diff --git a/aptimer_cal/calculation/distime.py b/aptimer_cal/calculation/distime.py
index b3c5388..0b58a90 100644
--- a/aptimer_cal/calculation/distime.py
+++ b/aptimer_cal/calculation/distime.py
@@ -341,6 +341,7 @@ def show_input(self):
                 # SPACE LOOP ENDS
 
                 # computing the matrix
+                R = R.flatten()
                 phin[:, gg] = list(np.matmul(np.linalg.inv(L), R))
 
                 # calculating the concentration of the dependent component