terminating the while if loop

while abs(dE) > 1e-12
iteration=iteration+1;
E_old = E;
E = M+(ecc(1)*sin(E));  %eccentric anomaly
dE=E-E_old;
if iteration==1000
warndlg('iteration cannot be converged ', 'Error!', 'modal')
end
end

How can I modify above code to terminate the while loop when iteration exceeds 1000?

Answer 1

[Star Strider]

I would add a break or return in your if block:

if iteration>=1000
    warndlg('iteration cannot be converged ', 'Error!', 'modal')
    return
end

[sermet]

it doesn't terminate while loop because abs(dE) is always higher than 1e-12.

[Star Strider]

change the if condition to:

if (iteration>=1000) || (abs(dE) < 1e-12)
    warndlg('iteration cannot be converged ', 'Error!', 'modal')
    return
end

That should work as you want it to.

Answer 2

[Jan]

limit = 1000;
iter  = 0;
dE    = 1;
while abs(dE) > 1e-12 && iter < limit
  iter  = iter + 1;
  E_old = E;
  E     = M+(ecc(1)*sin(E));  %eccentric anomaly
  dE    = E-E_old;
end

if iter == limit
  warndlg('iteration cannot be converged ', 'Error!', 'modal')
end