how to plot a spectogram changing the time axis by the input frequency axis of the excitation signal instead?

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student 2015-3-19

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https://ww2.mathworks.cn/matlabcentral/answers/184031-how-to-plot-a-spectogram-changing-the-time-axis-by-the-input-frequency-axis-of-the-excitation-signal

Hi I want to plot a spectrogram of a measured Signal, the Response of a System to a sweep Signal in a certain frequency range. I would like to Analyse the spectra of the Signal at frequency Points and not at time Points, as what I am trying to anlyse is, if when applying a Signal with a certain frequency to the System, I obtain spectra at multiples of that frequency. That is, I would like to transform the time axis to a frequency axis instead.

I would be very grateful if somebody could help me...