I code a bisection method on MATLAB app designer, how can I fix this error ?

typefunction = app.TypefunctionEditField.Value;
a = app.aEditField.Value
b = app.bEditField.Value
run = app.RunButton.ButtonPushedFcn
error= app.errorEditField.Value
fxi=str2func(['@(x)'typefunction]);
number_of_iterations=0;
if fxi(a)*fxi(b)>0
    result=NaN;
    return
end

if fxi(a)==0
    result=a;
    return
elseif fxi(b)==0
    result=b;
    return
end

while(abs(a-b)>=error)
    result=(a+b)/2;
    if fxi(a)*fxi(result)<0
        b=result;
    else
        a=result;
    end
    number_of_iterations=number_of_iterations+1;
end

[shachinee]

hey can i get the full coding of it

Answer 1

[Walter Roberson]

fxi=str2func(['@(x)'typefunction]);

You need a space or comma, like

fxi=str2func(['@(x)' typefunction]);

[Anne]

i fix it but it still have same error :(

[Walter Roberson]

I copied your posted code into the editor, and added in the one space that I indicate, and that cleared up the error message. There are still warnings recommending that you add in semi-colons to prevent unnecessary output, but the error is gone just by putting in that one space.