Add option to use log-scaled axis

[jvdoorn]

To visually check in which region a certain model works (par example to compare a 1 / x to a 1 / x**2 regime) it is useful to be able to use a log-scaled axis. Would it be possible to add a checkbox for this (near the x_min and x_max fields in the plot window?) for both the x- and y-axis? This then helps establish in which range you want to fit your model.

[davidfokkema]

This would indeed be helpful, but the underlying plot library (PyQtGraph) does not behave well when using a log scale. For example, the error bars do not end up in remotely the same location as the data points without any indication why that may be so. I'll need to figure out where exactly it goes wrong and probably file some bug reports against that library. This will likely take some time.

[davidfokkema]

You can track log-scale PyQtGraph bugs here: https://github.com/pyqtgraph/pyqtgraph/issues?q=is%3Aissue+is%3Aopen+log