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QGIS raster calculator is confusing me and I have no idea how to perform a very simple task.

I have 2 rasters, A and B:

Raster A has 9999 values on all pixels. Raster B has different values including no data pixels.

I want Raster A pixel to = Raster B pixel where B != null

Which means Raster C(output) is 9999 Except where Raster B has values

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The QGIS-documentation provides a very similar example-task: https://docs.qgis.org/3.4/en/docs/user_manual/working_with_raster/raster_calculator.html

According to the documentation, the following should work:

("slope_clipped@1" > 0) * "slope_clipped@1" + ("slope_clipped@1" = 0) * 9999

Naturally, if you didn't describe your data correctly to us, this wont work.

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