Basic Output Example

Imagine we want to explore the function scipy.special.eval_jacobi. It takes four different arguments and we want to get a feel for what each does.

First we wrap it in a Runner object, that encapsulates how to run all the different combinations of its arguments and automatically labels the output.

from xyzpy import *
from scipy.special import eval_jacobi

def jacobi(x, n, alpha, beta):
     return eval_jacobi(n, alpha, beta, x)

r = Runner(jacobi, var_names='Pn(x)')

This is as simple as it gets, the function jacobi has one output variable, which we are calling 'Pn(x)'.

Now let’s define all the different values we want to try for each argument (the function actually vectorizes over x so this is overkill, but serves as a good demonstration):

import numpy as np

combos = {
    'x': np.linspace(0, 1, 101),
    'n': [1, 2, 4, 8, 16],
    'alpha': np.linspace(0, 2, 3),
    'beta': np.linspace(0, 1, 5),
}

Now, let’s run the function for every combination of the above parameters:

r.run_combos(combos)

100%|##########| 7575/7575 [00:00<00:00, 168145.97it/s]

<xarray.Dataset>
Dimensions:  (alpha: 3, beta: 5, n: 5, x: 101)
Coordinates:
  * x        (x) float64 0.0 0.01 0.02 0.03 0.04 ... 0.96 0.97 0.98 0.99 1.0
  * n        (n) int64 1 2 4 8 16
  * alpha    (alpha) float64 0.0 1.0 2.0
  * beta     (beta) float64 0.0 0.25 0.5 0.75 1.0
Data variables:
    Pn(x)    (x, n, alpha, beta) float64 0.0 -0.125 -0.25 ... 153.0 153.0 153.0

The resulting dataset is stored in r.last_ds and is an automatically labelled n-dimensional xarray.Dataset. Let’s interactively plot what we have, showing the effect of all four dimensions:

r.last_ds.xyz.ilineplot(
    x='x', y='Pn(x)', z='beta', col='n', row='alpha', ylims=(-2, 2),
    colors=True, colormap='rainbow_r', colorbar=True,
)

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