[R] image.plot transparent?

[Chris82]

Hi R users,

I have a maybe strange problem.

Normaly I do image.plot() with x,y coordinates and add=T and if I have some
NA values in my data matrix z, the color will be transparent of these
pixels.

But now I have a disorted coordinate system and x,y are a matrix. It works
also fine, but now NA values are white colored and not transparent anymore.

It is problematic if I have a secondary information underlying.

Is there any solution for this stuff?

Thanks!

best regards

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