datahead8888 0 Posted November 30, 2013 Share Posted November 30, 2013 Hello,Background:I was going to implement an implicit approach to 3d tetrahedra deformations (first in Matlab then in C++).I need the Jacobian for the partial derivative of force wrt position to do this.I found this paper that gives a method for computing it:http://www-bcf.usc.edu/~jbarbic/Barb...nessMatrix.pdfThe Question:In the report, he defines a 2skew function (to the right of the page). I'm pretty confused on what it means. I think I forgot what skew means from linear algebra - that's probably part of my problem. It sounds like skew symmetric means that a negated matrix is equal to its transpose. What exactly is this 2skew function for? Link to post Share on other sites

ajb 1567 Posted December 1, 2013 Share Posted December 1, 2013 You have the notion of skewness and skew functions in statistics, but this is I think not what you are asking about. I assume the author is talking about bilinear forms and/or matrices being skew symmetric. It means that under the interchange of some indices we have A_{ij} =-A_{ji}. For a bilinear form we have B(u,v) = - B(v,u). Link to post Share on other sites

## Recommended Posts

## Create an account or sign in to comment

You need to be a member in order to leave a comment

## Create an account

Sign up for a new account in our community. It's easy!

Register a new account## Sign in

Already have an account? Sign in here.

Sign In Now