r - How do I get a 2D spectrograph given a data.frame? -


i have data in file following format:

timings  measurements 0.12  -32.0 0.15  -5.0 0.18  7.2 (and on, it's tab-deliminited file)

as new r, (indeed, downloaded first time today), how display nice spectrograph shown on pages such http://www.qsl.net/d/dl4yhf///////speclab/specdisp.htm

i've tried tsa::periodogram, , genecycle::periodogram, while seem compute fft me, , display periodogram, want have proper spectograph, not yet confident statistics , don't know if "raw" periodograms or not.

for record, how i've displayed periodogram far:

a = read.table("~/myfile.csv", fileencoding="ascii", header=true) tsa::periodogram(a$measurements)

however ignores a$timings, reason i'm not satisfied results have.

for reference, here type of spectrograph want:

spectrograph www.qsl.net


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