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I am using the raster calculator in QGIS 2.18.11, and I want to find the equation/input that went in the "raster calculator expression" box for rasters that have already been created with the raster calculator.

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Unfortunately QGIS 2.18 Raster calculator does not keep history of expressions or input parameters.

However, if we run Raster calculator in QGIS 3.0 from Processing Toolbox | QGIS Raster analysis, there is a Log window (available until we close the session).

We can also Save our own expressions for future use.

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