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documentation:language_reference:objects:spectra:functions:sum [2016/09/25 23:59] – created Maurits W. Haverkortdocumentation:language_reference:objects:spectra:functions:sum [2025/11/20 04:20] (current) – external edit 127.0.0.1
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 +====== Sum ======
  
 +###
 +Sums the different elements of a spectrum object multiplied by the numbers given as a list in the input. Several lists are possible. Can be used to calculate the temperature dependence of a set of spectra.
 +###
 +
 +===== Example =====
 +
 +###
 +Create the sum of the spectra created with operator //T2// and //T3// and calculate a weighted sum over the spectra created with operator //T1//, //T2// and //T3//.
 +###
 +
 +==== Input ====
 +<code Quanty Example.Quanty>
 +dofile("definitions.Quanty")
 +
 +G2plus3 = Spectra.Sum(G,{0,1,1},{-0.3,0.5,1.0})
 +
 +
 +G.Print({{"file","Spectra.dat"}})
 +G2plus3.Print({{"file","Spectra.Sum.dat"}})
 +
 +gnuplotScript = gnuplotHead .. [[
 +set output "Spectra.Sum.ps"
 +plot "Spectra.dat"     using 1:(-$3+16) title 'T1'    with lines ls  1,\
 +     "Spectra.dat"     using 1:(-$5+12) title 'T2'    with lines ls  2,\
 +     "Spectra.dat"     using 1:(-$7+8 ) title 'T3'    with lines ls  3,\
 +     "Spectra.Sum.dat" using 1:(-$3+4 ) title 'T2+T3' with lines ls  4,\
 +     "Spectra.Sum.dat" using 1:(-$5   ) title '-0.3 T1 + 0.5 T2 + 1.0 T3' with lines ls  4
 +]]
 +file = io.open("Spectra.Sum.gnuplot", "w")
 +file:write(gnuplotScript)
 +file:close()
 +
 +os.execute("gnuplot Spectra.Sum.gnuplot")
 +os.execute("convert -density 1024 Spectra.Sum.ps -resize 1024 Spectra.Sum.png")
 +</code>
 +
 +==== Result ====
 +###
 +The resulting picture is:
 +###
 +{{:documentation:language_reference:objects:spectra:functions:spectra.sum.png?nolink |}}
 +
 +===== Available functions =====
 +{{indexmenu>.#1}}

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