function [x,U]=my_int(f,I,ua,h)
% my_int - solves the initial value problem u'(x)=f(x), u(a)=ua
%  
%   Syntax: 
%           [x,U]=my_int(f,I,ua,h)
%   Arguments: 
%           f   - string containing the name of a function file,  
%                 for example, f='funk'
%           I   - 1x2 matrix, specifying an interval I=[a b]
%           ua  - real number, the  initial value
%           h   - positive number, the stepsize
%   Returns: 
%           x -  a vector, the set of nodes x(i)
%           U -  a vector, U(i) is the approximate solution at 
%                the point x(i)
%   Description:
%           The program computes an approximate solution of the initial 
%           value problem  u'(x)=f(x), a<x<b; u(a)=ua, according to  
%           the algorithm in the Fundamental Theorem of Calculus. 
%           The function, whose name is contained in f, must return
%           the function values y=f(x).  For example, if  f='funk',
%           then the file funk.m must begin with "function y=funk(x)".
%           The program uses constant stepsize h.  
%   Examples: 
%           [x,U]=my_int('cos', [0, pi/2], 0, 1e-3) 
%           computes an approximation of sin(x). 
%           plot(x,U) plots the solution. 
% 
%   See also:  quad, quadl 
%           

%----------------------------------------------------------------------
%   Bugs:
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%   Date created: 
%          
%   Author:  
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%   Change history:
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%------------------------------+---------------------------------------+

Write your program here! 

% Hint:   

% while x(i)<b 
%   i=i+1;
% end