Skip to main content

external calls - Error loading shared library libML64i3.so


I'm trying to call Mathematica from C. I'm following the example https://mathematica.stackexchange.com/a/32864/14301 with http://reference.wolfram.com/mathematica/tutorial/MathLinkDeveloperGuide-Unix.html#725481284


The code I have is: mlcall.c (identical to what i linked)


#include 
#include 


int main(int argc, char *argv[]) {
    MLENV env;
    MLINK link;
    int errno;
    int packet;

    env = MLInitialize(0);

    /* consider using MLOpenString instead here: */    


    link = MLOpenArgcArgv(env, argc, argv, &errno);

    MLActivate(link);

    /* send 42+137 using the full form Plus[42, 137] */
    MLPutFunction(link, "Plus", 2);
    MLPutInteger(link, 42);
    MLPutInteger(link, 137);
    MLEndPacket(link);


    /* get packets until we find a ReturnPacket or error */
    while ((packet = MLNextPacket(link)) && packet != RETURNPKT)
        MLNewPacket(link);

    if (MLError(link))
        printf("error.\n");
    else {
        int result;
        MLGetInteger(link, &result); /* we know that the result is an integer in this case */

        printf("result: %d\n", result);
    }

    return 0;
}

and makefile:


MLINKDIR = /opt/Mathematica-9.0/SystemFiles/Links/MathLink/DeveloperKit
SYS=Linux-x86-64
CADDSDIR = ${MLINKDIR}/${SYS}/CompilerAdditions


INCDIR = ${CADDSDIR}
LIBDIR = ${CADDSDIR}

MLLIB = ML64i3

EXTRALIBS = -lm -lpthread -lrt -lstdc++ # Set these with appropriate libs for your system.

mlcall: mlcall.c
    $(CC) -O mlcall.c -I$(INCDIR) -L$(LIBDIR) -l${MLLIB} ${EXTRALIBS} -o $@


clean:
    rm mlcall

Output of make is:


cc -O mlcall.c -I/opt/Mathematica-9.0/SystemFiles/Links/MathLink/DeveloperKit/Linux-x86-64/CompilerAdditions -L/opt/Mathematica-9.0/SystemFiles/Links/MathLink/DeveloperKit/Linux-x86-64/CompilerAdditions -lML64i3 -lm -lpthread -lrt -lstdc++  -o mlcall

So no errors, but when I try to run mlcall with either ./mlcall or ./mlcall -linkmode launch -linkname "/usr/bin/MathKernel" I get the following error:


./mlcall: error while loading shared libraries: libML64i3.so: cannot open shared object file: No such file or directory


I do have libML64i3.so in the directory /opt/Mathematica-9.0/SystemFiles/Links/MathLink/DeveloperKit/Linux-x86-64/CompilerAdditions -L/opt/Mathematica-9.0/SystemFiles/Links/MathLink/DeveloperKit/Linux-x86-64/CompilerAdditions and I also tried to copy it to the directory I was running mlcall in. What should I do?



Answer



On Linux you can add the directory containing this library to LD_LIBRARY_PATH.


A semi-automated way to do this from a command prompt is this:


MATHLINK=$(dirname $(readlink -f $(which math)))/../SystemFiles/Links/MathLink/DeveloperKit/Linux-x86-64/CompilerAdditions

export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:$MATHLINK

You can use this merthod of detecting the location in a shell script that will start your program.


Comments

Post a Comment

Popular posts from this blog

plotting - How to draw lines between specified dots on ListPlot?

I would like to create a plot where I have unconnected dots and some connected. So far, I have figured out how to draw the dots. My code is the following: ListPlot[{{1, 1}, {2, 2}, {3, 3}, {4, 4}, {1, 4}, {2, 5}, {3, 6}, {4, 7}, {1, 7}, {2, 8}, {3, 9}, {4, 10}, {1, 10}, {2, 11}, {3, 12}, {4,13}, {2.5, 7}}, Ticks -> {{1, 2, 3, 4}, None}, AxesStyle -> Thin, TicksStyle -> Directive[Black, Bold, 12], Mesh -> Full] I have thought using ListLinePlot command, but I don't know how to specify to the command to draw only selected lines between the dots. Do have any suggestions/hints on how to do that? Thank you. Answer One possibility would be to use Epilog with Line : ListPlot[ {{1, 1}, {2, 2}, {3, 3}, {4, 4}, {1, 4}, {2, 5}, {3, 6}, {4, 7}, {1, 7}, {2, 8}, {3, 9}, {4, 10}, {1, 10}, {2, 11}, {3, 12}, {4, 13}, {2.5, 7}}, Ticks -> {{1, 2, 3, 4}, None}, AxesStyle -> Thin, TicksStyle -> Directive[Black, Bold, 12], Mesh -> Full, Epilog -> { Line[ ...
Post a Comment
Read more

equation solving - Invert and fit implicitly defined curve

I need to fit an implicitly defined curve. I thought I could get some data out of Solve , and then using FindFit . Therefore, I would like to find the relation the parametric curve defined by $F(x,y)=0$: Solve[-(1/2) + 1/2 (0.41202 BesselK[0, 0.1 Sqrt[x^2 + y^2]] + (0.101483 x BesselK[1, 0.1 Sqrt[x^2 + y^2]])/Sqrt[x^2 + y^2]) == 0, y] But I can't get an output: Solve was unable to solve the system with inexact coefficients or the system obtained by direct rationalization of inexact numbers present in the system. Since many of the methods used by Solve require exact input, providing Solve with an exact version of the system may help. >> Edit: In particular, I would like to fit the data coming from the curve with the expression of another curve, and not with a function $f(x)$. In particular, since this clearly looks like a cardioid , I would like it to fit to something like it. What other strategies could I try?
Post a Comment
Read more

dynamic - How can I make a clickable ArrayPlot that returns input?

I would like to create a dynamic ArrayPlot so that the rectangles, when clicked, provide the input. Can I use ArrayPlot for this? Or is there something else I should have to use? Answer ArrayPlot is much more than just a simple array like Grid : it represents a ranged 2D dataset, and its visualization can be finetuned by options like DataReversed and DataRange . These features make it quite complicated to reproduce the same layout and order with Grid . Here I offer AnnotatedArrayPlot which comes in handy when your dataset is more than just a flat 2D array. The dynamic interface allows highlighting individual cells and possibly interacting with them. AnnotatedArrayPlot works the same way as ArrayPlot and accepts the same options plus Enabled , HighlightCoordinates , HighlightStyle and HighlightElementFunction . data = {{Missing["HasSomeMoreData"], GrayLevel[ 1], {RGBColor[0, 1, 1], RGBColor[0, 0, 1], GrayLevel[1]}, RGBColor[0, 1, 0]}, {GrayLevel[0], GrayLevel...
Post a Comment
Read more