# Dolfinx equivalent of DirichletBC.apply(Function(v).vector()) method in Dolfin

**URL:** <https://fenicsproject.discourse.group/t/dolfinx-equivalent-of-dirichletbc-apply-function-v-vector-method-in-dolfin/10543>\
**Category:** General\
**Created:** [February 27, 2023, 5:37pm UTC](https://fenicsproject.discourse.group/t/dolfinx-equivalent-of-dirichletbc-apply-function-v-vector-method-in-dolfin/10543 "2023-02-27T17:37:44Z")\
**Posts on this page:** 1\
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**Author:** ![dokken](https://yyz2.discourse-cdn.com/free1/user_avatar/fenicsproject.discourse.group/dokken/32/1560_2.png) [@dokken](https://fenicsproject.discourse.group/u/dokken)\
**Post date:** [February 27, 2023, 6:37pm UTC](https://fenicsproject.discourse.group/t/dolfinx-equivalent-of-dirichletbc-apply-function-v-vector-method-in-dolfin/10543/2 "2023-02-27T18:37:56Z")

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See: [Boundary conditions about Mixed space - #2 by dokken](https://fenicsproject.discourse.group/t/boundary-conditions-about-mixed-space/10538/2)  
i.e. you can use `dolfinx.fem.petsc.set_bc`

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