PRMS-Python
diff --git a/‎prms_python/data.py‎
Lines changed: 2 additions & 2 deletions b/‎prms_python/data.py‎
Lines changed: 2 additions & 2 deletions
diff --git a/‎prms_python/optimizer.py‎
Lines changed: 9 additions & 2 deletions b/‎prms_python/optimizer.py‎
Lines changed: 9 additions & 2 deletions
diff --git a/‎prms_python/util.py‎
Lines changed: 4 additions & 2 deletions b/‎prms_python/util.py‎
Lines changed: 4 additions & 2 deletions
@@ -17,7 +17,7 @@ class Data(object):
     """
     Object that reads the PRMS data file and loads it into a date-time indexed
     DataFrame for data management, analysis and visualization. The ``modify`` 
-    method allow for inplace modification of one or more time series inputs in the 
+    method allows for inplace modification of one or more time series inputs in the 
     data file based on a user defined function. The ``write`` method reformats the 
     Dataframe to PRMS text format and writes a new data file to disk.  Here is an
     example of loading a data file, modifying the temperature inputs ('tmin' and 
@@ -30,7 +30,7 @@ class Data(object):
     >>> d.modify(f,['tmax','tmin'])
     >>> d.write('example_modified_data_file')
 
-    d is a Data instance of the example data file, calling 
+    d is a Data instance of example_data_file, calling 
 
     >>> d.DataFrame 
 
 
@@ -35,6 +35,10 @@ class Optimizer:
     >>> optr.srad('path/to/reference_data/measured_srad.csv', srad_hru)
 
     '''
+    
+    ## constant attributes for allowable range of solrad parameters
+    dday_int = (-60.0, 10.0)
+    dday_slope = (0.2, 0.9)
 
     def __init__(self, parameters, data, control_file, working_dir,
                  title=None, description=None):
@@ -50,12 +54,15 @@ def __init__(self, parameters, data, control_file, working_dir,
         else:
             raise TypeError('data must be instance of Data')
 
+        if not os.path.isdir(working_dir):
+            os.mkdir(working_dir)
+
         self.control_file = control_file
         self.working_dir = working_dir
         self.title = title
         self.description = description
 
-    def srad(self, reference_srad_path, station_nhru, method='',
+    def srad(self, reference_srad_path, station_nhru, method='', 
              dday_intcp_range=None, dday_slope_range=None,
              intcp_delta=None, slope_delta=None, nproc=None):
         '''
@@ -134,7 +141,7 @@ def _error(x, y):
             (
                 output['simulation_dir'],
                 _error(measured_srad,
-                       output['statvar']['swrad ' + str(station_nhru)])
+                       output['statvar']['swrad_' + str(station_nhru)])
             )
 
             for output in outputs
 
@@ -70,8 +70,10 @@ def load_statvar(statvar_file):
 def load_data_file(data_file):
     """
     Read the data file and load into a datetime indexed Pandas dataframe object
-    INPUT: data_file = data file path (string)
-    OUTPUT: df = Pandas dataframe of input time series data from data file with datetime index
+    Arguments: 
+	data_file (string): data file path 
+    Returns:
+	df (pandas.DataFrame): Pandas dataframe of input time series data from data file with datetime index
     """
     # valid input time series that can be put into a data file
     valid_input_variables = ('gate_ht',