MATLAB: I have an array of data from a sensor which varies from positive to negative continuously. I want to find the peak value of each set of positive numbers and negative numbers.

logarithmic decrement calculationsensor data

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Best Answer

>> findpeaks(X(X>0))
ans =
  Columns 1 through 10
    4.5190    4.5260    3.3360    3.1910    2.4630    1.8080    1.7910    1.3260    1.0030    0.7530
  Columns 11 through 20
    0.5650    0.4140    0.3060    0.3030    0.2290    0.2280    0.1710    0.1710    0.1300    0.1180
  Columns 21 through 30
    0.0980    0.0740    0.0520    0.0540    0.0410    0.0410    0.0320    0.0250    0.0190    0.0200
  Columns 31 through 40
    0.0020    0.0150    0.0150    0.0150    0.0110    0.0110    0.0110    0.0110    0.0070    0.0080
  Columns 41 through 50
    0.0090    0.0090    0.0090    0.0020    0.0040    0.0070    0.0020    0.0030    0.0030    0.0040
  Columns 51 through 59
    0.0050    0.0020    0.0020    0.0030    0.0030    0.0030    0.0030    0.0020    0.0020
>> abs(findpeaks(-X(X<0)))
ans =
  Columns 1 through 10
    3.8980    3.7790    2.8760    2.1120    2.1030    1.5570    1.5540    1.1540    0.8550    0.6340
  Columns 11 through 20
    0.4610    0.4700    0.3490    0.2600    0.1950    0.1450    0.1090    0.0790    0.0810    0.0590
  Columns 21 through 30
    0.0600    0.0600    0.0450    0.0450    0.0340    0.0270    0.0270    0.0200    0.0150    0.0150
  Columns 31 through 40
    0.0150    0.0100    0.0030    0.0100    0.0100    0.0100    0.0020    0.0060    0.0060    0.0060
  Columns 41 through 50
    0.0060    0.0050    0.0040    0.0020    0.0040    0.0040    0.0040    0.0040    0.0020    0.0020
  Columns 51 through 60
    0.0020    0.0020    0.0030    0.0030    0.0020    0.0020    0.0020    0.0020    0.0020    0.0020
  Columns 61 through 64
    0.0020    0.0020    0.0020    0.0020
>>
findpeaks is in Signal Processing Toolbox...
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