PublicFunctions/Get-FMPDoubleExponentialMovingAverage.ps1
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function Get-FMPDoubleExponentialMovingAverage { <# .SYNOPSIS Retrieves Double Exponential Moving Average (DEMA) technical indicator data for a specified symbol. .DESCRIPTION The Get-FMPDoubleExponentialMovingAverage function calculates and returns the Double Exponential Moving Average (DEMA) technical indicator for a given symbol. DEMA reduces the lag of traditional EMAs by applying a double smoothing process. .PARAMETER Symbol Specifies the stock symbol (e.g., AAPL, MSFT) for which to retrieve the DEMA. This parameter is mandatory. .PARAMETER PeriodLength Specifies the number of periods to consider for calculating the DEMA. This parameter is mandatory. .PARAMETER Timeframe Specifies the timeframe to use for calculations. Valid values include: 1min, 5min, 15min, 30min, 1hour, 4hour, 1day, 1week, 1month. The default value is "1day". .PARAMETER ApiKey Specifies your Financial Modeling Prep API key. If omitted, the function attempts to retrieve it using Get-FMPCredential. .EXAMPLE Get-FMPDoubleExponentialMovingAverage -Symbol AAPL -PeriodLength 20 -Timeframe 1day .NOTES This is a premium endpoint, and requires a paid subscription. This function uses the Financial Modeling Prep API's DEMA endpoint. For more information, visit: https://site.financialmodelingprep.com/developer/docs/stable/double-exponential-moving-average #> [CmdletBinding()] Param ( [Parameter(Mandatory = $true)] [string] $Symbol, [Parameter(Mandatory = $true)] [int] $PeriodLength, [Parameter(Mandatory = $false)] [ValidateSet("1min", "5min", "15min", "30min", "1hour", "4hour", "1day", "1week", "1month")] [string] $Timeframe = "1day", [Parameter(Mandatory = $false)] [string] $ApiKey = (Get-FMPCredential) ) Begin { if (-not $ApiKey) { $ApiKey = Read-Host "Please enter your Financial Modeling Prep API key" } $baseUrl = "https://financialmodelingprep.com/stable/technical-indicators/dema" } Process { $queryParams = @{ symbol = $Symbol periodLength = $PeriodLength timeframe = $Timeframe apikey = $ApiKey } $queryString = ($queryParams.GetEnumerator() | ForEach-Object { "$($_.Key)=$($_.Value)" }) -join "&" $url = "{0}?{1}" -f $baseUrl, $queryString $headers = @{ "Upgrade-Insecure-Requests" = "1" } try { $response = Invoke-RestMethod -Uri $url -Method Get -Headers $headers -ErrorAction Stop return $response } catch { throw "Error retrieving Double Exponential Moving Average data: $_" } } }; |