error running the code in while command in bisection method
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umerfunction='x.^3';
x_lower=0;
x_upper=1;
x_mid=(x_lower+x_upper)/2;
i=0;
while(abs(umerfunction(x_mid))>0.0001)
fx=umerfunction(x_mid);
X=[i,fx,x_upper,x_lower];
disp X;
if(umerfunction(x_mid)*umerfunction(x_upper))<0
x_lower=x_mid;
else x_upper=x_mid;
end
ERROR:
Array indices must be positive integers or logical values.
Error in bisection (line 7)
while(abs(umerfunction(x_mid))>0.0001)
how to solve that issue? i m very frustated now regarding solving this.Thanks and honours in advance
采纳的回答
madhan ravi
2018-12-22
umerfunction=@(x)x.^3;
Note: Also your loop is infinite loop since each time the condition will be satisfied either you need to add a break or change the condition.
2 个评论
umer ansar
2018-12-22
madhan ravi
2018-12-23
Anytime :) , before going in depth the first line doesn't seem to work as you think though :
x_mid=(x_lower+x_upper)/2; => ( 0 + 1 ) / 2 => 0.5 , ( 0.5 ) ^ 3 => 0.125
or
( 3 + 4 ) / 2 => ( 3 + 4 ) / 2 => 3.5 , ( 3.5 ) ^ 3 => 42.8750
so what do we observe from the above both the bounds that you try are always greater than 0.0001 , you need to rethink about your formula plus you don't seem to iterate x_mid over and over forever so basically the result becomes useless..
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