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--- documentation:language_reference:objects:spectra:functions:shift [2016/09/25 23:50] – created Maurits W. Haverkort
+++ documentation:language_reference:objects:spectra:functions:shift [2016/10/10 09:41] (current) – external edit 127.0.0.1
@@ Line 1: / Line 1: @@
+====== Shift ======
+###
+Shifts a spectrum //G// by a constant, i.e. //G<sub>new</sub>($\omega$)=G($\omega$-shift)//
+###
+===== Example =====
+###
+Take the spectra defined in [[documentation:language_reference:objects:spectra:start|definitions.Quanty]] and shift it by 5.3 eV.
+###
+==== Input ====
+<code Quanty Example.Quanty>
+dofile("definitions.Quanty")
+GShift = Spectra.Shift(G, 5.3)
+G.Print({{"file","Spectra.dat"}})
+GShift.Print({{"file","Spectra.Shift.dat"}})
+gnuplotScript = gnuplotHead .. [[
+set output "Spectra.Shift.ps"
+plot "Spectra.dat"  using 1:(-$3  ) title 'T1' with lines ls  1,\
+     "Spectra.Shift.dat"  using 1:(-$3) title 'T1 shifted' with lines ls 2
+]]
+file = io.open("Spectra.Shift.gnuplot", "{{ :documentation:language_reference:objects:spectra:functions:spectra.shift.png?nolink |}}w")
+file:write(gnuplotScript)
+file:close()
+os.execute("gnuplot Spectra.Shift.gnuplot")
+os.execute("convert -density 1024 Spectra.Shift.ps -resize 1024 Spectra.Shift.png")
+</code>
+==== Result ====
+###
+The resulting picture is:
+###
+{{:documentation:language_reference:objects:spectra:functions:spectra.shift.png?nolink |}}
+===== Available functions =====
+{{indexmenu>.#1}}