A symmetric matrix and a lower triangular matrix are different things. Look for what you want here: http://julia.readthedocs.io/en/latest/manual/linear-algebra/ and here: http://julia.readthedocs.io/en/latest/stdlib/linalg/
On Fri, Aug 19, 2016 at 4:07 PM, Ahmed Mazari <[email protected]> wrote: > 4×4 Array{Int64,2}: > 0 1 2 3 > 1 0 4 5 > 2 4 0 6 > 3 5 6 0 > > a symetric matrix m[i,j] =m[j,i] and m[i,i]= 0 > > On Fri, Aug 19, 2016 at 3:59 PM, Jeffrey Sarnoff < > [email protected]> wrote: > >> Is this what you want, or are you looking for a more general way to >> construct nxn matrices like this 4x4 matrix, or something else? >> >> julia> m = [ [0,1,2,3] [1,0,4,5] [2,3,0,6] [4,5,6,0] ] >> 4×4 Array{Int64,2}: >> 0 1 2 4 >> 1 0 3 5 >> 2 4 0 6 >> 3 5 6 0 >> >> >> On Friday, August 19, 2016 at 9:01:06 AM UTC-4, Ahmed Mazari wrote: >>> >>> Yes but it doesn't allow me to set the diagonal to 0 ?? >>> >>> On Fri, Aug 19, 2016 at 2:55 PM, Michael Borregaard <[email protected] >>> > wrote: >>> >>>> You can build the matrix as normal, then specify that the upper >>>> triangle is undefined by >>>> mat = LowerTriangular(mat) # where mat is a Matrix of any eltype. >>>> >>> >>> >
