On entry: values to be used to control step size choice during integration. If any
CONi=0.0 on entry, it is replaced by its default value described below. In most cases this is the recommended setting.
CON1, CON2, and CON3 are factors used to bound step size changes. If the current step size h fails, then the modulus of the next step size is bounded by CON1×h. The default value of CON1 is 2.0. Note that the new step size may be used with a method of different order to the failed step. If the initial step size is h, then the modulus of the step size on the second step is bounded by CON3×h. At any other stage in the integration, if the current step size is h, then the modulus of the next step size is bounded by CON2×h. The default values are 10.0 for CON2 and 1000.0 for CON3.
Constraints:
These constraints must be satisfied after any zero values have been replaced by default values.
- 0.0<CON1<CON2<CON3;
- CON2>1.0;
- CON3>1.0.