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Trending Discussions on Lagrange
QUESTION
I have this code that shows the Lagrange interpolation between set of points(x,y cordination). Using matplotlib:
...ANSWER
Answered 2021-May-05 at 11:17Break markers into new lines
import numpy as np from scipy.interpolate import lagrange import matplotlib.pyplot as plt
QUESTION
following are my files for html, .ts and json . As json data was very extensive therefore i have just added a few states and their cities. my 1st dropdown is showing all states. Now I want to match my 1st dropdown's selected value of state with a key "state" in "cities" object in my json file so i can populate 2nd dropdown with cities relevant to that state. and I want to do this in function "getCitiesForSelectedState". please help me find solution for this.
//.ts file
...ANSWER
Answered 2021-Apr-27 at 16:44You can do it with the $event
parameter.
Make sure to compare your values safely.
If your value is not in the right type or has spaces or unwanted chars, this c.state == val
might not work.
You can use the trim
function to compare your value safely:
c.state.trim() == val.trim()
HTML
QUESTION
I'd like to know how it's possible to obtain the lagrange multipliers from an optimal solution in a Concrete model solved with glpk?
Thanks!
...ANSWER
Answered 2021-Apr-08 at 19:59This works for me in gurobi
, try it out and tell me if it works with glpk
.
You need to prompt getting the Lagrange multipliers / dual variable in pyomo by putting the following line somewhere before solving your model:
QUESTION
hello people (I am new to python) Question: i use ipywidgets with buttons, i want to call a list of function, sometimes there's a problem in a function (syntax, division by zero,...), i try to put an exception to pass the error and lunch the next function, don't work :(
I'm running in jupyter environment using python 3.8.5.final.0 and pandas 1.1.3 division by 0 problem of syntax
...ANSWER
Answered 2021-Mar-30 at 19:42You're calling your functions at the wrong time. In
QUESTION
I have a pyomo model "m" with 4 variables and several constraints (both equality and inequality) in the form:
Min F(G1,G2,D1,D2) st h=0 g<=0
Then I need to build the lagrangian function, which is something like this:
Briefly, lambda and mu are the duals of the constraints. So I need the objective function + dual1cons1 + dual2cons2 and so on.
I have literally no idea how to do this. The closest I got is with this:
...ANSWER
Answered 2021-Jan-08 at 22:52Pyomo constraints have a body
attribute, and uslack
and lslack
functions that give you a sum expression of the constraint left hand side, the upper slack, and lower slack respectively. The `body attribute is what you want to multiply by lambda and mu. Here is an example with a simple constraint
QUESTION
I am currently experimenting with polynomial fitting using jupyter. The function below returns the least-square polynomial of degree m given the data points in xs with corresponding ys.
...ANSWER
Answered 2020-Nov-06 at 17:31Your code appears correct; you re-discovered the issues with trying to invert nearly-singular matrices with finite-precision arithmetic. The matrix A looks like this
QUESTION
I have a subroutine finding the address of a cell containing a specific string. I am capturing the address of this cell as a variable x
and then I want to select that cell. What I have thus far is:
ANSWER
Answered 2020-Oct-05 at 20:52I think you're being tripped up by using a SUB
to set a variable value. A Function
is the proper method to your issue.
QUESTION
I implement a Sequential quadratic programming (SQP) optimizer and use ojAlgo for the quadratic programming (QP) subproblem.
My question is: How do I get hold of the "Lagrange multipliers" for the QP solution?
In the attached example code that solve an QP result.getMultipliers() only return an empty Optional.
...ANSWER
Answered 2020-Sep-18 at 09:09I believe that is an Optional
because it was (sometimes) too messy to map the Lagrange multipliers from the solver to the constraints of the model.
If you're implementing an SQP solver may I suggest that you don't implement it in terms of ExpressionsBasedModel
, but delegate to the convex solvers directly. Build something that implements org.ojalgo.optimisation.Optimisation.Solver
and delegate to the various classes in the org.ojalgo.optimisation.convex
package. Then you code more directly with the matrices, vectors and multipliers.
To make that solver usable by ExpressionsBasedModel
you also implement an org.ojalgo.optimisation.Optimisation.Integration
and register that by calling ExpressionsBasedModel.addPreferredSolver(myIntegeration)
or ExpressionsBasedModel.addFallbackSolver(myIntegeration)
.
Implementing a solver and making it usable from the modelling tool are two separate things.
QUESTION
Im trying to plot the orbit of jupiter around the sun (as well as 2 astroid clusters in the Lagrange points) using integrate.solve_ivp, but when i plot a graph of x position and y, I'm getting a spiral, rather than a stable orbit. Can anyone help?
...ANSWER
Answered 2020-Aug-23 at 14:34These are typical symptoms of a wrong numerical method or wrong parameters to the method.
Reading the documentation, you can use several methods. For the default "RK45"
I got what you described. However, using
QUESTION
How do I set starting guess for dual variable in cvxpy? for a normal single value problem the solution is
...ANSWER
Answered 2020-Aug-20 at 15:32CVXPY does not currently support starting guesses, neither for primal or dual variables.
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