Minor fix to concatenate
@@ -237,6 +237,7 @@ def sd_array(img, walks=100, st_frac=0.2, stride=100, maxsteps=3000,
if previous_sds is not None:
sd_prev, sd_free_prev = previous_sds
sd = np.concatenate((sd_prev, sd))
+ sd_free = np.concatenate((sd_free_prev, sd_free))
return (sd, sd_free)
