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JuliaNLSolvers / NLsolve.jl

Julia solvers for systems of nonlinear equations and mixed complementarity problems

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Strange zeros provided by nlsolve

NormannR opened this issue · comments

commented

Good afternoon,

I am a new user of Julia and experience problems with the function nlsolve.

I installed the package NLsolve this morning through the command Pkg.add("NLsolve"). Its version is 0.13.0 according to the command Pkg.installed().

Following the instructions from the associated github page, I wanted to test the nlsolve function with the following code, but the solution provided by nlsolve is not satisfactory. Indeed, nlsolve gives back 1.0 as a solution of the equation cos(x) = 0

using NLsolve

R = Array{Float64}(1)
function f!(R,x)
	R[1] = cos(x[1])
	return R
end
x0 = Array{Float64}(1)
x0[1] = 0.5
x = nlsolve(f!, x0, show_trace=true)
println("The solution is $(x.zero)")

What am I doing wrong ?

Thanks in advance for your help,

Normann

commented

You have an old version where the syntax was different. Update to 1.0.0

commented

Thank you very much for your quick answer.

I do not get it. I installed for the first time the package this morning. Should not it be the latest version ? I carried out a few commands to ensure that the latest version of the package is installed, but I am unable to get the 1.0.0 version:

julia> Pkg.update()
INFO: Updating METADATA...
INFO: Computing changes...
INFO: No packages to install, update or remove

julia> Pkg.rm("NLsolve")
INFO: Removing DiffBase v0.3.2
INFO: Removing NLsolve v0.13.0
INFO: Package database updated

julia> Pkg.add("NLsolve")
INFO: Installing DiffBase v0.3.2
INFO: Installing NLsolve v0.13.0
INFO: Building SpecialFunctions

How could I get this 1.0.0 version ?

Thanks again for your help

commented

What else do you have installed? Show Pkg.status() and we can help. Sorry for this inconvenience! I will note in the README that it is for v1.0.0 and higher only.

commented

Thank you for your reactivity

Pkg.status() returns the following lines

julia> Pkg.status()
18 required packages:

  • Atom 0.6.8
  • Compat 0.52.0
  • Conda 0.7.1
  • DSGE 0.4.0
  • DataFrames 0.10.1
  • Distributions 0.15.0
  • ExcelReaders 0.8.2
  • ForwardDiff 0.7.3
  • IJulia 1.7.0
  • JuMP 0.18.0
  • LsqFit 0.3.0
  • NLsolve 0.13.0
  • Optim 0.11.0
  • Plots 0.15.0
  • PyCall 1.15.0
  • PyPlot 2.3.2
  • QuantEcon 0.14.1
  • Taro 0.5.0
    106 additional packages:
  • ASTInterpreter2 0.1.1
  • AbstractFFTs 0.2.1
  • AxisAlgorithms 0.2.0
  • BinDeps 0.8.6
  • Blink 0.6.0
  • Blosc 0.3.0
  • BufferedStreams 0.3.3
  • Calculus 0.2.2
  • CodeTools 0.4.7
  • CodecZlib 0.4.2
  • Codecs 0.4.0
  • ColorTypes 0.6.7
  • Colors 0.8.2
  • CommonSubexpressions 0.0.1
  • Contour 0.4.0
  • DSP 0.3.4
  • DataArrays 0.6.2
  • DataStructures 0.7.4
  • DataValues 0.3.1
  • DebuggerFramework 0.1.2
  • DiffBase 0.3.2
  • DiffResults 0.0.3
  • DiffRules 0.0.3
  • Distances 0.5.0
  • DocSeeker 0.1.0
  • DualNumbers 0.3.0
  • FFTW 0.0.4
  • FileIO 0.6.1
  • FixedPointNumbers 0.4.5
  • FredData 0.2.0
  • GZip 0.3.0
  • HDF5 0.8.8
  • Hiccup 0.1.1
  • HttpCommon 0.4.0
  • HttpParser 0.3.0
  • HttpServer 0.3.0
  • Interpolations 0.7.3
  • IterTools 0.2.1
  • IterableTables 0.7.0
  • IteratorInterfaceExtensions 0.0.2
  • JLD 0.8.3
  • JSON 0.16.4
  • JavaCall 0.5.2
  • Juno 0.4.0
  • KernelDensity 0.4.1
  • LNR 0.0.2
  • LaTeXStrings 0.3.0
  • Lazy 0.12.0
  • LegacyStrings 0.3.0
  • LibExpat 0.4.1
  • Libz 0.2.4
  • LightGraphs 0.11.1
  • LineSearches 3.2.5
  • Loess 0.3.0
  • MacroTools 0.4.0
  • MathProgBase 0.7.0
  • MbedTLS 0.5.5
  • Measures 0.1.0
  • Media 0.3.0
  • Missings 0.2.6
  • Mustache 0.3.0
  • Mux 0.2.3
  • NLSolversBase 3.1.0
  • NLopt 0.3.6
  • NaNMath 0.3.1
  • NamedTuples 4.0.0
  • Nullables 0.0.3
  • OptimBase 1.0.0
  • PDMats 0.8.0
  • Parameters 0.8.1
  • PlotThemes 0.2.0
  • PlotUtils 0.4.4
  • Polynomials 0.2.1
  • PositiveFactorizations 0.1.0
  • Primes 0.2.0
  • QuadGK 0.2.0
  • Ratios 0.2.0
  • RecipesBase 0.2.3
  • Reexport 0.1.0
  • Requests 0.5.1
  • Requires 0.4.3
  • ReverseDiffSparse 0.8.1
  • Rmath 0.3.2
  • Roots 0.5.0
  • SHA 0.5.6
  • ShowItLikeYouBuildIt 0.2.0
  • Showoff 0.1.1
  • SimpleTraits 0.5.1
  • SortingAlgorithms 0.2.0
  • SpecialFunctions 0.3.8
  • StatPlots 0.7.0
  • StateSpaceRoutines 0.1.0
  • StaticArrays 0.6.6
  • StatsBase 0.19.5
  • StatsFuns 0.5.0
  • StringDistances 0.2.0
  • TableTraits 0.1.0
  • TableTraitsUtils 0.1.3
  • Tokenize 0.4.2
  • TranscodingStreams 0.4.1
  • URIParser 0.3.0
  • WebSockets 0.4.0
  • WinRPM 0.3.1
  • WinReg 0.2.0
  • WoodburyMatrices 0.2.2
  • ZMQ 0.5.1
commented

Could be DSGE. Did you install that yourself? Also is this JuliaPro or normal Julia?

Edit That is: try to Pkg.rm("DSGE")

commented

I use Julia v0.6.2. A colleague installed it on my computer, with this DSGE module. I do research in macroeconomics and DSGE models are fashionable in this field.

This DSGE module was the guilty party here, indeed ! I uninstalled it and was able to get the 1.0.0 version for NLsolve. Thank very much for your quick and accurate answers ! I would not have found alone with my stammering computer skills...

Wish you the best,

Normann

commented

They are compatible, you just entered the scene at a very unfortunate time where we just upgraded, and DSGE havn't caught up yet! (fellow economist here, hi!)

commented

It is reassuring to know that bad luck played a significant role in this issue. Thank you again !