And (maybe) the most important question:
For which reason the square of an Array{AbstractFloat,1} is Array{Any,1}
instead of Array{AbstractFloat,1}?
julia> typeof(f)
Array{AbstractFloat,1}
julia> typeof(f.^2)
Array{Any,1}
thanks,
Charles
On 4 January 2016 at 13:47, Charles Novaes de Santana <
[email protected]> wrote:
> Hi people,
>
> I would like to work with matrices represented as Arrays of Arrays of
> AbstractFloats. Something like this:
>
> F=Array{AbstractFloat}[];#initialize the matrix F as an Array of
> Arrays of Float
> for (i in 1:10)
> Fi = Array(AbstractFloat,0);#initialize the vector Fi as an
> Array of Float
> for (k in 1:5)
> push!(Fi,k^2+i^2)
> end#end-fork
> push!(F,Fi);
> end#end-fori
>
> typeof(F)
> Array{Array{AbstractFloat,N},1}
>
> But I am experiencing problems to work with rows/columns of such Arrays. I
> would like to calculate the logarithm of the square of elements of those
> rows/columns like this:
>
> f = F[1];#a vector of AbstractFloat
>
> typeof(f)
> Array{AbstractFloat,1}
>
> typeof(f.^2)
> Array{Any,1}
>
> log(f.^2)
> ERROR: MethodError: `log` has no method matching
> log(::Array{Any,1})
>
>
> I understand this error only happens because I am working with Arrays of
> Arrays of AbstractFloats. If I run a similar code using a Matrix instead of
> Array I don't have such problems:
>
> A = rand(10,5);#a matrix of floats (similar to an array of arrays)
>
> typeof(A)
> Array{Float64,2}
>
> a = A[1,:];#a vector of Float
>
> typeof(a)
> Array{Float64,2}
>
> typeof(a.^2)
> Array{Float64,2}
>
> log(a.^2)
>
>
> everything runs smoothly.
>
> My question: Am I doing something wrong in the way I am dealing with the
> Array of Arrays of AbstractFloat? Should I convert it to a Matrix? Or
> should I convert its elements to Array of Float instead of Array of Any?
> Any other suggestion?
>
> Thanks for your attention and for any advice!
>
> Charles
>
> --
> Um axé! :)
>
> --
> Charles Novaes de Santana, PhD
> http://www.imedea.uib-csic.es/~charles
>
--
Um axé! :)
--
Charles Novaes de Santana, PhD
http://www.imedea.uib-csic.es/~charles
