Is it possible to create a slider with a logarithmic scale within MATLAB 7.6 (R2008a)?

I would like to create a slider whose value changes on a logarithmic scale, not a linear scale.

Answer 1

[MathWorks Support Team]

The ability to specify a logarithmic scale for a slider is not available in MATLAB 7.6 (R2008a). To implement such a slider, you will need to convert its linear value into a logarithmic value before using it in your GUI.

For example, the following slider has a range of 10^0 to 10^2:

range = [10^0 10^2];

h = uicontrol('style', 'slider', ...

      'position', [50 50 200 20],...

      'min', log10(range(1)),...

      'max', log10(range(2)),...

      'callback', @(src,event)set(src,'UserData',10^get(src,'Value')));

To query the value of the slider, now you would need to query its "UserData" property instead of its "Value" property. For example,

get(h, 'UserData')

This slider has a leftmost value of 1 and a rightmost value of 100. Notice how the center value is 10, not 50.