Scree plot includes too many components

[thomasaarholt]

The scree plot produced from Decomposition Model has no way of limiting the number of components, which makes it difficult to choose the right number. Previously the limit used to be 30 (I think?), but the new code is set to be equal to the number of channels in the signal.

[vidartf]

For reference, the hyperspy change is hyperspy/hyperspy#1359.

Any suggestions for how to solve this best? The simplest approach is of course to hardcode 50 in the UI code to replicate the old behavior.

[jat255]

If I recall, this was chosen because if you used one of the newer PCA methods and limited the number of output components, then the hard coded value would give an error.

Maybe we could do something like "try 50 (or 30 or 40); if exception plot all components"?

On Wed, Apr 5, 2017, 6:49 AM Vidar Tonaas Fauske [email protected] wrote:

For reference, the hyperspy change is hyperspy/hyperspy#1359 https://github.com/hyperspy/hyperspy/pull/1359.

Any suggestions for how to solve this best? The simplest approach is of course to hardcode 50 in the UI code to replicate the old behavior.

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[thomasaarholt]

Hard code it for now, as you can only use the standard PCA algorithm.