I want to add several fluorescence spectra. They are lists of the format
spectrum 1 = {{x1,y11},{x2,y12},{x3,y13},...}
spectrum 2 = {{x1,y21},{x2,y22},{x3,y23},...}
I want to create a list with the original x-values, but the y-value being the y-value of list 1 + y-value of list 2 + ..., so in code:
result = {{x1,y11+y21},{x2,y12+y22},{x3,y13+y23},...}
Please notice that I will have approx. 50 lists that have to be added, not two.
Additional problem: Some of the lists have different length since they comprise a different wavelength-range. For example a list that doesn't start with x1:
list 7 = {{x4, y71},{x5,y72},{x6,y73},...}
Thanks.