I am trying to plot the profile (lambda x) of a 2D FFT image on a 2D graph with pixel values on a bottom X axis (ranging from -255 to 256) and the corresponding wavelength values (lambda (nm)) on a top X axis (here ranging 0.13 ... +inf ... 0.13). I also want to have some precise values written on the top axis with tick-indexed dataset (which I tried to do using Tick labels > Type: Tick-indexed dataset). I have tried to use a reciprocal X axis at the top, but the problem is that the value corresponding to 0 at the bottom would be infinite at the top. I also tried to have a 2nd and a 3rd layer corresponding respectively to the [-255; 0[ and ]0; 256] intervals, but it does not seem to work (top axis with a wrong scale or indexed ticks at the wrong place), even when trying to introduce some breaks towards infinity.
Linear and non linear X axis (bottom and top)
Posted - 06/10/2010 : 09:41:45 AM
