Common mistakes
From GOSIA
| Line 1: | Line 1: | ||
| - | ==Too many fit parameters (forgetting the overall normalization parameter)== | + | ==Too many fit parameters (e.g. forgetting the overall normalization parameter)== |
This problem will not cause an error to be reported by Gosia. | This problem will not cause an error to be reported by Gosia. | ||
| Line 32: | Line 32: | ||
The meshpoint [[integration_subdivisions | subdivisions]] can be tested to see if increasing the number of subdivisions will allow for fewer required meshpoints. Increasing the number of meshpoints significantly increases the calculation time, but increasing the number of subdivisions does not. (It is probably wisest to pick 50 or 100 subdivisions and then test for the required number of meshpoints for convergence.) | The meshpoint [[integration_subdivisions | subdivisions]] can be tested to see if increasing the number of subdivisions will allow for fewer required meshpoints. Increasing the number of meshpoints significantly increases the calculation time, but increasing the number of subdivisions does not. (It is probably wisest to pick 50 or 100 subdivisions and then test for the required number of meshpoints for convergence.) | ||
| + | |||
| + | ===Convergence of the coupled-channels calculations=== | ||
| + | |||
| + | In order to ensure convergence in the point cross sections, it is best to prevent Gosia from trying to reduce the step-size used in the collision trajectory. This is done by adding the "INT," control to the CONT section of the input. (Refer to "CONT" in the Gosia manual.) To turn off the step-size reduction, add | ||
| + | |||
| + | <pre> | ||
| + | INT,X. | ||
| + | 1, 1000 | ||
| + | 2, 1000 | ||
| + | ... | ||
| + | </pre> | ||
| + | |||
| + | where X is the number of experiments in the input, and 1, 2, ... are the experiment numbers 1 through X. The decimal point is required after X. | ||
