MATLAB Answers

Better data tip for Polar graph

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Trevor
Trevor on 7 Aug 2011
Answered: Mike Garrity on 12 May 2016
Is there any way to make Matlab give polar coordinates when placing a data tip on a graph instead of Cartesian?
And really, why on earth does Matlab not do that in the first place?

Answers (3)

Oleg Komarov
Oleg Komarov on 8 Aug 2011
At the end of the documentation of datacursormode you will find example on how to customze the text of the tip.

George Sterling
George Sterling on 12 May 2016
Edited: George Sterling on 12 May 2016
% This function changes data tips from cartessian to polar coords
function polar_datacursormode
dcm_obj = datacursormode(gcf); set(dcm_obj,'UpdateFcn',@myupdatefcn)
function txt = myupdatefcn(empt,event_obj) % Customizes text of data tips
pos = get(event_obj,'Position');
R = sqrt(pos(1)^2 + pos(2)^2);
Theta = atand(pos(2)/pos(1));
if Theta < 0 Theta = Theta + 360; end
txt = {['R: ' num2str®], ... ['Theta: ' num2str(Theta)]};

Mike Garrity
Mike Garrity on 12 May 2016
The new polarplot function in R2016a does this for you.

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