If you look into the documentation for "pdepe", you will find that the "Vectorized" option cannot be chosen:
Cited from the documentation of "pdepe":
options — Option structure
structure array
Option structure, specified as a structure array. Use the odeset function to create or modify the option structure. pdepe supports these options:
In most cases, default values for these options provide satisfactory solutions.
If I remember correctly, this variant of "pdepe" has the choice to vectorize the calls to the function where you provide c, s and f:
