Timeline for NDSolve warning: step size is effectively zero
Current License: CC BY-SA 4.0
7 events
| when toggle format | what | by | license | comment | |
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| Jun 20, 2020 at 11:15 | history | edited | surujjd | CC BY-SA 4.0 |
added 7 characters in body
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| Jun 20, 2020 at 10:47 | comment | added | Alex Trounev |
@surujjd Let check coefficients of your system: there are $10^{108}$ in eqna , $10^{118}$ in eqnb and eqnd. How we can handle this with numerical methods?
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| Jun 20, 2020 at 8:51 | comment | added | surujjd | Oh I see. But I got the plot(may be through extrapolation), though not the correct one as expected. I don't see any singularity at t=-60. I was trying to solve a physics problem: evolution of some quantities such as scale factor of the Universe, some quantum fields etc. with time(conformal time). I didn't get the result as required. Earlier I was trying to do the same problem in a different variable(physical time), but I think computation was too heavy there large range. | |
| Jun 19, 2020 at 23:20 | history | edited | m_goldberg | CC BY-SA 4.0 |
edited tags; improved formatting
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| Jun 19, 2020 at 23:06 | history | edited | m_goldberg |
edited tags
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| Jun 19, 2020 at 21:01 | comment | added | MarcoB | Regarding the second error: notice that the results from NDSolve are interpolating functions with a domain $[-60, -60]$, i.e. the integration did not proceed at all, and the only value available is -60. Is your system stiff? Do you have a singularity at t=-60? This is a pretty common problem: what have you tried specifically (with code) and what was the result? | |
| Jun 19, 2020 at 20:28 | history | asked | surujjd | CC BY-SA 4.0 |