How can i modify this for loop to only give "integer indices values"?

function[y]= hw3question1a(t,y)
  y=1;
  h=.02;
  t=0;
  f=(3*exp(-(4*t)))-2*y;
  for i=1:50
      t(i+1)=t(i)+h;
      y(i+1)=y(i)+h*f(t(i),y(i));
      plot(t,y,'r--')
      xlabel('t'); ylabel('y')
      title('Eulers Method for function question1')
  end

Answer 1

[Walter Roberson]

    f = @(t,y) (3*exp(-(4*t)))-2*y;