updated plots and documentation

docs/examples/mesh/plot_TensorMesh.py

@@ -0,0 +1,21 @@
+import numpy as np
+import matplotlib.pyplot as plt
+from SimPEG import TensorMesh
+
+pad = 7
+padfactor = 1.4
+xpad = (np.ones(pad)*padfactor)**np.arange(pad)
+ypad = (np.ones(pad)*padfactor)**np.arange(pad)
+
+core = 15
+xcore = np.ones(core)
+ycore = np.ones(core)
+
+h1 = np.r_[xpad[::-1],xcore,xpad]
+h2 = np.r_[ypad[::-1],ycore,ypad]
+
+mesh = TensorMesh([h1, h2])
+mesh.plotGrid()
+plt.axis('tight')
+
+plt.show()