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[Question #683949]: particle position data


New question #683949 on Yade:

Hi all,

I have a question on the data for z position of particles.
I am trying to save z position for all particles in the simulation by using the code below and pyrunner.

for p in range(p_num):
       f1.write("%d\t%e\t%e\t%e\t%e\t%e\t%e\t%e\t%e\t%e\t%e\t%e\n" % (pkdID[p][0],p_mass[p][0],p_radii[p][0],x_pos[p][0],y_pos[p][0],z_pos[p][0],x_vel[p][0],y_vel[p][0],z_vel[p][0],x_ang[p][0],y_ang[p][0],z_ang[p][0]))

I've attached some part of data for one particle.

-57.5695100000000	-59.8987800000000	-62.2748500000000	-64.6975900000000	-67.1669000000000	-69.6826200000000	-72.2446200000000	-74.8527100000000	-77.5067100000000	-80.2064300000000	0.155653600000000	-82.9516500000000	-85.7421600000000	-88.5777200000000	-91.4581100000000	-94.3830700000000	-97.3523800000000	-100.365800000000	-103.423100000000	-106.524000000000	-109.668400000000	0.155660900000000	-112.855900000000	-116.086600000000	-119.360100000000

Here, the z position decreases. It makes sense because there is only force, gravity with a negative z direction. but it looks like having dumb data like 0.155653600000000. Do you have any ideas why I got these weird data? Also, these weird data look like having the same frequency for all particles. 

Thank you for your help in advance.

Jinny Kim

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