Multiple y-axis with different scaling

[R.Seco]

Hello,

I would like to create a line chart with multiple series having the
respective number of y-axis. The goal is to represent various
variables on the same chart but with different y scales. Is this
possible in the current library? If not, can you indicate me an
alternative solution? Thanks.

R.Seco

[lrobb]

http://dygraphs.com/tests/two-axes.html

[R.Seco]

In this example only to y-axis are shown. Is it possible to show more
than 2 y-axis (e.g. 4 y-axis on left side) with different colors and
scales?

[Neal Nelson]

I added the capability to have as many independent axes as you like, which we use in production. Only one axis is currently displayed at a time, coloured to match the data series. Unfortunately my changes have not been accepted back into the project.

You could always use my branch if you like, but the main line has developed further since then.

Here's the link to my changes: https://github.com/danvk/dygraphs/pull/53

[R.Seco]

Thank you for your help Neal Nelson.

[Dan Vanderkam]

I've always been reluctant to support >2 y-axes in dygraphs. If you
have three or more y-axes on a single chart, it's usually a sign that
you need to re-think what you're charting. This is a fairly common
restriction. Microsoft Excel only supports two y-axes, for instance.

If you need to do this, you can work around the restriction by
re-scaling your data and undoing the scaling in a valueFormatter. Or
at least you will be able to soon:
http://dygraphs.com/preview/tests/multi-scale.html

I'm hoping to integrate the changes to valueFormatter in the next week.

- Dan

[R.Seco]

Hi Neal,

I'm using the capability you developed and suggested. I would like to
know if it is possible to dynamically change the y-axes scales. In the
example you present, "3 plots, one Y axis shown (fixed scales)", you
predefine the y-axis max and min values. How could I dynamically
define the different axis limits with, for example, html text boxes?
Thank you for your help.

R.Seco

[JohnV]

Hi Neal.  We also have a need for multiple Y-axis support, and I wanted to try your solution.  I've downloaded your changes, but when I try to generate the dygraph-combined.js file by running generate-combined.sh, it just creates an empty file.  Any idea what I might be doing wrong?

[vanessa]

Hi everyone,
I am currently using Dygraph 2.2.1 and I need to have multiple y-axis (more then 2) as aked by R.Seco. 
I tried to perform the re-scaling suggested by Dan, but every time the y-axis range is changed (feature available to the user of my charts), I need to re-scale all the data in the chart.
Is there any another solution available that would not involve all these computations?
Thanks in advance for any help.