get X axes values by indexing

[olivier66]

Hi
I would like to know why in the folowing example I have my X axe graph's values are the  loop  iteration index(1st column)  instead of  the values of the 2nd column(time)
I want my graph with Y value according to time(2nd column values)
I thougt I was supposed to do it like that but it's not working as I want
could somebody explain me why?

I join my VI and the txt file

thank you
Olivier

[GuenterMueller]

Hello Olivier,

you are using waveform data in your VI. Waveform data requires that you have sampled your data at a constant rate and wire this information to dt.  Your x.txt contains distinct time values when acquisitions were done and the dt is not a constant. So your data is a good candidate for an XY Graph. This one supports an array of (x,y) coordinates. You can also wire more than one graph to an XY Graph.

Best regards, Guenter

[olivier66]

Hello gueter
Thanks very much for your speedy reply ---your  answer is the fastest I have ever received. perhaps because I usually use french community forum.and thank you so much your answer is also exactly what I needed to know.

Olivier