I have a row by col matrix called “stock” and I have a col array called “flow”. I want to add the content of flow to the bottom of stock. I thought the following would work, but it does not:
stock = [stock;flow[1,:]]
My background is MATLAB, so I thought I could fix the issue using
stock = [stock;flow[1,:]']
But that didn’t work either.
What is the way to get the job done?
A MWE could help. As this works:
julia> a = rand(3,3); b = rand(3,3)
3×3 Array{Float64,2}:
0.985678 0.725839 0.162454
0.235461 0.789938 0.304215
0.303247 0.792388 0.332765
julia> [a;b[1,:]']
4×3 Array{Float64,2}:
0.196151 0.294524 0.332187
0.615515 0.0402781 0.0076374
0.330384 0.841746 0.0751668
0.985678 0.725839 0.162454
The mistake is mine. I will request to delete the question and post it with better information. It turns out I am not working wit a matrix but a 18×12 Array{Any,2}…
It is worth noting that concatenating matrices like this makes a copy, and thus is not a good idea for large amounts of data, or in performance sensitive inner loops. If you are concatenating vectors to a matrix many times in a loop, using an Array-of-Arrays is sometimes a better option.