I can roughly have a general understanding of LEQ_TOL and TOL_RESID. I also read BiCGSTAB for LEQ_TOL in Matlab Help ( Solve system of linear equations — stabilized biconjugate gradients method - MATLAB bicgstab - MathWorks China) to promote my understanding. In this page, there is a picture in which a line referring to the tolerance for linear equations is marked and I copy this figure here.
However, this line in the former figure is very similar to the line in the residual figure below. For example, the default MAX_NIT=50. The iteration would go to the next time step even if the number of the present iteration is 10, if the residuals of ineration below their TOL_RESID values. The red solid line may be TOL_RESID but how to mark LEQ_TOL in the figure below? LEQ_TOL=1.0e-4 and not all the lines should reach this value during one iteration.
