Integrate without Express VIs

[ap8888]

I need to integrate a data array (2-D array double), but I don't have native integral VIs that come with the full development system. Nor do I wish to use the express VI.

Is the attached an effective way to integrate X-Y data? Any ideas for improvements?

Thanks

[MoReese]

If you downconvert your VI to LV10 or below, I will take a look (Files>>Save for Previous Version).

[JÞB]

Wait...I see something a bit fishy.  If Input is a step function that works but if we apply the trapizoidal rule you would want to add the lower value of X(n) and X(n-1) times delta Y + 1/2 Delta X * Y

[ap8888]

Woops this look better?

Any ideas for improvements?

[JÞB]

not quite.

attach the vi and we may help tweek it to implement the function I discribed earlier

[ap8888]

Here you go!

Thanks

[JÞB · Accepted solution]

Wasn't to far off.

Essentially if you draw the shape on a graph,  you can think of a series of trapizoids between each successive points. the areas for each can be split into a rectanlgle ((min(Y,Y-1)*dX)  and a triangle (1/2 abs( dY)*dX)  sum the two and add to the previous area.

And as snippet