====== 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}}