版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/mifangdebaise/article/details/84998819
Julia 符号计算 SymEngine.jl
给一个自己有用的例子
julia> using SymEngine
julia> W = [symbols("W_$i$j") for i in 1:3, j in 1:4]
3×4 Array{Basic,2}:
W_11 W_12 W_13 W_14
W_21 W_22 W_23 W_24
W_31 W_32 W_33 W_34
julia> typeof(W[1,2])
Basic
julia> W_11 = symbols(:W_11)
W_11
julia> @. diff(W,W_11)
3×4 Array{Basic,2}:
1 0 0 0
0 0 0 0
0 0 0 0