How do I change the start location of a pixel matrix?

[tomas041857]

I am building a P5 panel matrix. I know that the start location of the 1st pixel is the lower left corner of the matrix. I was wondering if the start location can be change to the upper right or left corner of the matrix. Thanks for any help. Tomas041857

[dkulp]

Actually, the default is the upper left.  The two options are upper left and bottom left.