Sum Scaled Waves of Different Lengths

Wed, 05/07/2008 - 12:04 pm

This function sums scaled waves of different lengths.

dwave = destination wave
wlist = string list of waves to sum

Different lengths are handled by the Interpolate2 operation.

Example
Make three waves using the table edit. Assume they are named wave0, wave1, and wave2 with 6, 3, and 9 points respectively. Add data to the waves. Execute the following three commands on the command line.

SetScale/P x 1,0.5,"", wave2
SetScale/P x 0,2,"", wave1
SumWavesInX(wave2,"wave0;wave1;")


Function

Function SumWavesInX(dwave, wlist)
    wave dwave
    string wlist
   
    variable ic, np, nt, sn
    string theOne
   
    nt = ItemsInList(wlist)
    duplicate/O dwave tmp_dwave, tmp_swave
    tmp_dwave=0
    tmp_swave=0
    np = numpnts(dwave)
    for (ic=0;ic<nt;ic+=1)
        theOne = StringFromList(ic,wlist)
        wave swave = $theOne
        sn = numpnts(swave)
        if (sn!=np)
            interpolate2/I=3/Y=tmp_swave swave
        else
            tmp_swave = swave
        endif
        tmp_dwave+=tmp_swave
    endfor
    dwave = tmp_dwave
    killwaves/Z tmp_dwave, tmp_swave
    return 0
end

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