It will help me explore this issue if you send your input files.
Matthias Troyer
On Sep 28, 2013, at 2:49 PM, pradeep thakur pskvkthakur@gmail.com wrote:
Thank you for your time.
With regards, Pradeep Thakur.
On 28 September 2013 18:11, Matthias Troyer troyer@phys.ethz.ch wrote: We will look into that next week.
Thank you for reporting the problem
Matthias Troyer
On Sep 28, 2013, at 14:33, pradeep thakur pskvkthakur@gmail.com wrote:
I had not tried it before. But I tried it just now and still, I get the same msg: "Cannot evaluate expression Sy(i)".
On 28 September 2013 17:58, Matthias Troyer troyer@phys.ethz.ch wrote: Did you set the parameter COMPLEX to 1, so that it actually runs a complex version?
On Sep 28, 2013, at 2:26 PM, pradeep thakur pskvkthakur@gmail.com wrote:
Yes, I didn't use sqrt(-1); I simply used I.
I have been using the 4 DMRG codes.
The code which calculates the ground-state energy ran, but yielded results which didn't account for the additional term which had an "I" in it.
In the code for calculating correlations, I tried to calculate Sx:Sy. I defined Sy in the models.xml file as:
<SITEOPERATOR name="Sy" site="x"> -(I/2)*(Splus(x)-Sminus(x)) </SITEOPERATOR>
The program doesn't run and I get the message: "Cannot evaluate expression Sy(i)".
On 28 September 2013 17:32, Matthias Troyer troyer@phys.ethz.ch wrote: What code are you running?
sqrt(-1) will not work, by the way
On Sep 28, 2013, at 1:56 PM, pradeep thakur pskvkthakur@gmail.com wrote:
Dear Sir,
Thanks for your prompt response.
Yes, I did try I. The program for calculating the ground-state energy works as it did, without taking into account the new term (containing I) which I added in the models.xml file. I defined an Sy operator just like Sx. But Sy contains a sqrt(-1). The message I got was "Sy cannot be evaluated".
With regards, Pradeep Thakur
On 28 September 2013 17:13, Matthias Troyer troyer@phys.ethz.ch wrote: Have you tried I ?
On Sep 28, 2013, at 1:43 PM, pradeep thakur pskvkthakur@gmail.com wrote:
Dear All,
How can I introduce "i" (square-root of -1) into the model library (models.xml file)? I'm unable to define new site- and bond-operators which involve "i".
Any help will be very much appreciated.
With regards, Pradeep Thakur Dept. of Physics., University of Pune, Pune, Maharashtra, INDIA.