diff --git a/fluents/dataset.py b/fluents/dataset.py
index f9cbc96..4446dc8 100644
--- a/fluents/dataset.py
+++ b/fluents/dataset.py
@@ -383,6 +383,36 @@ class Selection(dict):
         self[axis] = labels
     
 
+def write_ftsv(fd, ds):
+    # Write header information
+    if isinstance(ds, CategoryDataset):
+        type = 'category'
+    elif isinstance(ds, GraphDataset):
+        type = 'network'
+    elif isinstance(ds, Dataset):
+        type = 'dataset'
+    else:
+        raise Exception("Unknown object")
+    print >> fd, "# type: %s" % type
+
+    for dim in ds.get_dim_name():
+        print >> fd, "# dimension: %s" % dim,
+        for id in ds.get_identifiers(dim, None, True):
+            print >> fd, id,
+        print >> fd
+
+    print >> fd, "# name: %s" % ds.get_name()
+    print >> fd
+
+    # Write data
+    m = ds.asarray()
+    y, x = m.shape
+    for j in range(y):
+        for i in range(x):
+            print >> fd, "%s\t" % m[j, i], 
+        print >> fd
+
+
 def read_ftsv(fd):
     split_re = re.compile('^#\s*(\w+)\s*:\s*(.+)')
     dimensions = []