# fast_from_file¶

Runs first few steps of the 'from_file' search, which reads input values from a data file and computes $$\chi^2$$ for each, based on some synthetic data. This test exists only to increase test coverage of the routines. It should not be the basis of any scientific runs. The tolerances are all very loose to make each iteration fast enough that the test completes within a few minutes. The data is taken from the output of a 1 $${\rm M}_\odot$$ model at an age around 1 Gyr.

To increase coverage, this test uses the custom parameters implemented in my_param1, my_param2 and my_param3. Specifically, it sets these to be the efficiency factors for semiconvection, thermohaline mixing and gravitational settling. Only my_param1 and my_param3 are varied.

The output in effect only checks that at least one set of trial parameters returned a value of $$\chi^2$$. There are two main failure modes. First, failure might benignly indicate that the initial parameters have strayed too far from the synthetic constraints to produce any output, in which case the initial guesses or target data should be adjusted. Second, failure might indicate that the search is genuinely broken and needs fixing.

Last-Update: 2022-03-29 (mesa 998d243) by Warrick Ball