I want to make my Stochastics indicator look the same as that in ThinkorSwim. Support recommended I review this article.

http://www.tc2000.com/tc2000help/#Indicators/Stochastics.htm#kanchor83

I did, but I'm still having issues.

This is the code I'm using in TOS.  (Note: you can ignore the extra lines being drawn at the bottom, as I already know who to draw them in TC2K).

#

# TD Ameritrade IP Company, Inc. (c) 2008-2014

# STODTP, Modified from StochasticFull, to add horizontal lines at 38, 50, 62

#

declare lower;

input over_bought = 80;

input over_sold = 20;

input KPeriod = 6;

input DPeriod = 5;

input priceH = high;

input priceL = low;

input priceC = close;

input slowing_period = 3;

input averageType = AverageType.SIMPLE;

def lowest_k = Lowest(priceL, KPeriod);

def c1 = priceC - lowest_k;

def c2 = Highest(priceH, KPeriod) - lowest_k;

def FastK = if c2 != 0 then c1 / c2 * 100 else 0;

plot FullK = MovingAverage(averageType, FastK, slowing_period);

plot FullD = MovingAverage(averageType, FullK, DPeriod);

plot OverBought = over_bought;

plot OverSold = over_sold;

FullK.SetDefaultColor(GetColor(6));

FullD.SetDefaultColor(GetColor(5));

OverBought.SetDefaultColor(GetColor(6));

OverSold.SetDefaultColor(GetColor(6));

 plot line38 = 38;

line38.setDefaultColor(getColor(5));

 plot line62 = 62;

line62.setDefaultColor(getColor(5));

plot line50 = 50;

line50.setDefaultColor(getColor(08));

In TC2K, I've set %K = 6; %D = 5; Period = 3; Average Type = Simple. 

TC2K is close, but still not an exact match for TSO.  What other changes should I make?  Thanks for your help! 

Set the period to 6, %K to 3, and %D to 5 and see if that matches. That is a "slow" stochastic.

If I am understanding the code correctly (which is not guaranteed), you want the Period set to 6, the %K set to 3 and the Average Type set to Simple in the Stochastics indicator itself. And you would want Period set to 5 and Average Type set to Simple in the %D indicator.

Thank you, Gentlemen.  That looks like it's a match for TOS.  Genius!

You're welcome.