Read TDMS - Calculate Average

[Vinc_sp]

Hello,

I acquired data which I stored in a TDMS file and I'd like to make some calculations such as find the mean of my data set.

I successfully read the TDMS file and linked it to a waveform graph, no problem on this part.

However I'm stuck when trying to understand how can I get access to the data other than just to print them on a graph.

How could I sum all the values to find the mean value ?

I'm using LabVIEW 2010.

Thank you.

[Hooovahh · Accepted solution]

Use the Mean.vi function under the probability and statistics.  I'm guessing you are reading a waveform and may need to pull out the Y values using the Get Waveform Components function.  Post some code if you are stuck.

[Vinc_sp]

Well, thanks I made a big step. However the result returned is 0.00.

What am I missing ?

I've attached my code and a pic of the waveform.

[crossrulz · Accepted solution]

---

@Hooovahh wrote:

Use the Mean.vi function under the probability and statistics.  I'm guessing you are reading a waveform and may need to pull out the Y values using the Get Waveform Components function.  Post some code if you are stuck.

---

No need to pull out the Y.  There is a Waveform DC/RMS measurement VI that will do the job. 

[crossrulz]

---

@Vinc_sp wrote:

Well, thanks I made a big step. However the result returned is 0.00.

---

Based on the data, that is perfectly reasonable.  Try changing your display option for the indicator to Exponential or SI notation and you should see more digits of precision.

[Vinc_sp]

Thank to you too !

My 0.00 problem was solved actually I don't really know how. It was a matter of values after the decimal. I just created a new dbl numeric constant which I changed into an indicator.

I attach my code in case someone face the same problem.