Should layout be column major?

[cossio]

The layout option in Plots is row-major. I mean that plot(rand(100,4), layout = (2,2)) places series 1 and 2 on the first row instead of on the first column.

Whereas (for example) reshape(1:4, 2,2) gives 1 and 2 on the first column.

Since Julia arrays are generally column major, it might be worth making layouts column major as well for consistency.

[t-bltg]

IMO, this should be fixed in 2.0 for consistency with the julia ecosystem.

[cossio]

It's a big breaking change

[t-bltg]

Probably, but this is why major releases are for.
If we cannot make a library evolve we are doomed ;)

[cossio]

Yeah ... if it is clearly explained on the Readme / Changelog what needs to be changed in user code it should be fine!

[t-bltg]

Note for the implementation: this behavior should probably depend on a global flag set by default to column major, but with the ability to be toggled to row major if needed.

Arguments in favor:

• julia is column major.

Arguments against:

• we read from left to right.