Visualization

Authors

John Weaver <john.weaver.astro@gmail.com>

About

Visulization tools to examine output from pca_projection routines.

Regions are defined from the SDSS/MaNGA MPL-6 sample by K. Rowlands (priv. comm.)

Known Issues

None

pygappy.visualization.get_patches_highmass()[source]

Patches for PCA-defined regions calibrated with MPL-6. Suitable for low-z, with Log10(M*) > 10.

Parameters:None –
Returns:pca_patches_highmass – Series of patches for high-mass objects.
Return type:ndarray
pygappy.visualization.get_patches_lowmass()[source]

Patches for PCA-defined regions calibrated with MPL-6. Suitable for low-z, with Log10(M*) < 10.

Parameters:None –
Returns:pca_patches_lowmass – Series of patches for low-mass objects.
Return type:ndarray
pygappy.visualization.model(data, wave, pcs, espec, error=None, mean=None, norm=1.0, nshow=3, show_labels=True, ax=None, normalize=False)[source]

Plots the output model fit of a PCA analysis.

Parameters:
  • data (ndarray) – 1D spectrum with ‘float’ type.
  • wave (ndarray) – 1D array of wavelengths.
  • pcs (ndarray) – 1D array of principal components.
  • espec (ndarray) – 2D array of eiegenspectra.
  • error (ndarray, optional) – 1D error spectrum. Required for windows to work.
  • mean (float, optional) – 1D mean spectrum, required for normgappy pcs.
  • norm (float, optional) – Normalization constant, required for normgappy pcs.
  • nshow (float, optional) – Number of eigenspectra to plot. Default is ‘3’.
  • show_labels (bool, optional) – Turns on/off default x/y labels. Default is ‘True’.
  • normalize (bool, optional) – Turns on/off scaling normalization using norm. Default is ‘False’.
  • ax (:obj:axes, optional) – Existing ax object to draw on. Default is ‘None’
Returns:

  • ax (axes-object) – Axes containing the model plot.
  • fig (figure-object, optional) – If enabled, figure containing the axes.
pygappy.visualization.pc_plane(logmass=1.0, ax=None, monochromatic=False)[source]

Returns an ax object with PC1/2 plane patches.

Parameters:
  • logmass (float, optional) – Log10 stellar mass, used to select suitable region patches. Default is ‘1.’, for low-mass.
  • ax (axes-object, optional) – Existing axes object to populate. Default is ‘None’.
  • monochromatic (bool, optional) – If enabled, only shows region boundaries, not colors. Default is ‘False’.
Returns:

  • ax (axes-object) – Axes containing the model plot.
  • fig (figure-object, optional) – If enabled, figure containing the axes.