I am introducing into Octave programming and I am interested in defining an sparse matrix as here, so I have the following code:
spdiag ([1, 2, 3], 1)
And I got the error "error: 'spdiag' undefined near line 1 column 1"
I understand that for some reason the Octave build-in function spdiag cannot be found but I do not understand whether I have to include some Octave module and/or set some environmental variable in order to make it work.
I would really appreciate some help.
By the way I am working under Ubuntu 13.10 and the octave version is 3.6.4.
The manual you are reading for a very very old version of Octave. If you go to the main page, you'll notice this is the manual for version 3.0.2 and released in August 2008. The function spdiag was deprecated in version 3.2.0 and removed in 3.6.0.
If you use the Octave website, you will always get the latest version of the manual. In addition, the manual in both html and pdf forms is part of the Octave installation. Since you are using Ubuntu, you can install the package octave-doc to get the manual for the same version you have installed.
Related
i try to add the libary jpggraph to my Debian Linux System with PHP 5.6.40 installed. I followed the installation manual from jpgrpah.net but get still the following error-message in the browser when starting a test program:
Catchable fatal error: Argument 1 passed to JpGraphException::defaultHandler() must be an instance of Throwable, instance of JpGraphExceptionL given in /usr/share/php/jpgraph/jpgraph_errhandler.inc.php on line 158
Does anyone have an idea what to do?
If you need further information like the php.ini or other coniguration files please tell me.
Best regards
Lars
I copied the extracted archive in /usr/share/jpgraph/
I followed the manual an made the changes in php.ini
I made changes recommended in the manual in the jpgraph-config.ini.php
I started an example program from jpgraph.net
I got the error message.
I checked all changes, if they match with the recommended changes in the manual.
I expected to see a graph in the browser window.
I am currently having an issue with Octave install in Archlinux. I am not able to load the current version of Octave 4.2.1 in Arch. It shows the following message -
/usr/lib/octave/4.2.1/exec/x86_64-pc-linux-gnu/octave-gui: error while loading shared libraries: libgfortran.so.3: cannot open shared object file: No such file or directory
This problem with libgfortran.so.3 is not rare. Here are two similar problems happening in R 1 and 2. If somebody using Octave on Archlinux came across this issue, can you share how to resolve it. Thanks.
From the comments it became apparent that the solution from the referenced question R v3.4.0-2 unable to find libgfortran.so.3 on Arch needs to be appended, because the way the older GCC versions will be typically installed in Arch Linux is in a different path.
So, one must find, where the older version is installed, like
/usr/lib/gcc/x86_64-pc-linux-gnu/5.4.0/libgfortran.so.3
(depending on the exact GCC version)
and then add the version to LD_LIBRARY_PATH or make a symlik of the library from the above path to /usr/lib64/.
I got this issue because I installed earlier additionally openblas-lapack from AUR for better octave matrix multiplication performance. Updating openblas-lapack to newest version in AUR did the trick for me.
Situation
I work with Ubuntu 14.04. I am building GNU Octave 4.2.1 from source with GNU 6.3.0. This version of Octave is quite new, but I see the issue arising also when trying to compile older Octave releases (down to 3.8.1).
I configure the build of Octave with
${sourcedir}/configure --prefix=/opt/octave/4.2.1 \
--with-java-homedir=/usr/lib/jvm/default-java \
--with-java-libdir=/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/amd64/server
Issue
The compilation is successful but the undesired warning shows up
configure: WARNING: ARPACK library found, but does not seem to work properly; disabling eigs function
I would rather like to have the eigs() function in place.
Information
I have built ARPACK-ng myself with the same compiler. All tests in the test suite (make check) are passed. The environment variables LD_LIBRARY_PATH and PKG_CONFIG_PATH point to the ARPACK library directory as intended. The configure file of Octave recognizes that location correctly, as seen before.
Besides, I get the same message if I compile Octave in another computer where ARPACK is installed natively (libarpack2 and libarpack2-dev version 3.1.5-2). It does not change a thing if I also install the related extra libraries libarpack++2c2a and libarpack++2-dev using the package repository. So the issue appears to be independent of the origin of the ARPACK files.
The part of the configure.ac file of Octave that throws this error is
### Check for ARPACK library.
save_LIBS="$LIBS"
LIBS="$LAPACK_LIBS $BLAS_LIBS $FLIBS $LIBS"
OCTAVE_CHECK_LIB([arpack], ARPACK,
[ARPACK not found. The eigs function will be disabled.],
[],
[dseupd],
[Fortran 77], [don't use the ARPACK library, disable eigs function],
[warn_arpack=
OCTAVE_CHECK_LIB_ARPACK_OK(
[AC_DEFINE(HAVE_ARPACK, 1, [Define to 1 if ARPACK is available.])],
[warn_arpack="ARPACK library found, but does not seem to work properly; disabling eigs function"])])
LIBS="$save_LIBS"
The farthest I go in tracing back the issue is that the subroutine OCTAVE_CHECK_LIB_ARPACK_OK issuing the warning lives in the file ${octave_source}/m4/acinclude.m4. It is written in m4 language, which I don't know
Question
Is it possible to understand why ARPACK 'does not seem to work properly'?
Is there any workaround for this?
Is this a false alarm or a bug?
I compiled MySQL++ with no issues. When I launched some of the executables (resetdb.exe and simple1.exe) they suggest to run to test if the installation has been successful, the first error I got was that libmysql.dll was missing.
Adding its path to the PATH environment variable did not fix the problem, even after launching a new command prompt; I had to copy the DLL in the directory where MySQL++ executables are.
Now the DLL is found, but I get this error:
simple1.exe - Application error
The application was unable to start correctly (0xc000007b).
Click OK to close the application.
even launching from the command line, I get no more information than these.
Thank you for any help!
MySQL 5.5 -
MySQL++ 3.0.9 -
Windows 7 64 bits -
MINGW32 -
GCC 4.4.0
0xC000007B is a Windows error that means the executable is corrupted. It could refer either to simple1.exe or to one of the DLLs it's linking against.
Some reasons this could happen:
You're mixing toolchains in an incompatible way. In your case, you may have built simple1.exe using pieces built by MinGW GCC and pieces built by Visual C++. MinGW should be compatible with any pure C DLL built by Visual C++, including the MySQL C API DLL. However, you may have other pieces interfering. MinGW isn't compatible with VC++ at the C++ level, but then, it shouldn't have linked at all if this were your problem.
You didn't follow the MySQL C API import library build steps in README-MinGW.txt. You either missed a step, or skipped it entirely and are trying to use the import library that shipped with MySQL.
In your previous gyrations, you ended up with a corrupt object file, which got linked in. Try saying make clean all at the top level of MySQL++ to force a complete rebuild.
You're mixing versions of MySQL or MySQL++. If you have more than one version of each on the system, make sure you're consistent in their use. That is, build the C API import library from the same DLL you run the programs against, use exrun.bat to run the examples to ensure you're using the just-built version of the MySQL++ DLL instead of another you have in your PATH, etc.
Additionally, I note that you're using an older version of MySQL++. If you were on Linux, I could understand that as some distributions still ship with 3.0.9. But since you have to build MySQL++ from source with MinGW, I don't see why you're not using 3.1.0. Did you get a binary build from somewhere?
As for your PATH problem, did you restart the MinGW shell after doing this? PATH updates don't affect running programs; they keep the value they saw when they started.
I'm trying to setting up a mySql connection using Matlab, I have read I few tutorial but unfortunately I can't get work of them. I had tried to compile the source(.cpp) but I got the following error:
Error: Could not detect a compiler on local system
which can compile the specified input file(s)
C:\PROGRA~1\MATLAB\R2010B\BIN\MEX.PL: Error: No compiler options file could be found to compile source code. Please run "mex -setup" to rectify.
So I I typed "mex -setup"
Please choose your compiler for building external interface (MEX) files:
Would you like mex to locate installed compilers [y]/n? y
Select a compiler:
[0] None
Compiler:
but there is no compiler.
Anybody can help me, how can I make a connection between matlab and mysql, I'm using windows 7 64 bit and Matlab 2010b.
I already installed wampserver.
Have you tried to establish MySQL connection from MATLAB using JBCC connector?
I did it successfully and put the complete workflow with the code example (requires Database Toolbox) in this question:
connection of MATLAB 7.0 and MYSQL
Haven't try on 64-bit though. Please let me know if it will fail.
UPDATE
You can also try the following submissions to File Exchange that do not require the Database toolbox:
queryMySQL
Access a MySQL database
I'm guessing you installed Matlab 64-bit as well, which does NOT come with a built-in MEX compiler (32-bit version uses lcc). You have a few options, but the easiest is to install Visual C++ Express (it's free! http://www.microsoft.com/express/Windows/) which will give you a 64-bit compatible compiler in the mex -setup listing. You'll have to double check which versions of the compiler 2010b is compatible with though.
Caveat: I tried this once and couldn't get it to work, but it was with like 2007b or something, and I didn't try that hard, I just installed 32-bit Matlab.