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dengwei_19木蟲 (著名寫手)
鐵齒金不換誠實可靠小郎君
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[求助]
現(xiàn)在做到高斯函數(shù)的誤差函數(shù)一步,又是一個方程不知道用matlab怎么寫
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無機非金屬精華討論集 |
榮譽版主 (著名寫手)
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專家經(jīng)驗: +4 |

金蟲 (職業(yè)作家)

木蟲 (著名寫手)
鐵齒金不換誠實可靠小郎君
榮譽版主 (著名寫手)
![]() |
專家經(jīng)驗: +4 |
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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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