Created Subsystem.loadData class to facilitate loading MoorDyn

results into a subsystem. It has a line_IDs argument to specify
the MoorDyn line numbers that correspond to the lineList.

moorpy/line.py

@@ -77,7 +77,7 @@ def __init__(self, mooringSys, num, L, lineType, nSegs=100, cb=0, isRod=0, attac
         self.fCurrent = np.zeros(3)  # total current force vector on the line [N]
 
 
-    def loadData(self, dirname, rootname, sep='.MD.'):
+    def loadData(self, dirname, rootname, sep='.MD.', id=0):
         '''Loads line-specific time series data from a MoorDyn output file'''
 
         self.qs = 0 # signals time series data
@@ -86,8 +86,11 @@ def loadData(self, dirname, rootname, sep='.MD.'):
             strtype='Rod'
         elif self.isRod==0:
             strtype='Line'
-
-        filename = dirname+rootname+sep+strtype+str(self.number)+'.out'
+
+        if id==0:
+            id = self.number
+
+        filename = dirname+rootname+sep+strtype+str(id)+'.out'
 
         if path.exists(filename):
 

moorpy/subsystem.py

@@ -570,4 +570,23 @@ def calcCurvature(self):
         self.Ks = curvature
 
         return curvature
-
+
+
+    def loadData(self, dirname, rootname, line_IDs):
+        '''Load data from MoorDyn into the Subsystem lineList.
+        
+        dirname 
+            folder where output files are located
+        rootname
+            root name of the OpenFAST primary file (.fst)
+        line_IDs : list
+            list of the line numbers (of MoorDyn) that correspond to the 
+            lineList. These are the numbers of the line.out file to load.
+        
+        '''
+
+        self.qs = 0  # indicate this Subsystem is reading in MoorDyn data
+
+        for i, line in enumerate(self.lineList):
+            line.loadData(dirname, rootname, line_IDs[i])
+