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[henry <question658514@xxxxxxxxxxxxxxxxxxxxx>]

New question #658514 on Yade:
https://answers.launchpad.net/yade/+question/658514

Trying to plot graphs of forces surface displacement, total displacement and the force at the left of the box. Nothing was displaced in the graph and i get the error message : "Missing columns in plot.data, adding NaN:  tDspl". Please help me debug the error.  Am new to yade. 

The script is attached .


from yade import pack
from math import *
from yade import plot
from yade import qt


gravity = 100

#box dimensions
widthl = .3
widthr = .3
widthc = .3
height = .3
thick  = .1
deep  = -.2

#size of grains
sizeMin = 40e-3
sizeMax = 60e-3

frictionAngle = .5
young = 1e8  #stiffness
poisson = 10

dt = 1e-3 #time step
nGravityDeposition = 250 #how long to run initial gravity deposition
nCycles = 3 #how many jumps to run afterwards
nStepsBetweenCycles = 200 #number of times steps between jumps
dspl = 20e-3 

#how much larger the initial make cloud box should be 
fillBoxHFactor = 3

from yade import polyhedra_utils

width = widthl +  widthc + widthr

#mat
mat = PolyhedraMat(young=young,poisson=10,frictionAngle=frictionAngle)
O.materials.append(mat)

def computeSurfaceDisplacement():
	vertices = []
	for b in O.bodies:
	 	if not isinstance(b.shape,Polyhedra): continue
	 	pos = b.state.pos
	 	ori = b.state.ori
	 	vs = b.shape.v
	 	vs = [pos + ori*v for v in vs]
	 	vertices.extend(vs)
	 	maxZ = max(v[2] for v in vertices)
	 	return maxZ


def plotAddData():
	sd = computeSurfaceDisplacement()
	plot.addData(
		i = O.iter,
		tDspl = O.bodies[1].state.displ(),
		fLeft = sum(O.forces.f(id)[2] for id in (2,3)),
		surfDspl = sd,
		)
	plot.plots = {'i':'surfDspl','i':'fLeft','i':'tDspl'}
#################################

#engines
O.engines=[
   ForceResetter(),
   InsertionSortCollider([Bo1_Polyhedra_Aabb(),Bo1_Facet_Aabb()]),
   InteractionLoop(
      [Ig2_Polyhedra_Polyhedra_PolyhedraGeom(), Ig2_Facet_Polyhedra_PolyhedraGeom()],
      [Ip2_PolyhedraMat_PolyhedraMat_PolyhedraPhys()],
      [Law2_PolyhedraGeom_PolyhedraPhys_Volumetric()],
   ),
   NewtonIntegrator(damping=0.4,gravity=(0,0,-gravity)),
 #commnet out the original PyRunner, replace with new one
 #PyRunner(iterPeriod=1,command='checker()'),
 PyRunner(iterPeriod = 10,command='plotAddData()'),
]

O.dt = dt

def moveBottom():
 v = dspl / O.dt
 for b in movables:
  b.state.vel = (0,0,-v)
def stopBottom():
 for b in movables:
  b.state.vel = (0,0,0)
def checker():
 for i in range(nCycles):
  ii = nGravityDeposition+i*nStepsBetweenCycles
  if O.iter == ii:
   moveBottom()
  if O.iter == ii+1:
   stopBottom()
 if O.iter == nGravityDeposition+nCycles*nStepsBetweenCycles:
  O.pause()


# box
p000 = Vector3(0,0,0)
p100 = Vector3(widthl,0,0)
p200 = Vector3(widthl+widthc,0,0)
p300 = Vector3(widthl+widthc+widthr,0,0)
pxs = (p000,p100,p200,p300)
p001,p101,p201,p301 = [p+Vector3(0,0,height) for p in pxs]
p010,p110,p210,p310 = [p+Vector3(0,thick,0) for p in pxs]
p011,p111,p211,p311 = [p+Vector3(0,thick,height) for p in pxs]
p00b,p10b,p20b,p30b = [p+Vector3(0,0,deep) for p in pxs]
p01b,p11b,p21b,p31b = [p+Vector3(0,thick,deep) for p in pxs]

def rect(vs,**kw):
 v1,v2,v3,v4 = vs
 return [
  facet((v1,v2,v3),**kw),
  facet((v1,v3,v4),**kw),
 ]

movables = rect((p100,p200,p210,p110)) # bottom center
rects = (
 (p000,p100,p110,p010), # bottom left
 (p200,p300,p310,p210), # bottom left
 (p000,p010,p011,p001), # left
 (p300,p310,p311,p301), # right
 (p000,p100,p101,p001), # front left
 (p100,p200,p201,p101), # front center
 (p200,p300,p301,p201), # front right
 (p010,p110,p111,p011), # back left
 (p110,p210,p211,p111), # back center
 (p210,p310,p311,p211), # back right
 (p100,p200,p20b,p10b), # front center below
 (p110,p210,p21b,p11b), # back center below
 (p100,p110,p11b,p10b), # left below
 (p200,p210,p21b,p20b), # right below
)
rects = movables + sum((rect(r) for r in rects),[])
O.bodies.append(rects)

# gravel
polyhedra_utils.fillBox((0,0,0),(width,thick,fillBoxHFactor*height),mat,sizemin=3*[sizeMin],sizemax=3*[sizeMax],seed=1)
###########


Thank you,
Henry 

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