This page presents Gram-Schmidt orthogonalization as a geometric process rather than as a list of formulas. The images below show how the columns are gradually corrected and normalized in 2D and 3D, making the construction of an orthonormal basis visible step by step.
One useful way to view Gram-Schmidt is as a sequence of right-side updates that change one active column at a time. In this interpretation, scale and shear are removed step by step from the original matrix, producing the orthonormal matrix Q, while the removed transformations accumulate into the upper-triangular factor R.
In two dimensions, the first column is normalized, then the second is orthogonalized against it and normalized. The static diagram shows the sequence as a chain of intermediate matrices, while the animation shows the same process unfolding continuously.
The geometric changes correspond to the symbolic updates that normalize the first column and then remove the component of the second column in that direction. This makes the construction of the orthonormal basis visible as a continuous motion.
In three dimensions, the same logic continues one column at a time. After the first normalization, the second column is made orthogonal to the first, then normalized, and finally the third is corrected against the first two and normalized.
Each new direction is corrected against the previously established orthogonal directions, making the construction of the orthonormal basis visible step by step. This is the process viewpoint behind the factorization.
Related visual: QR Decomposition — Geometric Interpretation in 2D and 3D
Related chapter: QRF, Gram-Schmidt, part 2
Related work: GraphMath Linear Algebra
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