How to superimpose 2 graphes with different axises?

[manson]

I've 2 graphs(pressure vs time, and temperature vs time), and I'd like to put them into 1 single graph. How could I do that? Thanks.

[LucaP.]

Hi Manson,

Right click on the x or y axis and select DUPLICATE SCALE and SWAP SIDES if you need to. You can define which plot belongs to which x or y axis in the properties page of the graph or in the plot legend.

Hope this helps.

Regards,
Luca

[manson]

This is exactly what I want to do. Thanks!

[manson]

One more question... After the superimposing, I've 2 scales (pressure and temperature) on my y-axis, so I'm supposed to have also 2 inputs (pressure and temperature) right. But the graph icon only takes 1 input. Should I use an array to hold the 2 inputs and then wire the array output to the graph input? Do I need to take the transporse of the array? (Sorry I'm new to LabVIEW) Thanks.

[altenbach]

Yes, you need to build a 2D array from your 2 1D arrays (Use Build array from the array palette). Don't transpose anything.

Now you also need ot expand the legend to show two traces. Righ-clicking will let you select which axis should be used for each. (see image)

[manson]

I see. Thanks altenbach.