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documentation:language_reference:objects:spectra:functions:multiplybyenergy [2016/09/25 23:44] – created Maurits W. Haverkortdocumentation:language_reference:objects:spectra:functions:multiplybyenergy [2025/11/20 04:20] (current) – external edit 127.0.0.1
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 +====== MultiplyByEnergy ======
  
 +###
 +Multiplies a spectrum //G($\omega$)// by its energy, i.e. //G<sub>new</sub>($\omega$) = $\omega\times$G($\omega$)//.
 +###
 +
 +===== Example =====
 +
 +###
 +Take the spectrum defined in the file [[documentation:language_reference:objects:spectra:start|definitions.Quanty]] and multiply it by its energy.
 +###
 +
 +==== Input ====
 +<code Quanty Example.Quanty>
 +dofile("definitions.Quanty")
 +
 +GOmega = Spectra.MultiplyByEnergy(G)
 +G.Print({{"file","Spectra.dat"}})
 +GOmega.Print({{"file","Spectra.MultiplyByEnergy.dat"}})
 +
 +gnuplotScript = gnuplotHead .. [[
 +set output "Spectra.MultiplyByEnergy.ps"
 +plot "Spectra.dat"  using 1:(-$3  ) title 'T1' with lines ls  1,\
 +     "Spectra.MultiplyByEnergy.dat"  using 1:(-$3) title 'T1 * Energy' with lines ls  2
 +]]
 +
 +file = io.open("Spectra.MultiplyByEnergy.gnuplot", "w")
 +file:write(gnuplotScript)
 +file:close()
 +
 +os.execute("gnuplot Spectra.MultiplyByEnergy.gnuplot")
 +os.execute("convert -density 1024 Spectra.MultiplyByEnergy.ps -resize 1024 Spectra.MultiplyByEnergy.png")
 +</code>
 +
 +==== Result ====
 +###
 +The resulting picture is:
 +###
 +{{:documentation:language_reference:objects:spectra:functions:spectra.multiplybyenergy.png?nolink |}}
 +
 +===== Available functions =====
 +{{indexmenu>.#1}}

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