some improvements

rowers/interactiveplots.py

@@ -1185,7 +1185,6 @@ def interactive_cpchart(rower,thedistances,thesecs,theavpower,
     # fitting the data to three parameter CP model
     
 
-
     p1 = p0
     if len(thesecs)>=4:
 	p1, success = optimize.leastsq(errfunc, p0[:], args = (thesecs,theavpower))
@@ -1271,7 +1270,7 @@ def interactive_cpchart(rower,thedistances,thesecs,theavpower,
 
     if cpdata.empty:
         message = 'Calculations are running in the background. Please refresh this page to see updated results'
-        return ['','',paulslope,paulintercept,p1,message]
+        return ['','',paulslope,paulintercept,p1,message,p1wc]
         
     velo = cpdata['distance']/cpdata['delta']
 
@@ -1338,7 +1337,7 @@ def interactive_cpchart(rower,thedistances,thesecs,theavpower,
     script, div = components(plot)
 
     
-    return [script,div,paulslope,paulintercept,p1,message]
+    return [script,div,paulslope,paulintercept,p1,message,p1wc]
 
 def interactive_windchart(id=0,promember=0):
     # check if valid ID exists (workout exists)

rowers/metrics.py

@@ -343,11 +343,14 @@ def getagegrouprecord(age,sex='male',weightcategory='hwt',
             )
         )
 
-    ages = df['age']
-    powers = df['power']
+    if not df.empty:
+        ages = df['age']
+        powers = df['power']
 
-    poly_coefficients = np.polyfit(ages,powers,6)
+        poly_coefficients = np.polyfit(ages,powers,6)
 
-    power = np.polyval(poly_coefficients,age)
+        power = np.polyval(poly_coefficients,age)
+    else:
+        power = 0
 
     return power

rowers/templates/rankings.html

@@ -160,15 +160,21 @@
 
     {{ the_div|safe }}
 
-<p>The dashed lines are based on the Concept2 rankings for your age, gender
-  and weight category. World class means within 5% of World Record in terms
+{% if age %}
+<p>The dashed lines are based on the
+  <a href="https://log.concept2.com/rankings">Concept2</a>
+  rankings for your age, gender
+  and weight category. World class means within 5% of 
+  <a href="http://www.concept2.com/indoor-rowers/racing/records/world">
+    World Record</a> in terms
   of power. Excellent, Good, and Fair indicate the power levels of the top
   10%, 25% and 50% of the Concept2 rankings. Average is taken
-  as being in the top 75%, given that the Concept2 rankings probably
+  as being in the top 75%, which is quite good,
+  given that the Concept2 rankings probably
   represent the more competitive sub-group of all people who erg.
   Please note that this is a prediction for people of exactly your age,
   and your actual place in the Concept2 Ranking may be different.</p>
-
+{% endif %}
 </div>
 
 <div id="predictions" class="grid_12 alpha">

rowers/views.py

@@ -3543,7 +3543,6 @@ def rankings_view2(request,theuser=0,
             age = calculate_age(r.birthdate)
             durations = [1,4,30,60]
             distances = [100,500,1000,2000,5000,6000,10000,21097,42195]
-            print r.weightcategory,r.sex,age,'aap'
             for distance in distances:
                 worldclasspower = metrics.getagegrouprecord(
                     age,
@@ -3552,9 +3551,12 @@ def rankings_view2(request,theuser=0,
                     weightcategory=r.weightcategory
                 )
                 velo = (worldclasspower/2.8)**(1./3.)
-                duration = distance/velo
-                wcdurations.append(duration)
-                wcpower.append(worldclasspower)
+                try:
+                    duration = distance/velo
+                    wcdurations.append(duration)
+                    wcpower.append(worldclasspower)
+                except ZeroDivisionError:
+                    pass
             for duration in durations:
                 worldclasspower = metrics.getagegrouprecord(
                     age,
@@ -3562,12 +3564,16 @@ def rankings_view2(request,theuser=0,
                     duration=duration,
                     weightcategory=r.weightcategory
                     )
-                wcdurations.append(60.*duration)
-                velo = (worldclasspower/2.8)**(1./3.)
-                distance = int(60*duration*velo)
-                wcpower.append(worldclasspower)
+                try:
+                    velo = (worldclasspower/2.8)**(1./3.)
+                    distance = int(60*duration*velo)
+                    wcdurations.append(60.*duration)
+                    wcpower.append(worldclasspower)
+                except ValueError:
+                    pass
         else:
             worldclasspower = None
+            age = 0
             
 	result = request.user.is_authenticated() and ispromember(request.user)
 	if result:
@@ -3702,6 +3708,10 @@ def rankings_view2(request,theuser=0,
 	paulintercept = res[3]
 	p1 = res[4]
 	message = res[5]
+        try:
+            testcalc = float(pd.Series(res[6]))
+        except TypeError:
+            age = 0
     else:
 	script = ''
 	div = '<p>No ranking pieces found.</p>'
@@ -3840,6 +3850,9 @@ def rankings_view2(request,theuser=0,
 		   'deltaform':deltaform,
 		   'id': theuser,
 		   'theuser':uu,
+                   'age':age,
+                   'sex':r.sex,
+                   'weightcategory':r.weightcategory,
 		   'startdate':startdate,
 		   'enddate':enddate,
                    'teams':get_my_teams(request.user),