  We present a MATLAB toolbox for five different classes of exponential
integrators for solving (mildly) stiff ordinary differential equations or
time-dependent partial differential equations. For the efficiency of such
exponential integrators it is essential to approximate the products of the
matrix functions arising in these integrators with vectors in a stable,
reliable and efficient way. The toolbox contains options for computing the
matrix functions directly by diagonalization or by Pade approximation. For
large scale problems, Krylov subspace methods are implemented as well.
  The main motivation for this toolbox was to provide general tools which on
one hand allows one to easily run experiments with different exponential
integrators and on the other hand to make it easily extensible by making it
simple to include other methods or other options to compute the matrix
functions. Thus we implemented the toolbox to be compatible with the ode
solvers included in MATLAB. Most of the methods can be used with adaptive
stepping.
