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After reading up on processing algorithms I see there is not an option to have a "selected features" checkbox. It states in the documentation:

Algorithms follow the following simple rules when using a vector layer.

If the layer has a selection, only selected features are used.
If there is no selection, all features are used.

However, when I run a process such as 'Random selection' from the Processing Toolbox all items (in my case all points), are processed, not just the features I have selected. I have gone into the Processing - Options - General menu and have selected/deselected 'Use only selected features' but no success?

Am I not proceeding correctly or is/was there a bug in v2.18?

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    Why QGIS 2.18 ?!
    – Taras
    May 16 '20 at 20:57
  • I believe I have found the answer by using Random Extract within Subset instead of Random Selection.
    – Clutch
    May 17 '20 at 17:06

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