Tutorial (.pdf) - University of Melbourne

More documents

Recommendations

Info

Signal processing… ; add some noise noise=randomu(seed,npts) sn=s+noise plot,t,sn specn=fft(sn,-1) delf=1d0/delt f=findgen(npts/2)*delf plot,f/1000.0,10.0*alog(abs(specn(0:npts/2-1))^2), xtitle='kHz',ytitle='PSD' © Robert E. Scholten 2001, 2005 12
Frequency domain filtering ; frequency domain filtering, 20dB suppression around f0 f0=350*delf & fsig=25*delf filter=fltarr(npts/2) ;using only half spectrum - throw away phase filter(*)=1.0d0 fpts=where(abs(f-f0) lt fsig) filter(fpts)=filter(fpts)*1d-4 filtspec=spec(0:npts/2-1)*filter sigfiltered=fft(filtspec,1) plot,t,s1+s2 oplot,t*2,sigfiltered*2,col='0000ff'x … ,xrange=[0,0.2] © Robert E. Scholten 2001, 2005 13
Page 1 and 2: IDL tutorial for physicists 0011 00
Page 3 and 4: Help! • Online hypertext help: ?
Page 5 and 6: Sample IDL session baker~> idl IDL
Page 7 and 8: Main Level Programs In your favouri
Page 9 and 10: Signal processing ; add some more c
Page 11: Signal processing… ; make plot a
Page 15 and 16: Multiple plots © Robert E. Scholte
Page 17 and 18: Contrast tv,img>100 ; whichever is
Page 19 and 20: Resizing ; resizing img2=rebin(img,
Page 21 and 22: Fourier image processing ; experime
Page 23 and 24: 3d surfaces window,xsize=512,ysize=
Page 25 and 26: Programming: procedures pro factori
Page 27 and 28: Printing with IDL: postscript • P

Tutorial (.pdf) - University of Melbourne

Create successful ePaper yourself

Delete template?

Save as template?