Computing FIR Filters Using Arrays [WMA Example]

// This source code is subject to the terms of the Mozilla Public License 2.0 at https://mozilla.org/MPL/2.0/
// REUSING THIS CODE: You are welcome to reuse this code without permission. Credits are appreciated.
//@author=alexgrover,️ for PineCoders

// Computing FIR Filters Using Arrays [WMA Example]
// This script provides a template for calculating FIR filters using arrays.
// The calculation of the coefficients should be executed in line 18 (variable `w`).

// PineCoders, Tools and ideas for all Pine coders: pinecoders.com
// ------------------------------------------------------------------------------------------------
// Original author:  PineCoders
// Original title:   Computing FIR Filters Using Arrays [WMA Example]
// Licence:          MPL-2.0 (the header above is the original notice, kept verbatim)
// Pine version:     4
// Fetched:          2026-10-12
// Ported to FloScript by FloSignals; modifications under MPL-2.0.
// Converter:        @flosignals/floscript 0.1.0, strict mode, score 100/100
// ------------------------------------------------------------------------------------------------
//@floscript=1
//@version=5
// Converted by the FloScript converter from a Pine-compatible v4 source.

indicator("Computing FIR Filters Using Arrays [WMA Example]", overlay=true)
length = input(14)
src = input(close)
//----
var b = array.new_float(0)
if barstate.isfirst
    for i = 0 to length - 1
        w = length - i
        array.push(b, w)
den = array.sum(b)
//----
sum = 0.
for i = 0 to length - 1
    sum := sum + src[i] * array.get(b, i)
filt = sum / den
//----
plot(filt, "Plot", #2157f3, 2)

This file is under the Mozilla Public License 2.0; it is a port of the original by PineCoders, with the original licence header kept and the changes made for FloScript noted in the file.

• v22026-10-14

  Library refresh 2026-10-14

• v12026-10-12

  Library refresh 2026-10-12