Inconsistency in matrixFromFunction when invoked from expression?

[gwhitney]

Suppose I enter matrixFromFunction([3], _(x) = x[1]^2) in the expression parser on the homepage, trying to make a vector of the first three square numbers. It reports a value of [0, 1, 4], which seems inconsistent: from the perspective of the mathjs expression language, the three indices of that return matrix are [1], [2], and [3]. So from that point of view, this expression "should have" returned [1, 4, 9]. (Because in the expression language, matrix indices are 1-based instead of 0-based).

Should mathjs be modified so that when matrixFromFunction is invoked via the parser, it calls the callback with 1-based indices rather than 0-based indices?

I personally think so, for internal self-consistency, but ultimately Jos will have to decide if this consistency is worth the effort it will be.

[gwhitney]

Ah and note the matrixFromFunction behavior is directly contradictory to map called from the expression language: map([0,0,0], _(x,i) = i[1]^2) evaluates to [1, 4, 9]. This behavior for map was explicitly implemented in v0.26. Thus, it seems to me that the current behavior of matrixFromFunction in the expression language is simply a bug. Please confirm by creating an issue from this discussion, thanks.