Create a right axis which correspond to the first axis.

Hello guys. Badly need help. I have a wavenumber-frequency plot. I would like to add a right axis, but in period (1/frequency). Please help with the command. Below is my sample plot. Thank you very much.

[KSSV]

https://in.mathworks.com/help/matlab/creating_plots/plotting-with-two-y-axes.html

[Mac]

Thanks mate. This (link) shows plotting different data. Mine is the same data but I want the right axis to be in period (1/f). Thank you mate.

Answer 1

[Chunru]

freq = [1000:10:5000];
wn = [-1.5:0.01:1.5];
p = 1./freq;

h1= axes;
data = randn(length(freq), length(wn));
imagesc(wn, freq, data);
axis xy

% create another axes with same position
% h2 = axes('Position', h1.Position, 'Color', 'none', 'YLim', h1.YLim, 'XTick', [], ...
%     'YAxisLocation', 'right', 'YTickLabel', sprintf('%.2e\n', 1./h1.YTick), 'FontSize', 8);
rightytick = [2.5 3 4]*1e-4;
rightytick = flip(rightytick);
h2 = axes('Position', h1.Position, 'Color', 'none', 'YLim', h1.YLim, 'XTick', [], ...
    'YAxisLocation', 'right', ...
    'YTick', 1./rightytick, 'YTickLabel', sprintf('%.2e\n', rightytick), 'FontSize', 8);

[Mac]

Thank you Chunru. Appreciate it a lot. I'd like to plot only selected periods (like the one showed below). How do I do it? Thank you very much.

[Chunru]

See above.

[Mac]

Thank you very much.