If I declared a variable Tp:
 

If I declared a variable Tp:

const fvPatchField<scalar>& Tp =
lookupPatchField<volscalarfield,>("T");

This Tp would represent the values of temperature at inlet. So Tp.size() gives me the number of cells at inlet, Tp.patch().faceCells() gives me the cells list. But if I want just a single temperature value of one cell, how to do that? Thanks!

Sorry I got it. Simply Tp can
 

Sorry I got it. Simply Tp[i] can access to the ith value of the patch!