how can i get extra data on graph

2015 5 2
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更新时间：2015 5 2
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How can I extra data from plot graph? As i have data x axis= 10,12,14,16,18 and their corresponding value on y axis= 0.6,0.9,1,0.2,1.28. Now how can I get y axis value for x axis value 20?

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Azzi Abdelmalek
Azzi Abdelmalek 2015-5-2

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You can use interp1 function
x=[10,12,14,16,18]
y=[0.6,0.9,1,0.2,1.28]
xi=20
yi=interp1(x,y,xi,'linear','extrap')

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