logrithmic weigthed mean

[ZARAk]

Hi,

how i can create a subroutine to calculate logrithmic weigthed mean pressure and diameter i know the the subroutine for simple mean but not for this :

Mathemitical formula is:

logdg=Σ ni( logdi)/N

Also need to calculate Weigthed geometric mean  and standard deviation 😞

Can anyone please help?

[Zwired1]

The basic idea is to use a FOR loop to step through all of the values (of diameter, for example) and do the inside-the-summation calculation for each.  Sum the array of outputs and divide by the total number, per your formula.

[RavensFan]

Are you in the same class as sheeham?

http://forums.ni.com/t5/LabVIEW/weighted-mean/m-p/303884

[ZARAk]

is it possible to send me a image or the in the file form so i can run in labview please ?

[Zwired1]

It is more appropriate for you to supply what you have tried and ask a question than it is for us to supply an answer to your homework problem.  What have you got so far and what problems are you having with the code?

[ZARAk]

hi,

I tried to create a Vi for mean and standard deviation but i wnat for weigthed mean and weighted standard deviation please suggest wat next i should do?

[RavensFan]

You actually didn't create a VI for mean or std. deviation.  You just used the built-in LabVIEW subVI.

That's okay.  You can open up that subVI and see how they calculated it using basic LabVIEW primitives and compare it to the equations.  Then you can figure out how to modify it to work with whatever mathematical equations you have found for a logarithmic weighted version.