Autoscale Y only works when upper bound of X is updated?

[Anonymous]

Hi All!

I have a VI that sets the X scale on a waveform graph but uses
LabView's autoscaling feature to set the Y-axis. What I observe is that
the Y scale is updated correctly when I update the upper bound of the X
scale but Y is not updated if I update the lower bound of the X scale.
Any ideas why and whether there is a workaround?

Thanks,

Rudolf

[shoemakesmusic]

I've experienced this problem too.  The only thing i've done to fix it is delete that graph and make a new one.  Don't ask me why that works. 

[MattP]

Hi Rudolf,

I ran a few tests over here, and I was able to get the autoscaling working without trouble when updating either the minimum or maximum bound of the X-axis, in versions 7.1.1, 8.0.1, and 8.20.  I've attached the VI here, please give it a try and let me know if it works for you as well.  If it doesn't, it would be helpful to know what version of LabVIEW that you're using, and if you could also post the smallest piece of code that replicates the problem I'd be happy to take a look at it.

[altenbach]

Depending on your data, it could just be a side-effect of "loose fit" being enabled by default. Try to disable "loose fit" on the y-axis and see if it makes a difference. 🙂