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how to find x value on this graph point name is find??

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Rahul punk
Rahul punk 2019-4-2
评论： Rahul punk 2019-4-15
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Rahul punk
Rahul punk 2019-4-2
i already found all these values
y max
x max
y min
x min
but ,how to find y max previous and next plot point x value??
Rahul punk
Rahul punk 2019-4-15
please help me anyone if u know the answer how to find y max start and ending point in multiple peaks.....

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回答（1 个）

KSSV
KSSV 2019-4-15
Read about min and max. It gives you indices of the respective v alue also.
[val,idx] = max(y) ;
iwant = [x(idx) val] ; % maximum point
iwant1 = [x(idx-1) y(idx-1)] ; % previous point of max
iwant2 = [x(idx+1) y(idx+1)] ; % next point of max

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