Extract lower or upper triangle from input matrices
Math Functions / Matrices and Linear Algebra / Matrix Operations
The Extract Triangular Matrix block creates a triangular matrix output from the upper or lower triangular elements of an M-by-N input matrix. The block treats length-M unoriented vector inputs as an M-by-1 matrix.
The Extract parameter selects between the two components of the input:
Upper — Copies the
elements on and above the main diagonal of the input matrix to an
output matrix of the same size. The first row of
the output matrix is therefore identical to the first row of
the input matrix. The elements below the main diagonal of the output
matrix are zero.
Lower — Copies the
elements on and below the main diagonal of the input matrix to an
output matrix of the same size. The first column of
the output matrix is therefore identical to the first column of
the input matrix. The elements above the main diagonal of the output
matrix are zero.
The ex_extracttriang_ref model below shows the extraction of upper and lower triangles from a 5-by-3 input matrix.
The component of the matrix to copy to the output: upper triangle or lower triangle.
Code generation (default) — Simulate
model using generated C code. The first time you run a simulation,
Simulink® generates C code for the block. The C code is reused for
subsequent simulations, as long as the model does not change. This option
requires additional startup time but provides faster simulation speed than
Interpreted execution — Simulate model
using the MATLAB® interpreter. This option shortens startup time but has slower
simulation speed than
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