FunctionParameter Class problem

[Ojos86]

Good afternoon,
I have the following issue when I try to plot a simple difference of moving average.
In the preMain section I convert 3 parameters into numbers using the FunctionParameter Class.
Then I pass those paramethers to 2 ema and 1 coeficient.
But somehow the paramethers for the ema are not detected as NUMBERS. Could you help me to solve this issue?

This is the code:

function preMain() {
setStudyTitle(Diferencia);
setCursorLabelName(Diferencia);
setStudyMax(120);
setStudyMin(-120);
addBand(0, PS_DOT, 1.5, Color.white,0);
setDefaultBarThickness(2,0);
var fp1 = new FunctionParameter("amp", FunctionParameter.NUMBER);
fp1.setDefault(1);
var fp2 = new FunctionParameter("medSup", FunctionParameter.NUMBER);
fp2.setDefault(60);
var fp3 = new FunctionParameter("medInf", FunctionParameter.NUMBER);
fp3.setDefault(30);
}

function main(amp,medInf,medSup) {
var shortAverage = ema(medInf);
var longAverage = ema(medSup);
var diferencia = amp*(shortAverage-longAverage);
return diferencia;
}

This is the error message:

My Formulas\Diferencia.efs, line 37: Error: Failed to call 'ema': parameter # 1 is invalid.
My Formulas\Diferencia.efs, line 23: ReferenceError: Diferencia is not defined

Apparently ema() function does not recognice medInf as a NUMBER but I do not know why, I have declare them in the pre main section like specified in the doc. Extrange issue

Thanks for your help

[ACM]

Ojos86
You have errors in the arguments of the setStudyTitle() and setCursorlabelName() statements which should be strings ie "Diferencia" and not Diferencia
Once you resolve that the script will work fine
FWIW you can accomplish the same result by using the macd() function with the lengths set to 30, 60, 1 respectively or use the Price Oscillator function I posted here and set the parameters to 30, 60, 1
Alex

Good afternoon,
I have the following issue when I try to plot a simple difference of moving average.
In the preMain section I convert 3 parameters into numbers using the FunctionParameter Class.
Then I pass those paramethers to 2 ema and 1 coeficient.
But somehow the paramethers for the ema are not detected as NUMBERS. Could you help me to solve this issue?

This is the code:

function preMain() {
setStudyTitle(Diferencia);
setCursorLabelName(Diferencia);
setStudyMax(120);
setStudyMin(-120);
addBand(0, PS_DOT, 1.5, Color.white,0);
setDefaultBarThickness(2,0);
var fp1 = new FunctionParameter("amp", FunctionParameter.NUMBER);
fp1.setDefault(1);
var fp2 = new FunctionParameter("medSup", FunctionParameter.NUMBER);
fp2.setDefault(60);
var fp3 = new FunctionParameter("medInf", FunctionParameter.NUMBER);
fp3.setDefault(30);
}

function main(amp,medInf,medSup) {
var shortAverage = ema(medInf);
var longAverage = ema(medSup);
var diferencia = amp*(shortAverage-longAverage);
return diferencia;
}

This is the error message:

My Formulas\Diferencia.efs, line 37: Error: Failed to call 'ema': parameter # 1 is invalid.
My Formulas\Diferencia.efs, line 23: ReferenceError: Diferencia is not defined

Apparently ema() function does not recognice medInf as a NUMBER but I do not know why, I have declare them in the pre main section like specified in the doc. Extrange issue

Thanks for your help

[Ojos86]

Thank you :-), everything works OK now

[ACM]

Ojos86
You are welcome
Alex

Thank you :-), everything works OK now