plotting coordinates and fitting

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Ede gerlderlands
Ede gerlderlands 2012-11-5
I have 3 coordinates which are (12,0.6},(50,0.8) and (145,0.4) and i have x values that range from 1 to 500 and I want to fit y values linearly for each of x's (1:500) based on the three y values I have. Any help in this regard is highly appreciated.

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Matt J
Matt J 2012-11-5
编辑：Matt J 2012-11-5
p=polyfit([12 50 145],[.6 .8 .4],1);
y=polyval(p,1:500);

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