fxcodebase-backup

Momentum

Source: https://fxcodebase.com/code/viewtopic.php?f=17&t=896
Forum: 17 · Topic 896 · 8 post(s)

Momentum

Alexander.Gettinger · Fri Apr 30, 2010 11:26 am

The Momentum Technical Indicator measures the amount that a security’s price has changed over a given time span.

Calculation: Momentum is calculated as a ratio of today’s price to the price several (N) periods ago.

MOMENTUM = CLOSE(i)/CLOSE(i-N)*100

Where: CLOSE(i) — is the closing price of the current bar; CLOSE(i-N) — is the closing bar price N periods ago.

function Init()
    indicator:name("Momentum");
    indicator:description("Momentum");
    indicator:requiredSource(core.Tick);
    indicator:type(core.Oscillator);
   
    indicator.parameters:addInteger("N", "N", "Period", 14);

    indicator.parameters:addColor("clrMom", "Color of momentum", "Color of momentum", core.rgb(0, 255, 0));
end

local first;
local source = nil;
local N;

function Prepare()
    source = instance.source;
    N=instance.parameters.N;
    first = source:first();
    local name = profile:id() .. "(" .. source:name() .. ", " .. N .. ")";
    instance:name(name);
    Momentum = instance:addStream("Momentum", core.Line, name .. ".Momentum", "Momentum", instance.parameters.clrMom, first);
end

function Update(period, mode)
    if (period>first+N) then
     Momentum[period]=source[period]*100./source[period-N];
    end
end