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7Â¥2012-04-13 14:43:37
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3Â¥2012-04-13 13:53:05
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dengwei_19: ½ð±Ò+6, ¡ï¡ï¡ïºÜÓаïÖú 2012-04-13 14:36:22
dengwei_19: »ØÌûÖö¥ 2012-04-13 15:40:01
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dengwei_19: ½ð±Ò+6, ¡ï¡ï¡ïºÜÓаïÖú 2012-04-13 14:36:22
dengwei_19: »ØÌûÖö¥ 2012-04-13 15:40:01
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>> syms x >> syms w;int(exp(-x^2),0,w) ans = (pi^(1/2)*erf(w))/2 >> syms w;int(exp(-x^2),0,-w) ans = -(pi^(1/2)*erf(w))/2 =========== >> fun=@(x)-5.4*(pi^(1/2)*erf(10*2^0.5./x))/2-2.8*(pi^(1/2)*erf(40*2^0.5./x))/2+2.6; >> x=0.1:0.1:100; >> y=feval(fun,x); >> plot(x,y) >> [x,feval,flag]=fsolve(fun,80) Equation solved. fsolve completed because the vector of function values is near zero as measured by the default value of the function tolerance, and the problem appears regular as measured by the gradient. x = 81.4787 feval = -9.0775e-010 flag = 1 |
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