高等工程數(shù)學(xué)習(xí)題二參考答案-資料下載頁(yè)
2025-06-05 21:52本頁(yè)面
【正文】 ：，所以，所以，即，%P219 ex15.x = [0 1 2 4]。y = [ ]。yl = log(y)。plot(x,yl,39。o39。)axis([min(x) max(x)+ min(yl)1 max(yl)+1])p = polyfit(x,yl,1)。xp = linspace(min(x), max(x)+,100)。yp = polyval(p,xp)。hold onplot(xp,yp)注意：也可用lsqcurvefit命令直接求，效果會(huì)更好一些。：%P219 ex16.x = [ 0 ]。y = [ ]。p1 = polyfit(x,y,1)。xp = linspace(min(x), max(x)+,100)。yp1 = polyval(p1,xp)。p2 = polyfit(x,y,2)。yp2 = polyval(p2,xp)。p3 = polyfit(x,y,3)。yp3 = polyval(p3,xp)。plot(x,y,39。.39。,xp,yp1,xp,yp2,xp,yp3)legend(39。數(shù)據(jù)點(diǎn)39。,39。一次擬合多項(xiàng)式39。,39。二次擬合多項(xiàng)式39。,39。三次擬合多項(xiàng)式39。)axis([min(x) max(x)+ min(y)1 max(y)+1])10
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