OK, I'm forewarned by Blokk's response that you are (mis-)using the DAQ Assistant (I wrote an essay for one of my colleagues called "The Dreaded DAQ Assistant" a while ago) and (even worse!) Dynamic Wires. These are fine for NI Travelling Road Shows, where Sales people come to colleges and try to demonstrate how quickly you can do something in LabVIEW, which usually goes over like a lead balloon, and never touches on the real strengths of LabVIEW, nor why it might be a better tool for an Engineer than, say, M**l*b, but that's another rant.
Do a Web Search for "Learn 10 Functions in NI-DAQmx", download the NI White Paper that it finds for you, read it, and stop using the DAQ Assistant. When you use DAQmx Read functions, you'll have a (more logical) choice of outputs, depending on what you are sampling -- 1D Dbl, Waveform, 2D Dbl, 1D Waveform, etc.
Now think about what it is you want to plot, namely Position vs Force, both of which are read from DAQ channels. You are plotting them in a chart, which plots one or more channels against time, assumed to be uniformly advancing (which is why it is called a waveform chart). You want to plot X vs Y -- this requires a LabVIEW X-Y graph. Read the LabVIEW Help for Graphs, look at the examples, and incorporate this new knowledge into your design.
I don't know your background, but LabVIEW, while it is an Engineering tool (the "E" in LabVIEW is for "Engineering"), is also designed for the Scientist/Experimentalist. When you are trying to figure out how to do something in LabVIEW (like create an XY graph of sampled data), "do an Experiment" and write a tiny throw-away VI that tests things for you. For example, use a For Loop to create 10 "random" (or non-random, for that matter) X points and 10 Y points, bringing them out as 2 1D Arrays. Figure out how to plot them against each other. You should be able to do this fairly easily, will "learn how" to do this, and can then use this knowledge as a "known feature" of your larger program. By breaking your larger program/project into smaller testable pieces, you will have a much easier time getting it to work.
Bob Schor
