How do I force autoscale to be symmetric about an axis?

[mvilla1122]

Hello everyone,

I have a signal that is displayed on a chart.  The amplitude varies quite a bit, so I was wondering if I could somehow force autoscale to be symmetric about the x-axis.

In other words, I want the y-scale to change so that the 0 is always in the middle.  The maximum and minimum values on the scale would then be Y and -Y.

What happens is sometimes the the positive scale will be larger than the negative scale.  I want to eliminate that.  Any ideas?

Thank you!

[Dennis_Knutson]

Don't use autoscale. You can check the min and max and for whichever has the greatest absolute value, set the chart's min and max with a property node.