Writing x'x does not explicitly transpose the first vector. Julia is clever enough to call dot behind the scenes when you write x'x.
2014-05-21 3:09 GMT+02:00 Blake Johnson <[email protected]>: > In Julia, [1.0 1.0] is a 1x2 Array. If you insert commas you get a > 2-element vector and then dot works, i.e. > dot([1.0, 1.0], [1.0, 1.0]) > > > On Tuesday, May 20, 2014 8:25:01 PM UTC-4, Altieres Del-Sent wrote: >> >> I am used to write at matlab dot([1 1], [1 1]). I know I can use [1 1]' >> *[1 1] to calc the dot product, but I use that way because I think is >> faster without ask to transpose, I tried do the samething with julia and >> get dot([1.0 1.0],[1.0 1.0]) >> >> MethodError(dot,( >> >> 1x2 Array{Float64,2}: >> >> 1.0 1.0, >> >> >> 1x2 Array{Float64,2}: >> >> 1.0 1.0)) >> >> why? >> >> -- Med venlig hilsen Andreas Noack Jensen
