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HELP with Interpolate vi

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Hello everyone our project is now facing a problem in LabView.

We need to build a function using the labview that could output a dependent y value when input a independent x value.

eg. when get 6.7 from NI 9263, output should be 100 for further education. When get 6.1, output should be 50...

 

I've already build two arrays for my X, Y value,  I try to use Spline Interpolate vi , Interpolate 1D vi, these two functions.

But when use Spline Interpolate, the indicator for y value is 'NaN'.

When use Interpolate 1D, the indicator for y even doesn't show anything....

I attach our two programs here. Could anyone help us with it?? Or could you give us another way to solve it!!!!

Really Really thank you!!!!!!

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