Surface plot interprets dims 1 and 2 of a matrix to be y and x (should be reversed)

For example:

plot_ly(z = ~volcano, type = "surface")

Obviously, the 1st dimension of matrix volcano is interpreted as the 'y', while the 2nd dimension as the 'x'.

However, a more natural order is: 1st dimension of matrix to be 'x', while the 2nd dimension to be 'y'. Such interpretation is in other R packages such as MASS: the function kde2d() will returns x, y and z matrix, where the dim1 and 2 of z is x and y respectively.

plot_ly(z = ~volcano, type = "surface") の例から始め、サーフェスプロットで行列の次元がどのようにマッピングされるかを追跡します。この規約を MASS::kde2d() と比較し、レンダリングされたサーフェスでは行列の第 1 次元が x に、第 2 次元が y にマッピングされることを確認します。