projection matrix

Noun

projection matrix (plural projection matrices)

1. A transformation matrix whose associated transformation is a projection.
   • The resultant eigenvalues of the angular momentum are independent of direction, but the projection matrices are dependent.2006, H. Watari, Y. Shimoyama, Chapter 5: Density Matrix Formalism of Angular Momentum in Multi-Quantum Magnetic Resonance, Christopher J. Bender, Lawrence Berliner (editors, Computational and...
   • We use the GLU utility function gluPerspective() to set the projection matrix and define the whole image to be the view port (essentially what is to be shown).2012, Jan Erik Solem, Programming Computer Vision with Python, O'Reilly, page 91
2. A matrix that maps a vector of response (dependent variable) values to a vector of fitted or predicted values.
   • Caswell (1989) pointed out that most linear stage-structured models have both primitive and irreducible projection matrices.[…]The projection matrix M shown in the table is then calculated as PS + R.1999, Terrance J. Quinn II, Richard B. Deriso, Quantitative Fish Dynamics, Oxford University Press, page 372
   • We then turn to applications of population projection matrices both for natural resource management and for conservation.2013, John H. Vandermeer, Deborah E. Goldberg, Population Ecology: First Principles, 2nd edition, Princeton University Press, page 62