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How to find x data in a interpolate curve?

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Artur M. G. Lourenço
Hello everybody,
how can I find the data of x related to y on a curve interpolated data for x and y?
wanted to find the time for example regarding the flow accumulated 2867.04.
function
https://docs.google.com/file/d/0B9JmyPHF_ZMPMmtGV3hNMnpkUjg/edit?usp=sharing
date
https://docs.google.com/file/d/0B9JmyPHF_ZMPTzdlUHlibjFzRzg/edit?usp=sharing

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采纳的回答

Andrei Bobrov
Andrei Bobrov 2013-5-31
f2 = @(y)fzero(@(x)fitresult(x)-y,0);
out = f2(2867.04);

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