CODEWITHSUNDEEP
global-variablespine-script
lodha2006
lodha2006

Reputation: 11

Conversion to pinescript v4

I am trying to convert the following function into pinescript v4.0:

ssFilter( price, lowerBand ) =>
    angle = sqrt(2)*PI/lowerBand
    a1= exp(-angle)
    b1 = 2*a1*cos(angle)
    c2 = b1
    c3 = -a1*a1
    c1 = 1 - c2 -c3
    filt := c1*(price + nz(price[1]))/2 + c2*nz(filt[1]) + c3*nz(filt[2])

But, it returns with an error:

Cannot modify global variable 'filt' in function

Upvotes: 1

Views: 189

Answers (1)

Bjorn Mistiaen
Bjorn Mistiaen

Reputation: 6915

Your function should be like this

ssFilter(price, lowerBand) =>
    angle = sqrt(2)*PI/lowerBand
    a1= exp(-angle)
    b1 = 2*a1*cos(angle)
    c2 = b1
    c3 = -a1*a1
    c1 = 1 - c2 -c3
    c1*(price + nz(price[1]))/2 + c2*nz(filt[1]) + c3*nz(filt[2])

and then in your main code, you should use your function to assign the result to filt, like this:

filt := ssFilter(price, lowerBand)

Upvotes: 1

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