I am looking for a tutorial/package for a solver in Julia that is similar to fsolve in Matlab. My problem is mostly that I have a system of equations that I want to find a solution for. My system of equation however takes a vector of variables are given, which need to be included but are not to be s…

NLsolve.jl [image] GitHub - JuliaNLSolvers/NLsolve.jl: Julia solvers for systems of nonlinear... Julia solvers for systems of nonlinear equations and mixed complementarity problems - GitHub - JuliaNLSolvers/NLsolve.jl: Julia solvers for systems of nonlinear equations and mixed complemen…

[image] IljaK91: My system of equation however takes a vector of variables are given, which need to be included but are not to be solved for. This is solved with a closure. If you have a function f(x,p) where p is a parameter you can easily create a new function f2(x) = f2(x, p) which “closes…

For anyone that is interested in a minimal example, although of course you don’t need NLsolve to solve those equations :slight_smile: using NLsolve f! = function (x,dx,a) # we want to find roots for f dx[1] = x[1] - a[1] dx[2] = x[2] - a[2] end a = [1;5] g!(x,dx) = f!(x,dx,a) # g is our closure…

[image] IljaK91: f! = function (x,dx,a) # we want to find roots for f dx[1] = x[1] - a[1] dx[2] = x[2] - a[2] end Never saw this syntax for defining generic functions before. It’s interesting

[image] vvjn: Never saw this syntax for defining generic functions before. It’s interesting It’s not actually a generic function (since you can’t easily define other methods), it’s just an anonymous function bound to a variable.

Note that with NLsolve’s newest version the input should be flipped so that way it’s (dx,x).

Oh yeah that’s true, it’s an anonymous function. Makes more sense, syntax wise. Got confused at first because the output said “(::#1) (generic function with 1 method)”

I should have been more careful: the machinery underlying generic and anonymous functions is the same. The main practical difference is that generic functions give a const binding, which allows you to add more methods, e.g. a regular binding gives: julia> f = x -> x+1 (::#1) (generic function with …

Looking for solvers like Matlab's fsolve for Julia

General Usage

IljaK91 June 6, 2017, 12:08pm 4

Thanks a lot

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Looking for solvers like Matlab's fsolve for Julia

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