how to add trend line and output max and min of trend line

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Moshe
Moshe 2016-12-10
Hi all,
I wrote this function:
function [On_Balance_Volume] = OBV(SXXPIndex,PX_VOLUME)
%%OBV Script
On_Balance_Volume = onbalvol(SXXPIndex,PX_VOLUME);
plot(On_Balance_Volume)
title('On-Balance Volume for S&P')
i would like to add to this function trend line and output the minimum and maximum of the function. can someone advise?

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