On exit: the approximate derivative of the solution component
${y}_{i}$, as supplied in
${y}_{i}$ on output from the integration routine at the output value of
T. These values are obtained by the evaluation of
${y}^{\prime}=f\left(x,y\right)$ except when the output value of the parameter
T in the call to the integration routine is
TOUT and
${\mathbf{TCURR}}\ne {\mathbf{TOUT}}$, in which case they are obtained by interpolation.