Result of SimPEG hackathon

- Incorporate field class on DC
- Add IP forward modelling and inversion
- Modify notebooks
- change folder name form simpegDC to simpegDCIP

simpegDCIP/Tests/test_forward_IPproblem.py

@@ -0,0 +1,57 @@
+import unittest
+import simpegDC as DC
+from SimPEG import *
+from pymatsolver import MumpsSolver
+
+class IPforwardTests(unittest.TestCase):
+
+    def test_IPforward(self):
+ 
+		cs = 12.5
+		nc = 500/cs+1
+		hx = [(cs,7, -1.3),(cs,nc),(cs,7, 1.3)]
+		hy = [(cs,7, -1.3),(cs,int(nc/2+1)),(cs,7, 1.3)]
+		hz = [(cs,7, -1.3),(cs,int(nc/2+1))]
+		mesh = Mesh.TensorMesh([hx, hy, hz], 'CCN')
+		sighalf = 1e-2
+		sigma = np.ones(mesh.nC)*sighalf
+		p0 = np.r_[-50., 50., -50.]
+		p1 = np.r_[ 50.,-50., -150.]
+		blk_ind = Utils.ModelBuilder.getIndecesBlock(p0, p1, mesh.gridCC)
+		sigma[blk_ind] = 1e-3
+		eta = np.zeros_like(sigma)
+		eta[blk_ind] = 0.1
+		sigmaInf = sigma.copy()
+		sigma0 = sigma*(1-eta)
+
+		nElecs = 11
+		x_temp = np.linspace(-250, 250, nElecs)
+		aSpacing = x_temp[1]-x_temp[0]
+		y_temp = 0.
+		xyz = Utils.ndgrid(x_temp, np.r_[y_temp], np.r_[0.])
+		srcList = DC.Examples.WennerArray.getSrcList(nElecs,aSpacing)
+		survey = DC.SurveyDC(srcList)
+
+		imap   = Maps.IdentityMap(mesh)
+		problem = DC.ProblemDC_CC(mesh, mapping= imap )
+		problem.Solver = MumpsSolver
+		problem.pair(survey)
+		
+		phi0 = survey.dpred(sigma0)
+		phiInf = survey.dpred(sigmaInf)
+
+		phiIP_true = phi0-phiInf
+
+		surveyIP = DC.SurveyIP(srcList)
+		problemIP = DC.ProblemIP(mesh, sigma=sigma)
+		problemIP.pair(surveyIP)
+		problemIP.Solver = MumpsSolver
+		phiIP_approx = surveyIP.dpred(eta)
+
+		err =  np.linalg.norm(phiIP_true-phiIP_approx) / np.linalg.norm(phiIP_true)
+		
+		self.assertTrue(err < 0.02)
+
+
+if __name__ == '__main__':
+    unittest.main()