svd compiling error with itensor v3

Question

Hi,

I am new to c++ and itensor. When I try to do some svd with tensor version, I get a link error from the compiler as:

Undefined symbols for architecture x8664:
"itensor::svd(itensor::ITensor const&, itensor::ITensor&, itensor::ITensor&, itensor::ITensor&, itensor::Args)", referenced from:
_main in myappname.o
ld: symbol(s) not found for architecture x8664
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make: *** [myappname] Error 1

But it works well with itensor version 2. Can anyone help me solve this error?
Thanks.

Answer 1

Hi, thanks for reporting this issue. However, I was not able to reproduce it unfortunately. Could you please post some minimal code that you were trying to compile that led to getting this message? (So like the contents of myappname.cc?) Thanks!

Miles

Comments

#include "itensor/all.h"
#include "myclass.h"

using namespace itensor;

int
main()
    {
        auto i = Index(2);
        auto j = Index(2);

        auto T = randomTensor(i,j);
        ITensor U(i),D,V;
        svd(T,U,D,V);

        PrintData(T);
        PrintData(U);
        PrintData(D);
        PrintData(V);

        return 0;
    }

This is the code I tried. Thanks for your response.

---

Hi, thanks, however I do not get the error you get with that code.
Could you please try:
1. change "randomTensor" to "randomITensor" (we have deprecated randomTensor).
2. do a "make clean" and then "make" to fully recompile the ITensor library
3. then recompile your code
and see if that helps?

---

I solved the error by "make clean" and "make".

Thanks.