%This is the modified myfile.m m-file. This m-file makes several function calls.
% The details of the functions are:
% A function to check if a number is odd or even
% A function that evaluates and returns the result of the equation 
% f(x) = -x/(x^2+a^2)
% A function that plots results.


% first intialize an array a with all numbers from 1 to 100
a = [1:100];

%intialize a variable b with 3
b = 3;

% here i cycle through all the elements in a one by one and ......

for i = 1:max(size(a)) % loop through all ements of a

% .......I call function chkevod (for check even or odd) which accepts the present element of a and the number 2 as inputs and 
% the resulting output of this function is put in variable rmndr (remainder)


rmndr = chkevod(a(i),2);    % call function chkevod

% if the remainder is zero, I evaluate the function within the "if" statement ie I evaluate the function and assign the result into 
% an array c only if the independent variable 'a(i)' is even


if rmndr == 0
    c(i) = sin(a(i))+b;
end

% I make a call to function getrslt (get result) regardless of the a(i) being even or odd and assign the result to an array f

   f(i) = getrslt(a(i),b);   % call function get result, which evaluates the function f(x) = -x/(x^2+a^2)
end


% Now I initialize a figure window with the command figure
figure(1)
% and call the function plotter which accepts the array f as its input
plotter(f)

% I do the same with another figure window

figure(2)
plotter(c)