bindings_aba.py

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import unittest
 
import numpy as np
import pinocchio as pin
from test_case import PinocchioTestCase as TestCase
 
 
class TestABA(TestCase):
    def setUp(self):
        self.model = pin.buildSampleModelHumanoidRandom()
        self.data = self.model.createData()
 
        qmax = np.full((self.model.nq, 1), np.pi)
        self.q = pin.randomConfiguration(self.model, -qmax, qmax)
        self.v = np.random.rand(self.model.nv)
        self.ddq = np.random.rand(self.model.nv)
 
        self.fext = []
        for _ in range(self.model.njoints):
            self.fext.append(pin.Force.Random())
 
    def test_aba(self):
        model = self.model
        ddq = pin.aba(self.model, self.data, self.q, self.v, self.ddq)
 
        null_fext = pin.StdVec_Force()
        for _ in range(model.njoints):
            null_fext.append(pin.Force.Zero())
 
        ddq_null_fext = pin.aba(
            self.model, self.data, self.q, self.v, self.ddq, null_fext
        )
        self.assertApprox(ddq_null_fext, ddq)
 
        null_fext_list = []
        for f in null_fext:
            null_fext_list.append(f)
 
        print("size:", len(null_fext_list))
        ddq_null_fext_list = pin.aba(
            self.model, self.data, self.q, self.v, self.ddq, null_fext_list
        )
        self.assertApprox(ddq_null_fext_list, ddq)
 
    def test_computeMinverse(self):
        model = self.model
        Minv = pin.computeMinverse(model, self.data, self.q)
 
        data2 = model.createData()
        M = pin.crba(model, data2, self.q)
 
        self.assertApprox(np.linalg.inv(M), Minv)
 
 
if __name__ == "__main__":
    unittest.main()