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xdata=[0.00005 0.00015 0.0002 0.00025 0.0003 0.00035 0.00045 0.00055 0.0006 0.00075 0.00085 0.00095 0.001 0.00115 0.00125 0.00145 0.00155 0.00175 0.00205 0.00245]

ydata=[0.706 0.665 0.652 0.624 0.599 0.574 0.545 0.526 0.492 0.472 0.450 0.434 0.426 0.402 0.387 0.369 0.364 0.345 0.338 0.330]

[ Last edited by Ìì±ß5328 on 2010-4-3 at 17:35 ]
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ff=inline('0.723+(0.330-0.723)./(2.*0.00002).*(x+1./k(1)+0.00002-((x+0.00002+1./k(1)).^2-4.*0.00002.*x).^0.5)','k','x')

[xx,res]=lsqcurvefit(ff,[1e3],xdata,ydata);


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