Read from a XY graph

[vipulkumar731]

I made a XY graph from an array. I want to read the corresponding value of X from a graph. Is it possible to do this ?

[RavensFan]

You know the data going in.  So you can use Threshold 1D Array and Interpolate 1-D array to get the corresponding X value for any given Y value.

[vipulkumar731]

Can you tell me how to do that ?

[RavensFan]

See this older thread.

http://forums.ni.com/t5/LabVIEW/Finding-a-Y-value-for-a-given-X-value/m-p/2490730

Altenbach's message in that thread http://forums.ni.com/t5/LabVIEW/Finding-a-Y-value-for-a-given-X-value/m-p/2490820#M760269 was the best implementation and only required a cluster and an interpolate 1-D array.

[vipulkumar731]

I tried to do that but I m not getting any ans.

I want the left one to be my Y and the right to be my X.

Please check this

[RavensFan]

I don't know what you are referring to when you talk about the left one vs. the right one.

There is something I had forgotten about with Interpolate 1-D array.  And I'm not finding it clearly documented in the help for that function right now.  But I believe it requires the numbers for Y to be in an increasing order.

So try putting in a Reverse 1-D array for both the X and Y inputs before bundling them in the cluster.