step 21 runs error

[Nick Wang]

When using the function "project", we found the mapping is necessary(in vector_tools_project.templates.h),but in step21(line 1155) don't have mapping. So when we run this exe, it has error and we can't get results. Therefore, we want know how to change this problem.

Thanks,

Nick

[Daniel Arndt]

Nick,

Just pass "MappingQGeneric<dim>(1)" as first argument, see https://www.dealii.org/current/doxygen/deal.II/namespaceVectorTools.html#ac6b404bf03cb2a742b290421cc2789fe.

Best,

Daniel

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