Having trouble with Interpolate 1D array

[cohara85]

Hello,

I am new to Labview, and I am having trouble with the Interpolate 1D array function. I have attached a sample vi and some sample data.

What I find is that the interpolated y-values produced are just the first n number of y-values input in the array of numbers, where n is the number of y-values required. I am obviously misunderstanding something, but as far as I am aware the array of numbers that I am inputting (in the rawData example file attached) corresponds to a cluster of x and y-coordinates, as shown here: http://zone.ni.com/reference/en-XX/help/371361J-01/glang/interpolate_1d_array/.

I have also examined the Labview interpolate example and examined this thread: http://forums.ni.com/t5/LabVIEW/Can-you-give-me-an-example-using-the-vi-interpolate-1d-array-vi/m-p/... but both just deal with fractional indexes rather than x-values.

Any help inunderstanding ,y mistake would be appreciated.

[GerdW · Accepted solution]

Hi cohara,

I guess you want to interpolate Y values (from 2nd column) based on X values (in 1st column).

Try this:

(It's an Index&BundleClusterArray function inside…)

[cohara85]

Thank you GerdW.

Is see now what is meant by a cluster.

However I am now getting the rror message: 'The type of the source is cluster of 2 elements. The type of the sink is a 1-D array of double.' Does this imply that the interpolate function cannot accept a clustered input? I am using Labview 7.1.

[GerdW]

Hi cohara,

did you disable autoindexing on the input tunnel as is shown in my snippet?

[cohara85]

Thanks again GerdW,

I hadn't disabled autoindexing. It's working now 🙂