[GRASS-user] How can I rotate a raster map about a fixed axis

[Qiao Cheng]

Dear all,
    I have a simple artificial raster map created by r.mapcalc command, I want rotating the raster map a finite angle about a fixed axis(for example, the y axis). But I didn't know how to achieve this. Could you give me some suggestions? Which command should I appeal to?
    Thanks in advance.

Best regards

Cheng
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