RossBoylan

Same problem after updating to the latest Julia 0.4 code. ``` | | |_| | | | (_| | | Version 0.4.7-pre+1 (2016-06-19 17:17 UTC) _/ |\__'_|_|_|\__'_| | Commit 57d0834...

``` julia> h11=copy(h10) 10x10 Array{Float64,2}: julia> Base.LinAlg.copytri!(h11, 'U') 10x10 Array{Float64,2}: julia> issym(h11) true julia> issym(h10) false ``` So the result of `copytri!` is symmetric. This suggests the problem is elsewhere,...

Using Debug and StackTraces (is there a better way?) I think I may see the problem. The call seems to be routed to the evaluation of the Jacobian of the...

``` # in test/derivative.jl # PR 91 f6(x) = sin(x[1]^2+3x[2]^4) @test issym(Calculus.hessian(f6, [1.0, 2.0])) ``` Moving on to solutions... Interestingly, the f5 function that is there now passes the test.

The value for the second derivative of the second argument is not very accurate. The hessian in the above test computes a value of 8832.66, but the true value is...

The answer to my last question appears to be No--the sample code will visit the same commits repeatedly. However, by keeping a list heads (actually, their associated id) that were...

Would it be better to implement the `Dict` protocol (I'm not entirely sure how to discover what that is; it doesn't seem to be explicitly documented in https://docs.julialang.org/en/v1/base/collections/#Base.Dict), e.g., `keys`...

Thank you for your detailed response. I haven't fully processed it, but I can tell you some more about why I am digging into this. I want to implement an...

Thanks for the pointer; [RegressionFormula.jl](https://github.com/kleinschmidt/RegressionFormulae.jl) looks like just what I need. At least until things get more complicated. I'm still not following all the details, but perhaps the docs could...

I am not very familiar with vim and so am not in the best position to judge. I couldn't even find vim documentation about why the current recommended setup works!...