preliminary version of taylor diagram is added

taylordig.py

+import numpy as np
+import matplotlib.pyplot as plt
+import math
+
+X=np.arange(0.0,2.1,0.001)
+Y=np.arange(0.0,2.1,0.001)
+
+print X.shape 
+
+print Y.shape
+
+nx=X.shape[0]
+ny=Y.shape[0]
+
+h = np.zeros((ny,nx),dtype=np.float32)
+
+for j in range(ny):
+    for i in range(nx):
+        h[j,i] = math.sqrt(X[i] * X[i] + Y[j] * Y[j])
+
+fig=plt.figure(num=1,figsize=(12.0,6.0),dpi=300,facecolor='w',edgecolor='k')
+ax = fig.add_axes([0.08, 0.08, 0.8, 0.8], axisbg = '1.0')
+ax.set_xlabel('RMS/OBS_STD',fontsize='20',weight='bold')
+ax.set_ylabel ('RMS/OBS_STD',fontsize='20',weight='bold')
+ax.grid(False)
+vc=np.arange(0.0,2.2,0.2)
+
+ax.contour(X,Y,h,vc,colors='0.5')
+#ax.spines['top'].set_visible(False)
+#ax.spines['right'].set_visible(False)
+ax.set_xlim(0.0,2.0)
+ax.set_ylim(0.0,2.0)
+
+radius = np.arange(0.0,5.0,0.5)
+xangle = [1.0,0.99,0.95] + list(np.arange(0.9,-0.1,-0.1))
+
+#print xangle
+
+for ang in xangle:
+    print ang, math.degrees(math.acos(ang))
+
+for rd in radius:  
+    for ang in xangle:
+        #print math.cos(math.acos(ang))
+        if ang == 0.99 or ang == 0.95:
+            ax.plot([0.0,rd*math.cos(math.acos(ang))],[0.0,rd*math.sin(math.acos(ang))],'k-',lw="0.0")
+        else:
+            ax.plot([0.0,rd*math.cos(math.acos(ang))],[0.0,rd*math.sin(math.acos(ang))],'k-',lw="0.25")
+        
+
+ax.plot(0.2*math.cos(math.acos(0.5)),0.2*math.sin(math.acos(0.5)),'ob',ms=3)
+
+plt.savefig("taylor.png", bbox_inches='tight',dpi=300,facecolor='w',edgecolor='w',orientation='portrait')
+
+plt.close(1)
+