diff --git a/workflows/pca_workflow.py b/workflows/pca_workflow.py
index 66cd099..45a8848 100644
--- a/workflows/pca_workflow.py
+++ b/workflows/pca_workflow.py
@@ -98,7 +98,7 @@ class PCAFunction(Function):
         
         T = dataset.Dataset(T,[('samples',col_ids) ,comp_def])
         P = dataset.Dataset(P,[('genes',row_ids),comp_def])
-        E = dataset.Dataset(E,[('samples',col_ids),'genes',(row_ids)])
+        E = dataset.Dataset(E,[('samples',col_ids),('genes',row_ids)])
         #tsq = dataset.Dataset(tsq,[singel_def,data_ids[1])
         
         ## plots
@@ -252,6 +252,9 @@ class Log2Function(Function):
 
     def run(self,data):
         x = log2(data._array)
-        ids = data.get_identifiers()
+        #pull out identifiers
+        ids = []
+        for dim in data.get_dim_names():
+            ids.append((dim,data.get_identifiers(dim)))
         return [dataset.Dataset(x,identifiers=ids,name='Log2_X')]
 PCAWorkflow.name = 'PCA Workflow'