# Differential Equations and Parameter Estimation

**URL:** <https://discourse.julialang.org/t/differential-equations-and-parameter-estimation/24246>\
**Category:** General Usage\
**Created:** [May 15, 2019, 4:52pm UTC](https://discourse.julialang.org/t/differential-equations-and-parameter-estimation/24246 "2019-05-15T16:52:09Z")\
**Posts on this page:** 1\
**Showing post:** 17

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**Author:** ![BLI](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/bli/32/37206_2.png) [@BLI](https://discourse.julialang.org/u/BLI)\
**Post date:** [June 18, 2019, 7:02am UTC](https://discourse.julialang.org/t/differential-equations-and-parameter-estimation/24246/17 "2019-06-18T07:02:32Z")

</div>

![image](https://global.discourse-cdn.com/julialang/original/3X/7/7/773bc649f6e7f722a00a976797a16ffa5a641d21.png)

Here is the result from ProfileView in IJulia. From the user description at ProfileView.jl, I thought that I could hover the mouse over the various areas and get some more insight, but hovering doesn’t help… (Btw: I needed to increase the resolution from the default 10^6…).

How can I use this profile view?

NOTE: when `using ProfileView`, I’m told that:

```julia
julia> using ProfileView
[Info: Precompiling Gtk [4c0ca9eb-093a-5379-98c5-f87ac0bbbf44]
ERROR: LoadError: Cairo not properly installed. Please run
Pkg.build("Cairo")

```

If I run `Pkg.build("Cairo")`, I get error messages:

```julia
julia> Pkg.build("Cairo")
  Building LibCURL ─→ `C:\Users\user_name\.julia\packages\LibCURL\teHPG\deps\build.log`
  Building WinRPM ──→ `C:\Users\user_name\.julia\packages\WinRPM\Y9QdZ\deps\build.log`
  Building Homebrew → `C:\Users\user_name\.julia\packages\Homebrew\s09IX\deps\build.log`
  Building Cairo ───→ `C:\Users\user_name\.julia\packages\Cairo\p68X8\deps\build.log`
┌ Error: Error building `Cairo`:
│ [ Info: Updating WinRPM package list
│ [ Info: Downloading https://cache.julialang.org/http://download.opensuse.org/repositories/windows:/mingw:/win32/openSUSE_Leap_42.2/repodata/repomd.xml
│ [ Info: Downloading https://cache.julialang.org/http://download.opensuse.org/repositories/windows:/mingw:/win64/openSUSE_Leap_42.2/repodata/repomd.xml
│ [ Info: Nothing to do
│ [ Info: Nothing to do
│ ERROR: LoadError: Provider WinRPM.RPM failed to satisfy dependency pango
│ Stacktrace:
│ [1] error(::String) at .\error.jl:33
│ [2] satisfy!(::BinDeps.LibraryDependency, ::Array{DataType,1}) at C:\Users\user_name\.julia\packages\BinDeps\ZEval\src\dependencies.jl:945
│ [3] satisfy!(::BinDeps.LibraryGroup, ::Array{DataType,1}) at C:\Users\user_name\.julia\packages\BinDeps\ZEval\src\dependencies.jl:910
│ [4] satisfy!(::BinDeps.LibraryGroup) at C:\Users\user_name\.julia\packages\BinDeps\ZEval\src\dependencies.jl:874
│ [5] top-level scope at C:\Users\user_name\.julia\packages\BinDeps\ZEval\src\dependencies.jl:977
│ [6] include at .\boot.jl:326 [inlined]
│ [7] include_relative(::Module, ::String) at .\loading.jl:1038
│ [8] include(::Module, ::String) at .\sysimg.jl:29
│ [9] include(::String) at .\client.jl:403
│ [10] top-level scope at none:0
│ in expression starting at C:\Users\user_name\.julia\packages\Cairo\p68X8\deps\build.jl:176
└ @ Pkg.Operations C:\cygwin\home\Administrator\buildbot\worker\package_win64\build\usr\share\julia\stdlib\v1.1\Pkg\src\Operations.jl:1075

```

I don’t know if these error messages are related to those at [Problem with Cairo building - #10 by tobias.knopp](https://discourse.julialang.org/t/problem-with-cairo-building/23600/10) (which seems to be for a Linux installation). The ProfileView version is ` [c46f51b8] ProfileView v0.4.1`.

Anyway, I’ll transfer the commands from IJulia to Juno, and try without using ProfileView.

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_[View the full topic](https://discourse.julialang.org/t/differential-equations-and-parameter-estimation/24246)._