SimPEG.MT Mergify.

Merge branch 'move2Simpeg' of https://github.com/simpeg/simpegmt into mt/dev

Conflicts:
	.gitignore
	.travis.yml
	LICENSE
	docs/conf.py
	docs/index.rst
	requirements.txt
	setup.py

tests/mt/test_ApparentResistivityAnalytic.py

@@ -0,0 +1,48 @@
+import unittest
+from SimPEG import *
+from SimPEG import MT
+
+TOL = 1e-6
+
+def appResPhs(freq,z):
+    app_res = ((1./(8e-7*np.pi**2))/freq)*np.abs(z)**2
+    app_phs = np.arctan2(-z.imag,z.real)*(180/np.pi)
+    return app_res, app_phs
+
+def appResNorm(sigmaHalf):
+    nFreq = 26
+
+    m1d = Mesh.TensorMesh([[(100,5,1.5),(100.,10),(100,5,1.5)]], x0=['C'])
+    sigma = np.zeros(m1d.nC) + sigmaHalf
+    sigma[m1d.gridCC[:]>200] = 1e-8
+
+    # Calculate the analytic fields
+    freqs = np.logspace(4,-4,nFreq)
+    Z = []
+    for freq in freqs:
+        Ed, Eu, Hd, Hu = MT.Utils.getEHfields(m1d,sigma,freq,np.array([200]))
+        Z.append((Ed + Eu)/(Hd + Hu))
+
+    Zarr = np.concatenate(Z)
+
+    app_r, app_p = appResPhs(freqs,Zarr)
+
+    return np.linalg.norm(np.abs(app_r - np.ones(nFreq)/sigmaHalf)) / np.log10(sigmaHalf)
+
+
+class TestAnalytics(unittest.TestCase):
+
+    def setUp(self):
+        pass
+    def test_appRes2en1(self):self.assertLess(appResNorm(2e-1), TOL)
+    def test_appRes2en2(self):self.assertLess(appResNorm(2e-2), TOL)
+    def test_appRes2en3(self):self.assertLess(appResNorm(2e-3), TOL)
+    def test_appRes2en4(self):self.assertLess(appResNorm(2e-4), TOL)
+    def test_appRes2en5(self):self.assertLess(appResNorm(2e-5), TOL)
+    def test_appRes2en6(self):self.assertLess(appResNorm(2e-6), TOL)
+
+
+
+
+if __name__ == '__main__':
+    unittest.main()