I am currently working on a PR to modify the mechanics core - #2412. The
Travis build seems to be failing for a couple of doctests in
the doc/src/modules/physics/mechanics/bicycle_example.rst file. Have a look
here - https://travis-ci.org/sympy/sympy/jobs/11069792
The problem is, neither Gilbert nor I are able to figure out why. The
weirder stuff is, doing
./bin/doctest -n doc/src/modules/physics/mechanics/bicycle_example.rst
on my machine gives no error once, and 5 errors the next time I run it
(Without altering any code in the meantime). Same goes for the command
without the '-n' parameter.
Can anybody help us out with this? The PR is stuck at this issue, and we
need to resolve it soon. (I have attached a file with the errors shown)
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sachin@sachin-Inspiron-5520:~/sympyrepo/sympy$ ./bin/doctest
doc/src/modules/physics/mechanics/bicycle_example.rst
============================== rst doctests start ==============================
executable: /usr/bin/python (2.7.3-final-0) [CPython]
architecture: 64-bit
cache: yes
ground types: python
hash randomization: on (PYTHONHASHSEED=1313832924)
epo/sympy/doc/src/modules/physics/mechanics/bicycle_example.rst [88] [OK]
sachin@sachin-Inspiron-5520:~/sympyrepo/sympy$ ./bin/doctest
doc/src/modules/physics/mechanics/bicycle_example.rst
**********************************************************************
File
"/home/sachin/sympyrepo/sympy/doc/src/modules/physics/mechanics/bicycle_example.rst",
line 109, in bicycle_example.rst
Failed example:
Steer.v2pt_theory(WR_mc, N, Frame)
Expected:
WRrad*(u1*sin(q2) + u3 + u4)*R.x - WRrad*u2*R.y + framelength*(u1*sin(q2) +
u4)*Frame.x - framelength*(-u1*sin(htangle + q4)*cos(q2) + u2*cos(htangle +
q4))*Frame.y
Got:
WRrad*(u1*sin(q2) + u3 + u4)*R.x - WRrad*u2*R.y +
framelength*((-(-sin(q2)*sin(q5) + cos(htangle + q4)*cos(q2)*cos(q5))*sin(q5) +
(sin(q2)*cos(q5) + sin(q5)*cos(htangle + q4)*cos(q2))*cos(q5))*u1 + u4)*Frame.x
- framelength*(-u1*sin(htangle + q4)*cos(q2) + u2*cos(htangle + q4))*Frame.y
**********************************************************************
File
"/home/sachin/sympyrepo/sympy/doc/src/modules/physics/mechanics/bicycle_example.rst",
line 111, in bicycle_example.rst
Failed example:
Frame_mc.v2pt_theory(WR_mc, N, Frame)
Expected:
WRrad*(u1*sin(q2) + u3 + u4)*R.x - WRrad*u2*R.y + framecg3*(u1*sin(q2) +
u4)*Frame.x + (-framecg1*(u1*cos(htangle + q4)*cos(q2) + u2*sin(htangle + q4))
- framecg3*(-u1*sin(htangle + q4)*cos(q2) + u2*cos(htangle + q4)))*Frame.y +
framecg1*(u1*sin(q2) + u4)*Frame.z
Got:
WRrad*(u1*sin(q2) + u3 + u4)*R.x - WRrad*u2*R.y +
framecg3*((-(-sin(q2)*sin(q5) + cos(htangle + q4)*cos(q2)*cos(q5))*sin(q5) +
(sin(q2)*cos(q5) + sin(q5)*cos(htangle + q4)*cos(q2))*cos(q5))*u1 + u4)*Frame.x
+ (-framecg1*(((-sin(q2)*sin(q5) + cos(htangle + q4)*cos(q2)*cos(q5))*cos(q5) +
(sin(q2)*cos(q5) + sin(q5)*cos(htangle + q4)*cos(q2))*sin(q5))*u1 +
u2*sin(htangle + q4)) - framecg3*(-u1*sin(htangle + q4)*cos(q2) +
u2*cos(htangle + q4)))*Frame.y + framecg1*((-(-sin(q2)*sin(q5) + cos(htangle +
q4)*cos(q2)*cos(q5))*sin(q5) + (sin(q2)*cos(q5) + sin(q5)*cos(htangle +
q4)*cos(q2))*cos(q5))*u1 + u4)*Frame.z
**********************************************************************
File
"/home/sachin/sympyrepo/sympy/doc/src/modules/physics/mechanics/bicycle_example.rst",
line 113, in bicycle_example.rst
Failed example:
Fork_mc.v2pt_theory(Steer, N, Fork)
Expected:
WRrad*(u1*sin(q2) + u3 + u4)*R.x - WRrad*u2*R.y + framelength*(u1*sin(q2) +
u4)*Frame.x - framelength*(-u1*sin(htangle + q4)*cos(q2) + u2*cos(htangle +
q4))*Frame.y + forkcg3*((sin(q2)*cos(q5) + sin(q5)*cos(htangle +
q4)*cos(q2))*u1 + u2*sin(htangle + q4)*sin(q5) + u4*cos(q5))*Fork.x +
(-forkcg1*((-sin(q2)*sin(q5) + cos(htangle + q4)*cos(q2)*cos(q5))*u1 +
u2*sin(htangle + q4)*cos(q5) - u4*sin(q5)) - forkcg3*(-u1*sin(htangle +
q4)*cos(q2) + u2*cos(htangle + q4) + u5))*Fork.y + forkcg1*((sin(q2)*cos(q5) +
sin(q5)*cos(htangle + q4)*cos(q2))*u1 + u2*sin(htangle + q4)*sin(q5) +
u4*cos(q5))*Fork.z
Got:
WRrad*(u1*sin(q2) + u3 + u4)*R.x - WRrad*u2*R.y +
framelength*((-(-sin(q2)*sin(q5) + cos(htangle + q4)*cos(q2)*cos(q5))*sin(q5) +
(sin(q2)*cos(q5) + sin(q5)*cos(htangle + q4)*cos(q2))*cos(q5))*u1 + u4)*Frame.x
- framelength*(-u1*sin(htangle + q4)*cos(q2) + u2*cos(htangle + q4))*Frame.y +
forkcg3*((sin(q2)*cos(q5) + sin(q5)*cos(htangle + q4)*cos(q2))*u1 +
u2*sin(htangle + q4)*sin(q5) + u4*cos(q5))*Fork.x +
(-forkcg1*((-sin(q2)*sin(q5) + cos(htangle + q4)*cos(q2)*cos(q5))*u1 +
u2*sin(htangle + q4)*cos(q5) - u4*sin(q5)) - forkcg3*(-u1*sin(htangle +
q4)*cos(q2) + u2*cos(htangle + q4) + u5))*Fork.y + forkcg1*((sin(q2)*cos(q5) +
sin(q5)*cos(htangle + q4)*cos(q2))*u1 + u2*sin(htangle + q4)*sin(q5) +
u4*cos(q5))*Fork.z
**********************************************************************
File
"/home/sachin/sympyrepo/sympy/doc/src/modules/physics/mechanics/bicycle_example.rst",
line 115, in bicycle_example.rst
Failed example:
WF_mc.v2pt_theory(Steer, N, Fork)
Expected:
WRrad*(u1*sin(q2) + u3 + u4)*R.x - WRrad*u2*R.y + framelength*(u1*sin(q2) +
u4)*Frame.x - framelength*(-u1*sin(htangle + q4)*cos(q2) + u2*cos(htangle +
q4))*Frame.y + forkoffset*((sin(q2)*cos(q5) + sin(q5)*cos(htangle +
q4)*cos(q2))*u1 + u2*sin(htangle + q4)*sin(q5) + u4*cos(q5))*Fork.x +
(forklength*((-sin(q2)*sin(q5) + cos(htangle + q4)*cos(q2)*cos(q5))*u1 +
u2*sin(htangle + q4)*cos(q5) - u4*sin(q5)) - forkoffset*(-u1*sin(htangle +
q4)*cos(q2) + u2*cos(htangle + q4) + u5))*Fork.y - forklength*((sin(q2)*cos(q5)
+ sin(q5)*cos(htangle + q4)*cos(q2))*u1 + u2*sin(htangle + q4)*sin(q5) +
u4*cos(q5))*Fork.z
Got:
WRrad*(u1*sin(q2) + u3 + u4)*R.x - WRrad*u2*R.y +
framelength*((-(-sin(q2)*sin(q5) + cos(htangle + q4)*cos(q2)*cos(q5))*sin(q5) +
(sin(q2)*cos(q5) + sin(q5)*cos(htangle + q4)*cos(q2))*cos(q5))*u1 + u4)*Frame.x
- framelength*(-u1*sin(htangle + q4)*cos(q2) + u2*cos(htangle + q4))*Frame.y +
forkoffset*((sin(q2)*cos(q5) + sin(q5)*cos(htangle + q4)*cos(q2))*u1 +
u2*sin(htangle + q4)*sin(q5) + u4*cos(q5))*Fork.x +
(forklength*((-sin(q2)*sin(q5) + cos(htangle + q4)*cos(q2)*cos(q5))*u1 +
u2*sin(htangle + q4)*cos(q5) - u4*sin(q5)) - forkoffset*(-u1*sin(htangle +
q4)*cos(q2) + u2*cos(htangle + q4) + u5))*Fork.y - forklength*((sin(q2)*cos(q5)
+ sin(q5)*cos(htangle + q4)*cos(q2))*u1 + u2*sin(htangle + q4)*sin(q5) +
u4*cos(q5))*Fork.z
**********************************************************************
File
"/home/sachin/sympyrepo/sympy/doc/src/modules/physics/mechanics/bicycle_example.rst",
line 117, in bicycle_example.rst
Failed example:
WF_cont.v2pt_theory(WF_mc, N, WF)
Expected:
WRrad*(u1*sin(q2) + u3 + u4)*R.x - WRrad*u2*R.y + framelength*(u1*sin(q2) +
u4)*Frame.x - framelength*(-u1*sin(htangle + q4)*cos(q2) + u2*cos(htangle +
q4))*Frame.y + (-WFrad*(sin(q2)*cos(q5) + sin(q5)*cos(htangle +
q4)*cos(q2))*((-sin(q2)*sin(q5) + cos(htangle + q4)*cos(q2)*cos(q5))*u1 +
u2*sin(htangle + q4)*cos(q5) - u4*sin(q5))/sqrt((-sin(q2)*cos(q5) -
sin(q5)*cos(htangle + q4)*cos(q2))*(sin(q2)*cos(q5) + sin(q5)*cos(htangle +
q4)*cos(q2)) + 1) + forkoffset*((sin(q2)*cos(q5) + sin(q5)*cos(htangle +
q4)*cos(q2))*u1 + u2*sin(htangle + q4)*sin(q5) + u4*cos(q5)))*Fork.x +
(forklength*((-sin(q2)*sin(q5) + cos(htangle + q4)*cos(q2)*cos(q5))*u1 +
u2*sin(htangle + q4)*cos(q5) - u4*sin(q5)) - forkoffset*(-u1*sin(htangle +
q4)*cos(q2) + u2*cos(htangle + q4) + u5))*Fork.y + (WFrad*(sin(q2)*cos(q5) +
sin(q5)*cos(htangle + q4)*cos(q2))*(-u1*sin(htangle + q4)*cos(q2) +
u2*cos(htangle + q4) + u5)/sqrt((-sin(q2)*cos(q5) - sin(q5)*cos(htangle +
q4)*cos(q2))*(sin(q2)*cos(q5) + sin(q5)*cos(htangle + q4)*cos(q2)) + 1) -
forklength*((sin(q2)*cos(q5) + sin(q5)*cos(htangle + q4)*cos(q2))*u1 +
u2*sin(htangle + q4)*sin(q5) + u4*cos(q5)))*Fork.z -
WFrad*((-sin(q2)*sin(q5)*cos(htangle + q4) + cos(q2)*cos(q5))*u6 + u4*cos(q2) +
u5*sin(htangle + q4)*sin(q2))/sqrt((-sin(q2)*cos(q5) - sin(q5)*cos(htangle +
q4)*cos(q2))*(sin(q2)*cos(q5) + sin(q5)*cos(htangle + q4)*cos(q2)) + 1)*Y.x +
WFrad*(u2 + u5*cos(htangle + q4) + u6*sin(htangle +
q4)*sin(q5))/sqrt((-sin(q2)*cos(q5) - sin(q5)*cos(htangle +
q4)*cos(q2))*(sin(q2)*cos(q5) + sin(q5)*cos(htangle + q4)*cos(q2)) + 1)*Y.y
Got:
WRrad*(u1*sin(q2) + u3 + u4)*R.x - WRrad*u2*R.y +
framelength*((-(-sin(q2)*sin(q5) + cos(htangle + q4)*cos(q2)*cos(q5))*sin(q5) +
(sin(q2)*cos(q5) + sin(q5)*cos(htangle + q4)*cos(q2))*cos(q5))*u1 + u4)*Frame.x
- framelength*(-u1*sin(htangle + q4)*cos(q2) + u2*cos(htangle + q4))*Frame.y +
(-WFrad*(sin(q2)*cos(q5) + sin(q5)*cos(htangle +
q4)*cos(q2))*((-sin(q2)*sin(q5) + cos(htangle + q4)*cos(q2)*cos(q5))*u1 +
u2*sin(htangle + q4)*cos(q5) - u4*sin(q5))/sqrt((-sin(q2)*cos(q5) -
sin(q5)*cos(htangle + q4)*cos(q2))*(sin(q2)*cos(q5) + sin(q5)*cos(htangle +
q4)*cos(q2)) + 1) + forkoffset*((sin(q2)*cos(q5) + sin(q5)*cos(htangle +
q4)*cos(q2))*u1 + u2*sin(htangle + q4)*sin(q5) + u4*cos(q5)))*Fork.x +
(forklength*((-sin(q2)*sin(q5) + cos(htangle + q4)*cos(q2)*cos(q5))*u1 +
u2*sin(htangle + q4)*cos(q5) - u4*sin(q5)) - forkoffset*(-u1*sin(htangle +
q4)*cos(q2) + u2*cos(htangle + q4) + u5))*Fork.y + (WFrad*(sin(q2)*cos(q5) +
sin(q5)*cos(htangle + q4)*cos(q2))*(-u1*sin(htangle + q4)*cos(q2) +
u2*cos(htangle + q4) + u5)/sqrt((-sin(q2)*cos(q5) - sin(q5)*cos(htangle +
q4)*cos(q2))*(sin(q2)*cos(q5) + sin(q5)*cos(htangle + q4)*cos(q2)) + 1) -
forklength*((sin(q2)*cos(q5) + sin(q5)*cos(htangle + q4)*cos(q2))*u1 +
u2*sin(htangle + q4)*sin(q5) + u4*cos(q5)))*Fork.z -
WFrad*(((-sin(q2)*sin(q5)*cos(htangle + q4) + cos(q2)*cos(q5))*cos(q5) -
(-sin(q2)*cos(htangle + q4)*cos(q5) - sin(q5)*cos(q2))*sin(q5))*u4 +
(-sin(q2)*sin(q5)*cos(htangle + q4) + cos(q2)*cos(q5))*u6 + u5*sin(htangle +
q4)*sin(q2))/sqrt((-sin(q2)*cos(q5) - sin(q5)*cos(htangle +
q4)*cos(q2))*(sin(q2)*cos(q5) + sin(q5)*cos(htangle + q4)*cos(q2)) + 1)*Y.x +
WFrad*(u2 + u5*cos(htangle + q4) + u6*sin(htangle +
q4)*sin(q5))/sqrt((-sin(q2)*cos(q5) - sin(q5)*cos(htangle +
q4)*cos(q2))*(sin(q2)*cos(q5) + sin(q5)*cos(htangle + q4)*cos(q2)) + 1)*Y.y
**********************************************************************
1 items had failures:
5 of 88 in bicycle_example.rst
***Test Failed*** 5 failures.
============================== rst doctests start ==============================
executable: /usr/bin/python (2.7.3-final-0) [CPython]
architecture: 64-bit
cache: yes
ground types: python
hash randomization: on (PYTHONHASHSEED=3612625011)
epo/sympy/doc/src/modules/physics/mechanics/bicycle_example.rst [88] [5]
DO *NOT* COMMIT!
