System object: dsp.LUFactor
Package: dsp
Decompose matrix into lower and upper triangular matrices
[LU,P] = step(lu,A)
[LU,P,S] = step(lu,A)
Note
Starting in R2016b, instead of using the step method
to perform the operation defined by the System object™, you can
call the object with arguments, as if it were a function. For example, y
= step(obj,x) and y = obj(x) perform
equivalent operations.
[LU,P] = step(lu,A) decomposes
the matrix A into lower and upper
triangular matrices. The output LU
is a composite matrix with lower triangle elements from L and upper triangle elements from U . The permutation vector P is the second output.
[LU,P,S] = step(lu,A) returns
an additional output S indicating
if the input is singular when the ExceptionOutputPort property
is set to true.
Note
obj specifies the System object on
which to run this step method.
The object performs an initialization the first time the step method
is executed. This initialization locks nontunable
properties and input specifications, such as dimensions, complexity,
and data type of the input data. If you change a nontunable property
or an input specification, the System object issues an error.
To change nontunable properties or inputs, you must first call the release method
to unlock the object.