twiss with coupled latice about ocelot

[sergey-tomin]

this is warning and it works on my laptop. anyway here must be checking to avoid divided by zero.

[iagapov]

divide by zero is not a 'warning'. The code works incorrectly, so this needs to be fixed.

[sergey-tomin]

divided by zero is error which crushs the code. Here is not this case see below

print M[2, 3]/M[2, 2]_m.beta_y - M[2, 3]_m.alpha_y, arctan(M[2, 3]/(M[2, 2]_m.beta_y - M[2, 3]_m.alpha_y))

5.45502412182 0.00111206462467
6.07237322199 0.00123637344116
/home/sergey/Dropbox/DESY/repository/ocelot/cpbd/optics.py:170: RuntimeWarning: divide by zero encountered in double_scalars
d_mux = arctan(M[0, 1]/(M[0, 0]_m.beta_x - M[0, 1]_m.alpha_x))
6.69011365804 0.00136045838756
7.30828567367 0.00148433007011

[iagapov]

stranhe. Why does devide by zero not cause code to crash. Anyway it has nothing to do with coupliong

[sergey-tomin]

done