corrected bug related to testing of OJ_GU_seg

Author: oscarjalnefjord

src/original/OJ_GU/ivim_seg.py

@@ -207,5 +207,11 @@ def _Ddiff(Y, yb, b, D):
 
     f = _f_from_intercept(A, S0)
 
+    if Y.shape[0] == 1:
+        D = np.array(D)
+        f = np.array(f)
+        Dstar = np.array(Dstar)
+        S0 = np.array(S0)
+
     pars = {'D': D, 'f': f, 'Dstar': Dstar, 'S0': S0}
     return pars