MATLAB: Error running the code in while command in bisection method

bisection methodMATLAB

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

Best Answer

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.
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