Get Points from a Line (data set)

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Gabs 2015-10-20

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评论： Gabs 2015-10-20

I have a set of n data pairs (x,y), that are actual measurements. lets say x = [1 2 3 4 5 6 7 10]; and y = [100 200 300 400 500 600 700 800 900 1000];

I need to get estimated values that were not measured.

For example,

how can I find a "y" value within the plotting of that line (a simple plot(x,y) ) when x = 1.75, or x = 4.05 and so on?

Thank you

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Answer 1

arich82 2015-10-20

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编辑：arich82 2015-10-20

在 MATLAB Online 中打开

[Edit to fix grammar and include output.]

It seems interp1 is the answer of the day...

x = [1 2 3 4 5 6 7 8 9 10]; % note: your given x didn't match numel(y)
y = [100 200 300 400 500 600 700 800 900 1000];
xq = [1.75, 4.05];
yq = interp1(x, y, xq)
figure;
plot(x, y, 'r-', xq, yq, 'k+')