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Scipy-based Delay Differential Equation (DDE) solver

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Arrays need to be concatenated differently now (Python 3.9). Im not sure which is faster 1. inserting the historical value into the result list and then just returning the result...

The original code used the `+` operator to join the initial value and the integration resuslts. This led to incorrect array shapes and numpy treating the data inside as dtype=object....

Hi Zulko, firstly, thank you for writing ddeint!. I am trying to solve an initial value problem for the case that x''(t) is known and depends on x(t-dt). In scipy...

Hi Zulko, firstly, thank you for writing ddeint!. I want to solve 7 coupled differential equations with different delays (e.g., z1 = (Jd1d1 * Y1(t-d1) + Jd1d2 * Y2(t-d2) +...

Since numpy 1.19 a deprecation warning is raised at line 145, namely `VisibleDeprecationWarning: Creating an ndarray from ragged nested sequences (which is a list-or-tuple of lists-or-tuples-or ndarrays with different lengths...

Hi do you think it reasonable to enable the variable to be indexed?

Hi, I try to simulate FOPDT using ddeint. However, it doesn't work for me. May I have your advice on this? My system is as shown: ```python dxdt = (-x(t)+Kp*u(t-d))/taup...

Hi, I have a problem about the solution given by ddeint when time delay is set to zero. I expect in this case that the solution is the same as...

Correct numpy array orientation to match modern syntax and insert initial value at beginning. The function does not work without this.

I try to install the latest version 0.3 via [pyproject.toml](https://github.com/Zulko/ddeint/blob/master/pyproject.toml) and the latest released package, an error was raised: '[tool.poetry] section not found in /my/path/pyproject.toml'. Maybe this error happened beacause...