July 2018 - Comp-phys-alps-users

Problem in installing ALPS code in Ubuntu
by S Baidya 21 Jul '18

21 Jul '18

Dear ALPS users, I have downloaded alps-2.2.b4-src-with-boost.tar.gz in my linux pc with Ubuntu. I installed required python packages python2.7. I then untar by tar -xvzf alps-2.2.b4-src-with-boost.tar.gz Then mkdir build Then cd build Then cmake -DCMAKE_INSTALL_PREFIX=/home/cces/Downloads/ALPS/alps-2.2.b4-src-with-boost/alps/ .. I got an error. I tried different ways too using conda install but it did not work. So, I thought to build from source in linux as suggested in some websites. I have attached the Log file of the error. Can anyone please help me to install the alps in linux pc. I sent this mail before but I found there was an issue with maximum size of mail. So I have attached only one error file. Thanking you, Santu

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vispython not found in recently installed alps-2.3 in Ubuntu !
by S Baidya 20 Jul '18

20 Jul '18

Dear alps users, After struggling I just installed alps-2.3 in Ubuntu . I build the alps-2.3 successfully. Now i was trying to do some tutorials in the directory ./alps-2.3.0-src-with-boost/alps/tutorials by runing the executable ./runtutorial.sh which fails saying /runtutorial.sh: 10: ./runtutorial.sh: vispython: not found ./runtutorial.sh: 10: ./runtutorial.sh: vispython: not found What should I do. Is there anything else needed to install to install alps successfully and use it for application. Please tell me to solution to use alps without error. Thanks, Santu

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Reducing the number of correlation calculations in a run?
by PRADEEP 02 Jul '18

02 Jul '18

Dear ALPS community, I am using the DMRG programs (with OBC) to calculate the spin-spin correlations of a spin chain. Suppose N is the number of sites in the chain. My question is - while using the DMRG programs, is it possible to restrict calculations of correlations to a distance "d" between two sites where d<<N? Eg. instead of calculating all the N**2 correlations between all the spins, calculate only nearest neighbours or N-1 correlations? I want to obtain correlations for N>128 sites. ~60GB of RAM on a workstation is proving insufficient for this. I have been able to obtain local spin components <S_i^a> (a=x,y,z) for N=512 too. But, for the correlation calculations, N**2 correlations require more than 4 times the available RAM even for N=128. So I have to use smaller N, which leads to pronounced effects due to finite size and boundaries. Hence, the question. Thanks very much. with regards, Pradeep Thakur.

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