added range specicification

src/scgenerator/variableparameters.py

@@ -316,6 +316,12 @@ def sequence_from_specs(
         return np.arange(start, stop + step, step)
     if kind == "linear":
         return np.linspace(start, stop, num)
+    elif kind == "range":  # stop -> step
+        try:
+            return np.arange(start, start + num * stop, stop)
+        except Exception as e:
+            e.add_note(f"Trying to build range sequence from {start=}, step={stop}, {num=}")
+            raise
     elif kind == "geometric":
         return np.geomspace(start, stop, num)
     elif kind == "geometric0":