Non-unique time steps in output

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IsmBaha
Posts: 140
Joined: Sun Nov 17, 2013 11:00 pm
Location: University of Arizona

Non-unique time steps in output

Post by IsmBaha » Wed Oct 25, 2017 6:38 pm

Hello Frank and All,

I am running a model with varying time step algorithm. In some cases, I see that output file has non-unique time steps printed, though the response values are different in those steps.

An example output is below. First column is time, and following columns are response at different floor levels.

As you can see, the output at first time=1.18017 and second time=1.18017 are different but the output time values are same. It keeps repeating the non-unique time stepping as seen below.

Is this because of round off error? It could be very very small time step increment but when printing the response, opensees is rounding it to the same time step?

____time ________ floor1 _______ floor2 _________ floor3 ________ floor4

1.1801700e+02 -5.6703902e+00 -5.5019186e+00 -5.3192451e+00 -5.1208339e+00
1.1801700e+02 -5.6628670e+00 -5.4913302e+00 -5.3078582e+00 -5.1101951e+00
1.1801800e+02 -5.6558124e+00 -5.4811833e+00 -5.2967884e+00 -5.0996507e+00
1.1801900e+02 -5.6492972e+00 -5.4715358e+00 -5.2860692e+00 -5.0892093e+00
1.1801900e+02 -5.6433870e+00 -5.4624409e+00 -5.2757304e+00 -5.0788773e+00
1.1802000e+02 -5.6381418e+00 -5.4539468e+00 -5.2657982e+00 -5.0686600e+00
1.1802100e+02 -5.6336153e+00 -5.4460966e+00 -5.2562953e+00 -5.0585612e+00
1.1802100e+02 -5.6298538e+00 -5.4389275e+00 -5.2472409e+00 -5.0485840e+00
1.1802200e+02 -5.6268962e+00 -5.4324709e+00 -5.2386510e+00 -5.0387306e+00
1.1802200e+02 -5.6247732e+00 -5.4267520e+00 -5.2305379e+00 -5.0290031e+00
1.1802300e+02 -5.6235068e+00 -5.4217897e+00 -5.2229109e+00 -5.0194032e+00
1.1802400e+02 -5.6231104e+00 -5.4175964e+00 -5.2157760e+00 -5.0099325e+00
1.1802400e+02 -5.6235883e+00 -5.4141783e+00 -5.2091362e+00 -5.0005931e+00
1.1802500e+02 -5.6249357e+00 -5.4115346e+00 -5.2029913e+00 -4.9913869e+00
1.1802600e+02 -5.6271388e+00 -5.4096582e+00 -5.1973382e+00 -4.9823165e+00
1.1802600e+02 -5.6301750e+00 -5.4085355e+00 -5.1921708e+00 -4.9733848e+00
1.1802700e+02 -5.6340127e+00 -5.4081466e+00 -5.1874802e+00 -4.9645948e+00
1.1802700e+02 -5.6386124e+00 -5.4084653e+00 -5.1832546e+00 -4.9559503e+00
1.1802800e+02 -5.6439264e+00 -5.4094596e+00 -5.1794797e+00 -4.9474550e+00
1.1802900e+02 -5.6498999e+00 -5.4110916e+00 -5.1761380e+00 -4.9391127e+00
1.1802900e+02 -5.6564714e+00 -5.4133183e+00 -5.1732096e+00 -4.9309273e+00
1.1803000e+02 -5.6635733e+00 -5.4160913e+00 -5.1706720e+00 -4.9229024e+00
1.1803100e+02 -5.6711330e+00 -5.4193580e+00 -5.1684999e+00 -4.9150414e+00
1.1803100e+02 -5.6790736e+00 -5.4230614e+00 -5.1666656e+00 -4.9073468e+00
1.1803200e+02 -5.6873146e+00 -5.4271408e+00 -5.1651390e+00 -4.8998204e+00
1.1803200e+02 -5.6957733e+00 -5.4315324e+00 -5.1638874e+00 -4.8924628e+00
1.1803300e+02 -5.7043654e+00 -5.4361698e+00 -5.1628761e+00 -4.8852733e+00
1.1803400e+02 -5.7130062e+00 -5.4409846e+00 -5.1620681e+00 -4.8782498e+00
1.1803400e+02 -5.7216115e+00 -5.4459069e+00 -5.1614243e+00 -4.8713884e+00

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