Allow X-Axis Logarithmic Scale

[kanemcnamara]

Summary

Allow X-Axis to be a logarithmic scale

API Changes

Introduce additional options to the xaxis configuration:

• logBase (default: 10)
• logarithmic (default: false)

This should mirror the current y-axis implementation

Sample Use

xaxis: { categories: frequency, logarithmic: true, logBase: 10 }

Intended Use Case

Plotting a frequency response it is common to provide the frequency on the x-axis and the gain on the y-axis. A frequency response should be logarithmic as it mimics the way that humans perceive frequency.

[beldogueto]

A log(value+1) would also be nice.

I am using something like:

xaxis: {
labels: {
formatter: function(value) { return Math.log2(value) }
}
}

You can also try Math.log10(value)

[TashaStenner]

+1 This feature request