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I am using QGIS 2.8.1 to build a model. All is working fine until the raster calculator input. I understand that the raster calculator in QGIS Modeller is a SAGA tool. With this, I have tried both the following formulae:

g1-g2

a-b

I keep on getting an error message, am I typing in the formula completely wrong?

All I want to do is take away one raster layer from the other, giving me a new raster output.

closed as off-topic by PolyGeo Jun 27 '16 at 21:21

This question appears to be off-topic. The users who voted to close gave this specific reason:

  • "This problem cannot or can no longer be reproduced. Changes to the system or to the asker's circumstances may have rendered the question obsolete, or the question does not include a procedure to enable potential answerers to reproduce the same symptoms. Such questions are off-topic as they are unlikely to help future readers, but editing them to include more details can lead to re-opening." – PolyGeo
If this question can be reworded to fit the rules in the help center, please edit the question.

  • 1
    What is the error message you get when the SAGA part starts? – Moreau Colin Jun 27 '16 at 14:03
2

After trying several attempts the following successfully worked:

(a-b)

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