Construct projections between FE spaces.
Create scalar mass matrix corresponding to the given field.
Returns: | mtx : csr_matrix
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Project scalar data given by a material-like eval_data() function to a scalar target field variable using the H^1 dot product.
Project a scalar source field variable to a scalar target field variable using the L^2 dot product.
Project scalar data to a scalar target field variable using the L^2 dot product.
Parameters: | target : FieldVariable instance
eval_data : callable or array
order : int, optional
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