Logarithmic axes#

Choose a logarithmic axis when equal visual distances represent equal ratios rather than equal numeric differences—for example 1, 10, 100, and 1000.

How to use it#

Set the relevant X or Y scale selector to Logarithmic, then place references and enter their actual positive graph values. Do not enter their logarithms.

Logarithmic calibration requires positive reference values. GraphX continues to show, store, and export the actual graph values; it does not replace them with logarithms.

Technical details#

GraphX applies the logarithmic conversion as part of the coordinate transformation. For a value $v$, the calibrated spacing is based on $\log(v)$, while the reported coordinate remains $v$.

This is why a logarithmic axis can be calibrated from actual labels such as 10 and 1000.