MATLAB: How to plot a function

functionplot

Helli, i'm a newbie in mathlab and i try for hours to make the program below, please would you explained me how to begin or make the program and write the code to see where i make some mistake.
Write a program that recieve as arguments two real numbers a and b with a>0 and b∈(0,1) and who represent graphic in cartesian coordinate function f:[0,2]->R.
       { (a*x)/(x^2+b), x∈[0,1]
f(x)=  {
       { ln(x^2-3*x+3), x∈(1,2]
with dashed line and black color. The program display an error message if the requirements about arguments are not respected.
Thank You!!

Best Answer

Some ideas here
function y=new(a,b)
if(a<0)
  disp('a must be bigger than zero');
end
if(b<0||b>1)
  disp('a must be bigger than zero and smaller than 1');
end
x=0:0.1:2;
y=zeros(1,length(x));
for k=1:length(x)
  if (x(k)<1)
  y(k)=(a*x(k))/(x(k)^2+b);
  else
  y(k)=log(x(k)^2-3*x(k)+3);
  end
end
plot(x,y)
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