plot a line that shows the difference between two lines
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hi,
I have the following code:
x=[0:0.0001:20]
y1=blsprice(x,10,0.02,0.2,0.2)-blsprice(10,10,0.02,0.2,0.2)
x1=[8:0.001:12]
y2=[0.85:-0.000425:-0.85]
plot(x,y1,x1,y2,'k')
xlabel('Stock Price ($)');
ylabel('Option price ($)');
axis([8 12 -1 2]);
text(10,1.1,'delta-hedge at t=0')
that gives me one straight line and a curve and I would like to plot a third line with the difference (y1-y2) but it's not working, probably due to the fact that there are different elements, is there any way to do this?
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回答 (2 件)
Walter Roberson
2013 年 4 月 1 日
Use interp1() to produce values with a common x base so that you can subtract meaningfully.
10 件のコメント
Locks
2013 年 4 月 2 日
2 件のコメント
Walter Roberson
2013 年 4 月 2 日
編集済み: Walter Roberson
2013 年 4 月 2 日
As discussed in http://www.mathworks.co.uk/matlabcentral/answers/69325-plot-the-slope-of-a-curve-in-the-same-plot#answer_80575 in order to get the exact slope, you need to work with the formula, not with the calculated data points.
Imagine you are heading due west on a road, and you can see 1 km ahead that the road continues on due west. What is the exact slope?
Oh, did I forget to mention that you are on a mountain-side and that the road you can see ahead is on the next peak over?
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