Export the SFR of a galaxy

[Antoine-epfl]

Hi
I’m trying to export the SFR of a galaxy using the parametric_sfh template library but I have issues in adding the sfr parameter in the model parameters.
During the minimization, I receive the following error: “ValueError: Method 'lm' doesn't work when the number of residuals is less than the number of variables.”

I can’t find how to solve this issue, do you have any idea?

[bd-j]

Hi, sorry I'm still not sure what you're trying to do. Can you include a code snippet showing how you "add the sfr parameter in the model parameters"?

[Antoine-epfl]

I want to obtain a SFR estimation of a galaxy. I used the Demo code and tried to adapt it to get the SFR in output, which is not given by the paramtric_sfh model.

[bd-j]

An "sfr" parameter has no meaning for the non-parametric SFH (or indeed any of the SFHs), just adding it to the model_params will not affect the model in any way. You have to use the non-parametric SFH parameters to compute the SFR. See #166

It's hard to optimize a parameter which has no affect on the model SED, but I suspect the actual issue with Levenberg-Markwardt optimization ('lm') is that you have very few photometric points, and many SFH bins. In this case you could either skip the optimization or reduce the number of bins you use.

[Antoine-epfl]

Ok thanks a lot! Sorry for the misundertanding, I will take a look at #166.