filt

filt(b, a, x, [si])

Apply filter described by vectors a and b to vector x, with an optional initial filter state vector si (defaults to zeros).

Examples

  1. Filter a vector using coefficients a and b:

    julia> a = [1, -0.5];
    julia> b = [0.25, 0.5];
    julia> x = [1, 2, 3, 4, 5];
    julia> filt(b, a, x)
    5-element Array{Float64,1}:
    0.25
    1.0
    1.625
    2.375
    3.1875

    This example applies the filter described by the coefficient vectors a and b to the input vector x.

  2. Apply filter with an initial state vector:
    julia> a = [1, -0.5];
    julia> b = [0.25, 0.5];
    julia> x = [1, 2, 3, 4, 5];
    julia> si = [0.5, 0.75];
    julia> filt(b, a, x, si)
    5-element Array{Float64,1}:
    0.375
    1.4375
    1.96875
    2.984375
    3.9921875

    In this example, an initial filter state vector si is provided, which affects the output of the filter.

Common mistake example:

julia> a = [1, -0.5];
julia> b = [0.25, 0.5];
julia> x = [1, 2, 3, 4, 5];
julia> filt(b, a, x, [0.1, 0.2, 0.3])
ERROR: DimensionMismatch("Cannot multiply two vectors")

In this example, the initial state vector si has a different length than the coefficient vectors a and b. It's important to ensure that the dimensions of the coefficient vectors and the initial state vector match for the filter operation to be valid.

See Also

User Contributed Notes

Add a Note

The format of note supported is markdown, use triple backtick to start and end a code block.

*Required Field
Details

Checking you are not a robot: