On 10/17/19 11:49 AM, het patel wrote: > > Just one more thing. I have very basic understanding of C++ . In the > code(step-3) it does vector dot product of the gradient without writing any > sort of function to do so. This might sound bit lame to you but, can you tell > me if we can do dot product by simply doing a*b then how to do vector cross > product or matrix multiplication and other such mathematical operations as I > have worked mostly on MATLAB for my assignments where this things are very > easy.
Quantities such as the gradient are represented by the class Tensor<1,dim>, i.e., a rank-1 tensor (=vector) with dim components. All of the usual operations +, -, * are defined for such objects and correspond to their usual mathematical meaning. In particular, gradient*gradient results in a scalar, whereas 2*gradient would result in a vector twice the length as the gradient itself. The same is true if you have matrices of size dim x dim: There is, for example, operator* for such matrices and correspondingly sized vectors. For vector products, you will want to look at the following function and the ones below it: https://www.dealii.org/developer/doxygen/deal.II/classTensor.html#a024cb35dcb0c9c453dfbeaab6bc9f078 Best W. -- ------------------------------------------------------------------------ Wolfgang Bangerth email: [email protected] www: http://www.math.colostate.edu/~bangerth/ -- The deal.II project is located at http://www.dealii.org/ For mailing list/forum options, see https://groups.google.com/d/forum/dealii?hl=en --- You received this message because you are subscribed to the Google Groups "deal.II User Group" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/dealii/0491dcd0-59f4-10fd-579a-01bf38130018%40colostate.edu.
