Questions tagged [julia]
The Julia programming language is fast, expressive and dynamic. By aggressively targeting technical computing it has become a robust general purpose language. It addresses the two-language problem by combining the ease of use of high-level languages such as R and Python with the performance of C and Fortran.
julia
12,731
questions
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DifferentialEquations.jl - Spring mass damper system ODE
Is this the right way to write a spring mass damper system in julia using DifferentialEquations.jl?
function smd(du, u, p, t)
c, k, m = p
du[1] = dx = u[2]
du[2] = dv = -(c/m)*u[2] - (k/m)*...
- 16.7k
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votes
1
answer
18
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Strange linking problem when `dlopen` a library
I have some strange linking problem with a library which is dynamically loaded using dlopen.
Precisely, I have a code that loads a library libmine.so (which is part of the code) that depends on Intel ...
- 831
1
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0
answers
27
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Julia MixedModel in R: how to write a formula without an intercept?
TL/DR: is there a way to develop a formula without an intercept for a GeneralizedLinearMixedModel?
I have a very peculiar modeling problem that requires a GLMM model statement without a fixed ...
- 21
1
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0
answers
38
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+50
Negative exponent in plot in Julia
I have data with very small values
A =[1.1222557035765826e-7, 2.651246968143401e-7, 1.7965534845544633e-7, 6.726776330241659e-7, 1.3723877581050262e-7, 2.392303846597451e-7, 1.7973640211865906e-7, 6....
- 105
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0
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20
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custom linear interpolation in julia
I'm trying to make the following algorithm more concise:
function tri_linear_interpolation(nx::Int, x::Vector{Float64}, ny::Int, y::Vector{Float64}, nz::Int, z::Vector{Float64}, f::Array{Float64, 3}, ...
1
vote
1
answer
43
views
Is there a way to rename the bands of a Raster in Rasters.jl?
This is the Raster I am using:
30097×19617×4 Raster{UInt8,3} │
├───────────────────────────────┴────────────────────────────────────────────────────────────────────────────────────────────── dims ┐
...
1
vote
1
answer
30
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Getting MethodError: no method matching *(::Vector{Float64}, ::Vector{Float64}) on julia FractionalDiffEq
used the FractionalDiffEq package correctly below as said in the documentation text
but kept on getting the error above.
P.S: I am running the code in google colabs
using FractionalDiffEq
function ...
0
votes
0
answers
29
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ways for storing and organizing constants in julia [closed]
I’m new to julia and kind of new to programming. I’m writing a simulation in Julia that uses a lot of constants, many of which will be called millions of times. I’m wondering about the best way to ...
0
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0
answers
25
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Too much whitespace in my Julia gif (using Plots.jl)
I'm using Plots.jl to create some animation but the resulting .gif file has too much white space surrounding it.
For example, I took the Lorenz Attractor example directly from the documentation and ...
- 351
0
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1
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45
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Julia: Easiest and efficient way to check if each element of a vector is in another list? .∈ doesn't seem to work
In Julia, assuming I have a vector and a list of candidates:
x = [1, 2, 3, 4, 5]
targetlist = [1, 2]
I would like to iteratively check for each element of the vector if it is contained in the target ...
- 1,623
0
votes
0
answers
23
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Integration using BigFloat in Julia
I have a problem with understanding how calculation with BigFloat works in Julia. I want to calculate an integral using the DoubleExponentialFormulas QuadDE function.
I thought this part would work:
...
1
vote
1
answer
37
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Wrong function call when solving for steady state using julia's NonlinearSolve
I am using NonlinearSolve to solve a steady state problem. When I do
prob = SteadyStateProblem(eoms!, σ₀, p)
sol = solve(
prob,
SSRootfind(),
abstol = slv.abstol,
reltol = slv.reltol,
)...
- 47
1
vote
2
answers
55
views
Most efficient way to access the off-diagonal entries of a matrix in Julia
Suppose I have a 200 x 200 zero matrix in Julia. What is the most efficient way to set the off-diagonal elements of the matrix using the elements of another matrix?
I have written this code:
function (...
- 149
0
votes
0
answers
28
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Read a S2P file with Julia
I'd like to read a S2P file (containing a frequency response) with Julia.
What is the best way to do it? Is there an equivalent of "scikit-rf" (Python) in Julia?
I saw: SParameters and ...
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0
answers
27
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Julia - Quickly import method from package in module
In Julia, I want to use the Optimizer method from Gurobi in a module which I then use in a Julia script. Importing this method (either with the line using Gurobi: Optimizer or import Gurobi: Optimizer)...
- 13