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How to plot a variable


When I iterate a variable in a do-loop it actually will not print out. Is it undefined? In Fortran this would never be a problem, but in mathematica it seems that it must be done different:

Do[  GA = GA + .5*(G[J] + G[J + 1])*DELT ; Amp = Exp[2.*GA] ; 
  JJ = J + 1; ABB[1] = 1; ABB[JJ] = Amp, {J, 1, N1}] ;
pl1 = Plot[ABB, {n, 1, NAX}, PlotLabel -> "Impedans", Filling -> Axis,
   PlotRange -> All]

ABB gives no result..


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