assign value and plot outside the loop

function [call_value]=different_k(S, r, sigma, t, steps)

call_value=zeros(226,1);

for i=75:300

call_value(i-74,1) =european_call_binomial(S, i, r, sigma, t, steps);
%plot(call_value(i-74,1),i);
end 

x=75:1:300;
y=call_value(1:1,1);
plot(x,y)

I 'm trying to assign the value to call_value. However, the result says call_value has not been defined. Did I made a in call_value(i-74,1)? how should I fix this ?

Answer 1

[ag]

Hi Kingsley,

The variable "call_value" is defined inside the function "different_k", and therefore, accessing it outside the scope of function "different_k" leads to the error "Unrecognized function or variable 'call_value'".

Below is a modified version of your code:

x=75:1:300;
% ensure to define the variables  passed into the function different_k
call_value = different_k(S, r, sigma, t, steps);
plot(x, call_value);

function [call_value]=different_k(S, r, sigma, t, steps)
    call_value=zeros(226,1);
    for i=75:300
        % ensure to provide the function definition of european_call_binomial
        call_value(i-74,1) =european_call_binomial(S, i, r, sigma, t, steps);
    end
end 

For more details, please refer to the following MathWorks documentation: https://www.mathworks.com/help/matlab/ref/function.html#:~:text=Function%20with%20One%20Output

ope this helps!