Line trend color in Pine Script

Question

I have the code plotting McGinley Dynamic. My goal is to diffrentiate the colors of the line depending on rising or falling line (green/red).

Code for plotting McGinley works. The problem is that it plots only in one color. After adding last two commented lines (and removing "plot(mg, color=orange, linewidth=4)") which are supposed to change colors the whole code breaks. What is wrong here?

study(title="McGinley Dynamic Average", shorttitle="McGinley", overlay=true, precision=6) len = input(14, minval=1) src = input(close, title="Source") mg = na(mg[1]) ? src : mg[1] + (src - mg[1]) / (0.6 * len * pow(src/mg[1], 4)) plot(mg, color=orange, linewidth=4) //mgc=(mg>mg[1]) ? green:(mg<mg[1]) ? red:(mg==mg[1]):blue:black //plot(mg, color=std?mgc:black, linewidth=3, title="mg")

Expecting McGinley plotted in diffrent colors.

vitruvius · Accepted Answer · 2019-05-02 11:50:50Z

There is a mismatch in your conditions at this line (You placed : instead of ? after (mg == mg[1])):

mgc=(mg>mg[1]) ? green:(mg<mg[1]) ? red:(mg==mg[1]):blue:black

Simply change it to:

mgc = (mg > mg[1]) ? green : (mg < mg[1]) ? red : (mg == mg[1]) ? blue : black

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