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function f=fun(x) %Ïȶ¨ÒåÁËÒ»¸öfunº¯Êý f=exp(x)-1 end ---------------------------------------------- function m=newton(a,d,max) %ÕâÊÇÖ÷º¯Êý x(0)=a; for k=0:max f(x(k))=fun(x(k));y(x(k))=diff(fun(x(k))) %ÕâÀïÖ±½Óµ÷ÓÃfunº¯ÊýûÎÊÌâ°É x(k+1)=x(k)-f(x(k))/y(x(k)); disp(sprintf('%d %f ',k,x(k))); if abs(x(k+1)-x(k))<d break end end end ---------------------------------------- ÒÔÉÏÊÇÖ÷³ÌÐòÄÚÈÝ£¬ÔËÐÐÖ¸ÁîÊÇ m=newton(1,0.0001,30) È´³öÏÖÒÔÏ´íÎó Attempted to access x(0); index must be a positive integer or logical. Error in newton (line 2) x(0)=a; |
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