POWER and ENTROPY in Lab VIEW

[Gurminder]

Same question once again......1).How to find out "APPROXIMATE ENTROPY" of the time series signal.??????

     2) How to find out "Power in peak Frequency" of the frequency domain signal??????
 I actually acquired a acceleration signal., then i transform it in frequency domain using spectral analysis express VI and find out peak frequency (using statsics express VI) , now i want to calculate power in peak frequency and approximate entropy of the time series signal.......but not getting any express VI for it in Lab VIEW2010.  I m attatching my VI program in which i need to find power in peak frequency and approximate entropy.........plzz plzz reply soon

[altenbach]

Overuse of question marks with the absense of useful information does not help.

LabVIEW might not have have all the functions you need, but it is a full featured programming language, so you can make your own. You can find the theory in wikipedia and elsewhere. Why does it have to be an express VI?

(There is also the advanced singal processing toolkit that seem ho have some extra functions, but I haven't really used it)

I also don't quite undestand your diagram. Why is there a while loop that repeats the same calculation (same input, same result) over and over, as fast as the computer allows, constantly re-reading the same file? Once is enough!

[Nabeloabbasi]

hi

if there is no direct function then you can define the formula and make the function

\like if you looking for entrophy then you can define formula and make subvi of it

tc

[Nabeloabbasi]

hi

if there is no direct function then you can define the formula and make the function

\like if you looking for entrophy then you can define formula and make subvi of it

tc

[Ben]

I have no idea if the following will help out but I'll post in the hope that it may.

A Chart with multiple plots that use the Waveform data type has a hsitory that returns a 2D arrray of WFs. Each WF contanins an array of values associated with that plot.

To turn the 2D array of WF into a 1D array of WF the history data must be must be iterated through and all subsequent WFs pulled from teh WF and added to the initial WF for that plot.

Let the first WF establish the start time (t0) and dt and just add the data for the subsequent WF to that data in the first.

When done you should have a 1D array where each element in the array can be passed to those sub-VI expecting a WF data type.

Not holding out much hope that this post will help,

Ben

[Gurminder]

Rrspected Sir

1).1stly extreemly sorry for overusing of question marks.U r right "Overuse of question marks with the absense of useful information does not help."

2)Secondly sir i used while loop bcz if i dont use it then "READ From Meas. File Express VI" reads only 1st value from the lvm file, and VIthat  i attatched will not

run over and over bcz sir i attatched STOP to the end of file option., so this VI reads the lvm file untill it finish reading lvm file(untill reads the last value).

3) I saw "TSA entropy VI " for entropy measurement when i go through internet search but in Lab VIEW2010 there is no VI present.