Obtaining the formula for an XY graph

[jh5638]

Hi!

Sorry for the basic question:

Using labview 8.5, developer suite. I have the X and Y inputs for an XY graph (in (sub)array form), I also have the XY graph outputting well. I need to take the gradient of this graph, so I am trying to use NI_Gmath.lvlib:Differentiation.vi however this needs the formula of the graph! I can't for the life of me think how to get this in the form it wants (string)

Any ideas?

Thanks

Jon

[GerdW]

Hi Jon,

the gradient usually is calculated by delta(x)/delta(y), so:
- calc the delta of x- and y-array
- divide both results

This will give you the "gradient" pointwise. You may now calc the mean value, if applicable...

[jh5638]

Ah obvious really, I think I must just have got wrapped up in using the standard vi's and forgetting you can do it simply mathematically!

Thanks

Jon