Proper video demo of technical analysis trend line via regression in Matlab with source code

I finally achieved this via a simple regression line, why oh why do I complicated things unecessarily ? This is my of internal trading system

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Source code:

*function [ clrev ] = fetchYahoo( sym )*

*%FETCHYAHOO Summary of this function goes here*

*% Detailed explanation goes here*

*c = yahoo;*

*d = fetch(c,sym,’1/1/2010′,’9/29/2014′)*

*close(c)*

*cl=d(:,5); %close*

*clrev=flipud(cl);*

*end*

—-

*function trendline(Y1)*

*%CREATEREND(Y1)*

*% Y1: vector of y data*

*% Auto-generated by MATLAB on 30-Sep-2014 00:06:07*

*% Create figure*

*figure1 = figure;*

*% Create axes*

*axes1 = axes(‘Parent’,figure1);*

*box(axes1,’on’);*

*hold(axes1,’all’);*

*% Create plot*

*plot1 = plot(Y1,’Parent’,axes1,’DisplayName’,’data1′);*

*% Get xdata from plot*

*xdata1 = get(plot1, ‘xdata’);*

*% Get ydata from plot*

*ydata1 = get(plot1, ‘ydata’);*

*% Make sure data are column vectors*

*xdata1 = xdata1(:);*

*ydata1 = ydata1(:);*

*% Remove NaN values and warn*

*nanMask1 = isnan(xdata1(:)) | isnan(ydata1(:));*

*if any(nanMask1)*

* warning(‘GeneratedCode:IgnoringNaNs’, …*

* ‘Data points with NaN coordinates will be ignored.’);*

* xdata1(nanMask1) = [];*

* ydata1(nanMask1) = [];*

*end*

*% Find x values for plotting the fit based on xlim*

*axesLimits1 = xlim(axes1);*

*xplot1 = linspace(axesLimits1(1), axesLimits1(2));*

*fitResults1 = polyfit(xdata1, ydata1, 1);*

*% Evaluate polynomial*

*yplot1 = polyval(fitResults1, xplot1);*

*% Plot the fit*

*fitLine1 = plot(xplot1,yplot1,’DisplayName’,’ linear’,’Parent’,axes1,…*

* ‘Tag’,’linear’,…*

* ‘Color’,[1 0 0]);*

*% Set new line in proper position*

*setLineOrder(axes1, fitLine1, plot1);*

*% Create legend*

*legend(axes1,’show’);*

*%————————————————————————-%*

*function setLineOrder(axesh1, newLine1, associatedLine1)*

*%SETLINEORDER(AXESH1,NEWLINE1,ASSOCIATEDLINE1)*

*% Set line order*

*% AXESH1: axes*

*% NEWLINE1: new line*

*% ASSOCIATEDLINE1: associated line*

*% Get the axes children*

*hChildren = get(axesh1,’Children’);*

*% Remove the new line*

*hChildren(hChildren==newLine1) = [];*

*% Get the index to the associatedLine*

*lineIndex = find(hChildren==associatedLine1);*

*% Reorder lines so the new line appears with associated data*

*hNewChildren = [hChildren(1:lineIndex-1);newLine1;hChildren(lineIndex:end)];*

*% Set the children:*

*set(axesh1,’Children’,hNewChildren);*

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