Hi, I am running some codes and stores the solution in the text file. However, I found that some results are wired in the sense that some processors are "eating" my (i,j) index and the corresponding solution. For example, the solution at time step =235 on processor 6 is right, but at time step = 236 on processor 6, one grid solution is missing and thus the order of the index is wrong. In the attached two files: hp.solution.dt0.16700.n90.t235.p6 (right one) hp.solution.dt0.16700.n90.t236.p6 (wrong one) for example, in hp.solution.dt0.16700.n90.t235.p6 (right one) i j --------------------------------------------------------------------------------------------------------------------------------------------------------------------- 50 14 3.3212491928636803e-02 7.2992225179014901e-03 2.9841295384404947e+00 2.2004855368148415e-02 51 14 4.0287965701667774e-02 2.5401878231124070e-03 2.9201873761746322e+00 2.6251864239477816e-02 52 14 4.7084950235070790e-02 -1.5367647745423544e-03 2.8460826176461214e+00 3.1550405800570377e-02 53 14 5.3394938807608198e-02 -3.8189091837479271e-03 2.7618414550374171e+00 3.4078755072804334e-02 -------------------------------------------------------------------------------------------------------------------------------------------------------------------- however, in hp.solution.dt0.16700.n90.t236.p6 (wrong one) i j --------------------------------------------------------------------------------------------------------------------------------------------------------------------- 50 14 3.1239406700376452e-02 8.5179559039992043e-03 2.9840003096148520e+00 2.1760859158622522e-02 51 14 3.8032143218986063e-02 3.6341965920997721e-03 2.9198035731818854e+00 2.6200771510346648e-02 53 14 5.0661309132451274e-02 -2.9274557377189617e-03 2.7606822480069755e+00 3.4021016413777964e-02 54 14 5.6049570141121191e-02 -2.8111244430837979e-03 2.6669503598276267e+00 3.8855104759650566e-02 -------------------------------------------------------------------------------------------------------------------------------------------------------------------- the (i,j) = (52,14) is missing and as a result, one grid point solution is missing. I did not understand how this happens and why this happens? Any ideas? Thanks very much! Cheers, Rebecca -- (Rebecca) Xuefei YUAN Department of Applied Physics and Applied Mathematics Columbia University Tel:917-399-8032 www.columbia.edu/~xy2102