\Amol\AppData\Local\Temp\ccAOtzsJ.o xodeint.c:(.text+0x1ef): undefined reference to bessj0'
C:\Users\Amol\AppData\Local\Temp\ccAOtzsJ.o xodeint.c:(.text+0x211): undefined reference to bessj1'
C:\Users\Amol\AppData\Local\Temp\ccAOtzsJ.o xodeint.c:(.text+0x238): undefined reference to bessj'
C:\Users\Amol\AppData\Local\Temp\ccAOtzsJ.o xodeint.c:(.text+0x25f): undefined reference to bessj'
C:\Users\Amol\AppData\Local\Temp\ccAOtzsJ.o xodeint.c:(.text+0x2b5): undefined reference to rkqs'
C:\Users\Amol\AppData\Local\Temp\ccAOtzsJ.o xodeint.c:(.text+0x30a): undefined reference to odeint'
C:\Users\Amol\AppData\Local\Temp\ccAOtzsJ.o xodeint.c:(.text+0x3e7): undefined reference to bessj'
C:\Users\Amol\AppData\Local\Temp\ccAOtzsJ.o xodeint.c:(.text+0x4d4): undefined reference to free_matrix'
C:\Users\Amol\AppData\Local\Temp\ccAOtzsJ.o xodeint.c:(.text+0x4f1): undefined reference to free_vector'
C:\Users\Amol\AppData\Local\Temp\ccAOtzsJ.o xodeint.c:(.text+0x508): undefined reference to free_vector'
C:\Users\Amol\Documents\School\graduate computational\ODEexample\collect2.exe   [Error] ld returned 1 exit status
So I suppose I'm missing some files in my project folder that are necessary to compile the code, but I'm not sure what I'm missing. I have tried adding certain files to my project folder, such as bessj1.c, however this does not change the errors I receive. Any help in getting this working would be much appreciated.

Regards.

Related Programming and Computer Science News on Phys.org
Stephen Tashi

The phrase "machine readable code" is confusing. A file like xodeint.c that ends in ".c" should be human readable source code file, not a file of machine code.

Stephen Tashi
You are correct that something is missing. Compling a program can produce errors about missing things in two stages. The error can happen as a source code file is being compiled or the error can happen after the files are compiled and the linker tries to link up the object files that have been produced by the compiler.

I think the errors you show are happening when the program is being linked. (I don't use the ming compiler myself, so I base this on http://www.mingw.org/wiki/the_linker_consistently_giving_undefined_references ). Can you post the command that your development environment is using to link the program. It may mention some libraries that you haven't downloaded.

jim mcnamara
Mentor
Stephen is correct. Those errors are unresolved symbols (function entry points). NB you are trying to compile C source with dev-c++. C++ and C are NOT the same language. I do not know dev-c++, it may have a switch setting to become a C compiler, but I doubt it. I would doubt the validity of final compiled result, if it ever succeeds. C++ runtime API semantics are not necessarily the same as those for C.

There are free C compilers - gcc is one. Consider using that. Are you on Windows, Cygwin, or Linux?

Ignoring the compiler for now -- There some possibilities:

1. You are missing some "primary" .c files
2. You have to compile some intermediate object files (usually creates a .o file) from some existing .c files. Then place them on the final compile command line.

IMO, We should get you going with a C compiler first.