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I think it's because the lists are initialized outside the compute
function, making them global variables. So when the next variance is computed it still contains the elements from the previous data set.
This can easily be solved by moving the initial empty lists inside the compute
function: IE:
instead of:
pxs, pys, vxs, vys, rhos, phis, rhodots = [], [], [], [], [], [], []
def compute(filename):
with open(filename, 'rt') as csvfile:
/** ... **/
change it to:
def compute(filename):
pxs, pys, vxs, vys, rhos, phis, rhodots = [], [], [], [], [], [], []
with open(filename, 'rt') as csvfile:
/** ... **/
Line 61 of Tools.cpp:
double phi_dot = (pxvx + pyvy) / phi;
The formula should be: phi_dot = (pxvx + pyvy) / rho
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