So This built in VI works fine when I use my program on labview 6, but in labview 9 it only outputs NaN values. I know this isnt much information to go off of, but is there some compatability issue with this vI here?
While there may have been some changes between versions, the basic functionality should be similar. What does your input data look like? How many samples are in the data set? Can you post the LV9 version (with data) so we can look at it?