how to remove the error

the error:

Error in fminbnd (line 233)

x= xf; fx = funfcn(x,varargin{:});

Error in untitled (line 5)

minr = fminbnd(@areaR,0,10),

my code:

%% Q11
clc;clear
global V
V = 10;
minr = fminbnd(@areaR,0,10),
minh = (3*V/(pi*minr^2)),
minA = areaR(minr),
 
r = 1:0.1:5;
A = areaR(r);
plot(r,A);
xlabel('r');
ylabel('Area');
 
Ua = minA+0.1*minA;
Lr = r(A < Ua & A >minA);
Range_r = max(Lr) - min(Lr)

[Walter Roberson]

You do not show us the complete error message and you do not show us the code for areaR

Answer 1

[Urmila Rajpurohith]

Hi Yusuf

As you mentioned

error in fminbnd (line 233)
x= xf; fx = funfcn(x,varargin{:};

probably you would have got error message saying: “User supplied objective function must return a scalar value.”

It means the variable “fx” accepts only scalar values.

In this case the “funfcn” is “@areaR” which is not resulting a scalar output.So try to modify the “areaR” function so that it will result a scalar output.