Thread Subject: Help executing function

I need to write a function that buys a stock at the max and sells at the minimum points. Assume I use all my money to buy a stock and that I could buy fractions of a stock. This is as far as I could get. I was wondering how I would actually go about buying and selling the stock now.

%Lets find the critical points, where we may want to purchase the stock
rowloc=[];
locationsize = 1;
for i = 1:(i)
    if y(i) < y(i+1)
        rowloc(locationsize)=1;
    else
        rowloc(locationsize)=0;
    end
locationsize = locationsize+1;
end
rowloc(locationsize)=0;
%Now that we have found where we may want to buy the stock, lets see where
%we may want to sell the stock
rowloc2=[];
locationsize=1;
for i = 1:(i)
    if y(i) > y(i+1)
        rowloc2(locationsize)=1;
    else
        rowloc2(locationsize)= 0;
    end
locationsize = locationsize+1;
end
rowloc2(locationsize)=0;
%We have found the critical points of the stock, but we need to know what
%the value of the stock is at the critical point.
for x = 1:i+1
newvec(x) = y(x);
end
buystock = newvec.*rowloc;
sellstock = newvec.*rowloc2;
%This creates a matrix of the values.
totals = [buystock ; sellstock]
%Now lets use this information to buy and sell the stock


    
    

On Nov 2, 7:19 pm, "michael DeFelice" <mike198...@yahoo.com> wrote:
> I need to write a function that buys astockat the max and sells at the minimum points.  Assume I use all my money to buy astockand that I could buy fractions of astock.  This is as far as I could get.  I was wondering how I would actually go about buying and selling thestocknow.
>
> %Lets find the critical points, where we may want to purchase thestock
> rowloc=[];
> locationsize = 1;
> for i = 1:(i)
>     if y(i) < y(i+1)
>         rowloc(locationsize)=1;
>     else
>         rowloc(locationsize)=0;
>     end
> locationsize = locationsize+1;
> end
> rowloc(locationsize)=0;
> %Now that we have found where we may want to buy thestock, lets see where
> %we may want to sell thestock
> rowloc2=[];
> locationsize=1;
> for i = 1:(i)
>     if y(i) > y(i+1)
>         rowloc2(locationsize)=1;
>     else
>         rowloc2(locationsize)= 0;
>     end
> locationsize = locationsize+1;
> end
> rowloc2(locationsize)=0;
> %We have found the critical points of thestock, but we need to know what
> %the value of thestockis at the critical point.
> for x = 1:i+1
> newvec(x) = y(x);
> end
> buystock = newvec.*rowloc;
> sellstock = newvec.*rowloc2;
> %This creates a matrix of the values.
> totals = [buystock ; sellstock]
> %Now lets use this information to buy and sell thestock

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