How to use an external dataset?

Two options

• From ini file with the existing cosmological functions

• Without cosmological functions

From ini file with the existing cosmological functions

If you want to use external data with an existing SimpleMC model, you can set it in the ini file using h, fs8 or distance_mod cosmological functions in the key fn:

[custom]
...

model = LCDM

datasets = generic
path_to_data = path-to-data
path_to_cov = path-to-data-cov
fn = distance_mod
...

Without cosmological functions

In this case, we need to make a Python script instead to use the ini file and combine the simple model independent of any cosmology with new data

m = Parameter("m", 0, 0.05, (0, 0.1), "m_0")
b = Parameter("b", 3, 0.05, (0, 5), "b_0")

# create a list with your parameters objects
parameterlist = [m, b]

my_model = 'm*x+b'

analyzer = DriverMC(model='simple', datasets='generic', analyzername='mcmc',
                    custom_parameters=parameterlist, custom_function=my_model,
                    path_to_data='path-to-data', path_to_cov='path_to_data_cov',
                    fn='generic')

analyzer.executer(nsamp=1000)