Multiple plots to same chart in LabVIEW

Question

I am doing a two-channel data acquisition to read out the voltages of two diodes. I am using LabVIEW to do this. Below you can see the part of the code relevant for my question.

The voltages are converted to temperatures by 1D interpolation, as shown in the above code. 0.9755 V corresponds to 2 degrees, 1.68786 V to 100 degrees. For this simple example, I expected the waveform chart to display two constant curves, one at 2 and one at 100. However, it plots only one curve that zigzags between the two values. How can I get two separate plots?

Answer 1

Add "Index Array" at the "yi" output of the "Interpolate 1D VI" function and expand it to two elements. Then put "Bundle" function with two inputs. Connect "Index Array" outputs to them. The resulting cluster connect to the chart.
That's it :)

Explanation: to display multiple plots in the chart, you need to feed it with a cluster, not an array. Your "Interpolate 1D VI" output gives you 2-element array (result of interpolation for 0.9755 and 1.68786), so you need to convert it to a cluster using Bundle function.

Answer 2

The general answer to this question is that if you open the context help and hover over the BD terminal of a graph or chart, you will see the various data types it supports:

This will help if you want to get it right every time, as the various charts and graphs can each take different types of data to display different types of graphs and remembering them can be tricky.