for loop in a for loop does not work

I'm having a problem with my script about my final project.So I have 2 variables and basicly x starts with 10 then goes to 500 with every time t increase with a 0.25 range.(tinitial=0.25) And with every step of this the variables should stop when y almost equals to 250. So I used for loop in a for loop. But when I run the code it gives value of y=-503.7667. I couldnt see where the problem is. Here's my script;

[Ameer Hamza]

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Answer 1

[Ameer Hamza]

This just means that y never come close to 250 with a margin of 0.1, Try increasing the margin

if abs(y-250)<10

Or check what are the values of y produced by the loop by saving all the values

count = 1;
for x=10:10:500
  for t=0.25:0.25:11.15
      y(count)=2*sqrt(E*t)*tan(alfab)*((1/sqrt(pi))*exp(-(x/2*sqrt(E*t))^2)-(x/sqrt(E*t))*erfc(x/(2*sqrt(E*t))));
      count = count+1;
  end
end

And from values in y vector, you can check what are the values taken by y and how much closer to 250 does the value come.