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how to find nearest value to zeros?

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prianka shukla
prianka shukla 2016-3-23
回答： dpb 2016-3-23
i want to write a code to find a time between two values which are nearest one to zeros because i dont have any zeros in my signal.and I dont have any function I have just y values and time values.and between that time wich value of y is exist.thanks

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dpb
dpb 2016-3-23
If the signal crosses zero, look at
doc fzero
Otherwise, if is all positive the point nearest zero is simply
[ymin,ixmin]=min(y);
Obviously if y<0, min is max or use abs(y). Also, if is monotonic,
doc interp1 % to find intersection closer than nearest computed value
Failing that, there's
doc fminbnd
doc fminsearch

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