find the max and mark on the curve!

Programming Questions

455317619

find the max and mark on the curve!

in Programming Questions • 21 days ago

HI.! I wanna mark the maximum when the maximum comes! but the result shows that there are lots of maximum out of marking ! why ?

the following is my code!

for(count=1;count<RawX.length-2;count++)

{

if((ScaledX[RawX.length-2-count]-ScaledX[RawX.length-3-count])>0)

if((ScaledX[RawX.length-2-count]-ScaledX[RawX.length-1-count])>0)

{

ellipse(RawX.length-2-count,ScaledX[RawX.length-2-count]+100,8,8);

}

adn the result is

THX!!

Replies(2)

PhiLho

Re: find the max and mark on the curve!

21 days ago

First hit of a quick Google search (find peak on curve):
http://terpconnect.umd.edu/~toh/spectrum/PeakFindingandMeasurement.htm

At a glance on the code, it confirms it is not a trivial task, if you want to avoid wrong results. Comparing two values is not enough, you have to compute the slope of the curve, see where it change the sign, etc.

455317619

Re: find the max and mark on the curve!

21 days ago

THANK YOU PhiLho.

actually, I draw a sine wave.

and comparing the two values , finally I can mark at the peaks.

why I can not ellipse in my accelerator signal peaks?

thx for your answer!

Top Reply