Overlays - Technical Analysis Toolbox™

Overlays

Several overlay functions are detailed below. Overlays are usually plotted over price data. These overlay functions allow you the freedom to examine the data as you wish.

Contents

Functions

Function List
Global Syntax

Examples

Bollinger Bands
Fibonacci Retracement Lines
Keltner Channels
Moving Averages
Price Channels
Typical Price

Functions

Function List

Function	Description
bollingerbands	Bollinger Bands
fiblines	Fibonacci Retracement Lines
keltnerchannels	Keltner Channels
mavg	Moving Averages
pricechannel	Price Channels
typrice	Typical Price

Global Syntax

All indicator and overlay functions have the same core syntax. This syntax is described in detail in the indicators help section here.

See: Global Syntax

Examples

Bollinger Bands

Syntax
MyStocks.bollingerbands(smaperiod,nstd); bollingerbands(MyStocks,smaperiod,nstd); bollingerbands(MyStocks(iStock),smaperiod,nstd); bollingerbands(Close,smaperiod,nstd);
Optional Arguments	Default
smaperiod	20
nstd	2.0
Output Notes
The output of the bollingerbands function contains a 3 column array is as follows: stockasset input: bbands1 = MyStocks.bollingerbands(...); bbands1 = bollingerbands(MyStocks,...); bbands1{iStock} = [simplemovavg upperband lowerband] numeric array input: bbands2 = bollingerbands(MyStocks(iStock),...); bbands2 = bollingerbands([High Low Close],...); bbands2 = [simplemovavg upperband lowerband]

Example

smaperiod = 20;
nstd = 2;
bbands1 = MyStocks.bollingerbands(smaperiod,nstd);
coptions = chartoptions('candle', 3months');
figure(1)
clf
hgroup = stockchart(MyStocks(iStock),coptions);
addoverlay(hgroup,bbands1{iStock}, 'BBands(20,2)')
xlabel(hgroup(end), 'Date')
title('Bollinger Bands','fontweight','bold')

Fibonacci Retracement Lines

Syntax
fline1 = MyStocks.fiblines(period); fline2 = fiblines(MyStocks,period); fline3 = fiblines(MyStocks(iStock),period); fline4 = fiblines([High Low],period);
Optional Arguments	Default
period	20
Output Notes
The fiblines function returns a 5 column array corresponding to the levels: [0% 38.2% 50% 61.8% 100%]. These levels indicate the percent level between the lowest low and the highest high over the period. The 5 column array output of the fiblines function is as follows: stockasset input: bbands1 = MyStocks.bollingerbands(...); bbands1 = bollingerbands(MyStocks,...); bbands1{iStock} = [simplemovavg upperband lowerband] numeric array input: bbands2 = bollingerbands(MyStocks(iStock),...); bbands2 = bollingerbands([High Low],...); bbands2 = [simplemovavg upperband lowerband]

Example

period = 20;
fline1 = MyStocks.fiblines(period);

coptions = chartoptions('candle', 3months');
figure(1)
clf
hgroup = stockchart(MyStocks(iStock),coptions);
addoverlay(hgroup,fline1{iStock}, 'Fibonccai(20)')
xlabel(hgroup(end), 'Date')
title('Fibonacci Retracement','fontweight','bold')

Keltner Channels

Syntax
MyStocks.keltnerchannels(emaperiod,natr,atrperiod); keltnerchannels(MyStocks,emaperiod,natr,atrperiod); keltnerchannels(MyStocks(iStock),emaperiod,natr,atrperiod); keltnerchannels([High Low Close],emaperiod,natr,atrperiod);
Optional Arguments	Default
emaperiod	20
natr	2.0
atrperiod	10
Output Notes
The output of the keltnerchannels function contains a 3 column array as follows: stockasset input: kchan1 = MyStocks.keltnerchannels(...); kchan1 = keltnerchannels(MyStocks,...); kchan1{iStock} = [expmovavg upperband lowerband] numeric array input: kchan2 = keltnerchannels(MyStocks(iStock),...); kchan2 = keltnerchannels([High Low Close],...); kchan2 = [expmovavg upperband lowerband]

Example

emaperiod = 20;
natr = 2.0;
atrperiod = 10;
kchan1 = MyStocks.keltnerchannels(emaperiod,natr,atrperiod);

coptions = chartoptions('candle', '3months');
figure(1)
clf
hgroup = stockchart(MyStocks(iStock),coptions);
addoverlay(hgroup,kchan1{iStock}, 'KChannels(20,2.0,10)')
xlabel(hgroup(end), 'Date')
title('Keltner Channels','fontweight','bold')

Moving Averages

Syntax
MyStocks.mavg(period, matype); mavg(MyStocks,period, matype); mavg(MyStocks(iStock),period, matype); mavg(Close,period, matype); mavg([Close Volume],period, [matype = 'vwma']);
Optional Arguments	Default
period	20
matype	'ema'
Syntax Notes
The following moving average types are supported: 'sma': simple moving average 'ema': exponential moving average 'wma': weighted moving average 'vwma': volume weighted moving average

Example

period = 20;
ma1 = MyStocks.mavg(period, 'ema');

coptions = chartoptions('candle', 3months');
figure(1)
clf
hgroup = stockchart(MyStocks(iStock),coptions);
ha = addoverlay(hgroup,MyStocks(iStock).mavg(5,'ema'),'ema(5)');
set(ha,'color',[0 0 1])
ha = addoverlay(hgroup,MyStocks(iStock).mavg(20,'ema'),'ema(20)');
set(ha,'color',[1 0 0])
xlabel(hgroup(end), 'Date')
title('Exponential Moving Average', 'fontweight', 'bold')

Price Channels

Syntax
MyStocks.pricechannel(period); MyStocks(iStock).pricechannel(period); pricechannel(MyStocks(iStock),period); pricechannel([High Low],period);
Optional Arguments	Default
period	20
Output Notes
The output of the pricechannel function contains a 2 column array as follows: stockasset input: prchannel1 = MyStocks.pricechannel(...); prchannel1 = pricechannel(MyStocks,...); prchannel1{iStock} = [upperchannel lowerchannel] numeric array input: prchannel2 = pricechannel(MyStocks(iStock),...); prchannel2 = pricechannel([High Low],...); prchannel2 = [upperchannel lowerchannel]

Example

period = 20;
prchannel1 = MyStocks.pricechannel(period);

coptions = chartoptions('candle', 3months');
figure(1)
clf
hgroup = stockchart(MyStocks(iStock),coptions);
addoverlay(hgroup,prchannel1{iStock}, 'PriceChannels(20)')
xlabel(hgroup(end), 'Date')
title('Price Channels', 'fontweight', 'bold')

Typical Price

Syntax
MyStocks.typrice; typrice(MyStocks); typrice(MyStocks(iStock)); typrice([High Low Close]);
Optional Arguments	Default
none	NA

Example

typ1 = MyStocks.typrice;

coptions = chartoptions('candle', 3months');
figure(1)
clf
hgroup = stockchart(MyStocks(iStock),coptions);
addoverlay(hgroup,typ1{iStock}, 'TypPrice')
xlabel(hgroup(end), 'Date')
title('Typical Price', 'fontweight', 'bold')