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

front end - keyboard shortcut to invoke Insert new matrix

I frequently need to type in some matrices, and the menu command Insert > Table/Matrix > New... allows matrices with lines drawn between columns and rows, which is very helpful. I would like to make a keyboard shortcut for it, but cannot find the relevant frontend token command (4209405) for it. Since the FullForm[] and InputForm[] of matrices with lines drawn between rows and columns is the same as those without lines, it's hard to do this via 3rd party system-wide text expanders (e.g. autohotkey or atext on mac). How does one assign a keyboard shortcut for the menu item Insert > Table/Matrix > New... , preferably using only mathematica? Thanks! Answer In the MenuSetup.tr (for linux located in the $InstallationDirectory/SystemFiles/FrontEnd/TextResources/X/ directory), I changed the line MenuItem["&New...", "CreateGridBoxDialog"] to read MenuItem["&New...", "CreateGridBoxDialog", MenuKey["m", Modifiers-...
Post a Comment
Read more

How to thread a list

I have data in format data = {{a1, a2}, {b1, b2}, {c1, c2}, {d1, d2}} Tableform: I want to thread it to : tdata = {{{a1, b1}, {a2, b2}}, {{a1, c1}, {a2, c2}}, {{a1, d1}, {a2, d2}}} Tableform: And I would like to do better then pseudofunction[n_] := Transpose[{data2[[1]], data2[[n]]}]; SetAttributes[pseudofunction, Listable]; Range[2, 4] // pseudofunction Here is my benchmark data, where data3 is normal sample of real data. data3 = Drop[ExcelWorkBook[[Column1 ;; Column4]], None, 1]; data2 = {a #, b #, c #, d #} & /@ Range[1, 10^5]; data = RandomReal[{0, 1}, {10^6, 4}]; Here is my benchmark code kptnw[list_] := Transpose[{Table[First@#, {Length@# - 1}], Rest@#}, {3, 1, 2}] &@list kptnw2[list_] := Transpose[{ConstantArray[First@#, Length@# - 1], Rest@#}, {3, 1, 2}] &@list OleksandrR[list_] := Flatten[Outer[List, List@First[list], Rest[list], 1], {{2}, {1, 4}}] paradox2[list_] := Partition[Riffle[list[[1]], #], 2] & /@ Drop[list, 1] RM[list_] := FoldList[Transpose[{First@li...
Post a Comment
Read more

functions - Get leading series expansion term?

Given a function f[x] , I would like to have a function leadingSeries that returns just the leading term in the series around x=0 . For example: leadingSeries[(1/x + 2)/(4 + 1/x^2 + x)] x and leadingSeries[(1/x + 2 + (1 - 1/x^3)/4)/(4 + x)] -(1/(16 x^3)) Is there such a function in Mathematica? Or maybe one can implement it efficiently? EDIT I finally went with the following implementation, based on Carl Woll 's answer: lds[ex_,x_]:=( (ex/.x->(x+O[x]^2))/.SeriesData[U_,Z_,L_List,Mi_,Ma_,De_]:>SeriesData[U,Z,{L[[1]]},Mi,Mi+1,De]//Quiet//Normal) The advantage is, that this one also properly works with functions whose leading term is a constant: lds[Exp[x],x] 1 Answer Update 1 Updated to eliminate SeriesData and to not return additional terms Perhaps you could use: leadingSeries[expr_, x_] := Normal[expr /. x->(x+O[x]^2) /. a_List :> Take[a, 1]] Then for your examples: leadingSeries[(1/x + 2)/(4 + 1/x^2 + x), x] leadingSeries[Exp[x], x] leadingSeries[(1/x + 2 + (1 - 1/x...
Post a Comment
Read more