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### Information
- **Qiskit Terra version**: 0.14.1
- **Python version**: 3.7.6
- **Operating system**: Ubuntu 16.04
### What is the current behavior?
When trying to draw a `QuantumCir…
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In many cases, systems of ordinary differential equations can be separated into a linear and a nonlinear part. This is often encountered in structural dynamics, where an otherwise ideal, elastic struc…
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When I use dsolve() like this, I get an error in the last
How can I solve it, thank you！
```
import sympy as sy
u1_t = 0 # u_0=0
u2_t = 0 # u_0=0
def differential_equation_x1(t, x_1, x_2, …
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https://github.com/forestgeo/Climate/tree/master/Climate_Data/Met_Stations/SCBI
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**Submitting author:** @bjodah (Björn Dahlgren)
**Repository:** https://github.com/bjodah/pyneqsys
**Version:** v0.5.1
**Editor:** @arfon
**Reviewer:** @andim
**Archive:** 10.5281/zenodo.1156898
…
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I have a very weird segmentation fault in one of my simulations. The curios thing is that I do multiple simulations in exactly the same manner and the only thing I change between different simulations…
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I am trying to track down what I think may be a bug in SOFA regarding polar motion. In their function Pvtob(), they do the standard rotation of the Earth by xp around the y axis and then yp around the…
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**Submitting author:** @99991 (Thomas Germer)
**Repository:** https://github.com/pymatting/pymatting
**Version:** v1.0.6
**Editor:** @gkthiruvathukal
**Reviewers:** @ziatdinovmax, @macrocosme
**Manag…
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Currently the Transform is not considered the ssot for position, rotation, and scale (based on the comments in transform.rs). However in the examples (3d_scene, load_model) translation and rotation fo…
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I was trying to determine the optimal lag for a VAR model of mine but I encountered into a linear algebra error.
When I try to run this
```
var = VAR(data)
var.select_order()
```
I get this error t…