ojAlgo | oj! Algorithms | Learning library
kandi X-RAY | ojAlgo Summary
kandi X-RAY | ojAlgo Summary
oj! Algorithms
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Top functions reviewed by kandi - BETA
- Builds the Simplex table
- Construct a simplexTable from a LinearSketch builder
- Creates a new Expression that fixes the fixed values of this expression
- Calculate a mix of weights
- Performs the optimisation
- Scans the entities
- Raster reduction
- Computes the transform
- Encrypts a 4 - column constraint
- Parses the input line
- Assigns a 4 x4 triple
- Fill 4 column 4
- Fills the matrix
- Fill a 4 - bit region
- Copies the experimental constraint from the source model to the destination model
- Returns true if the two sets are lower bounds
- Fills a matrix
- Copies the given source model to the given constraint builder
- Creates a full 64 - bit feature table
- Fills a solution
- Performs symmetric reduction on a matrix
- Fills a 4 matrix
- Assigns a full 4 x5 feature
- Performs a 2 x5 matrix
ojAlgo Key Features
ojAlgo Examples and Code Snippets
Community Discussions
Trending Discussions on ojAlgo
QUESTION
I use ojAlgo to solve a system of linear equations. In one case I get a RecoverableCondition exception. Probably because matrix is ill-conditioned, the condition number is about 1e15.
I use ojAlgo to solve it as seen in the code below. It usually works, but not in this case.
Is there any other solver I could use for a symmetric indefinite (ill-conditioned) matrix?
The present failing size is 18x18 but later 1000x1000 might be needed. Since its part of a iterative algorithm the accuracy is not super important.
...ANSWER
Answered 2021-Oct-14 at 14:36In your case, that method would use a Cholesky decomposition as the solver.
If here's a problem then try to pick another decomposition by instantiating a suitable alternative directly. An SVD can usually handle anything, but that would be very expensive. Perhaps QR can be ok.
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
I'm working on a image classification library, in 100% Java. It does not include deep neural networks. It uses Fisherfaces by OjAlgo. jFaces works very similar to regular machine learning software. Train model and validate it. I want to serialize the model and the model contains only objects of Primitive64Matrix
https://github.com/DanielMartensson/jFaces
How can I serialize Primitive64Matrix in OjAlgo?
I have my class
...ANSWER
Answered 2020-May-21 at 18:10In Java only objects that implement the Serializable interface are serializable...
ojAlgo classes rarely implements Serializable nor is there a defined matrix file format or similar.
You have to build something yourself.
QUESTION
Trying to solve generalized eigenvalues on the form:
...ANSWER
Answered 2020-May-17 at 20:35In the first code example you call:
QUESTION
I'm trying to take square root on all elements in a matrix A by doing the following command.
ANSWER
Answered 2020-May-17 at 20:01UnaryFunction modifier = PrimitiveMath.ROOT.parameter(2);
// To modify A in place
A.modifyAll(modifier);
// The results in another matrix
A.operateOnAll(modifier).supplyTo(B);
// To have a new results matrix created for you
MatrixStore C = A.operateOnAll(modifier).get();
// If A if of an immutable type like Primitive64Matrix
DenseReceiver mutable = A.copy();
mutable.modifyAll(modifier);
Primitive64Matrix B = mutable.get();
QUESTION
Is it possible to insert a Access2D element in a Primitive64Store in OjAlgo?
...ANSWER
Answered 2020-May-17 at 10:41Perhaps something like this:
QUESTION
When computing the eigenvalues with OjAlgo. Are the eigenvalues always on a descended order?
...ANSWER
Answered 2020-May-17 at 10:39Right from the documentation for Eigenvalue#isOrdered:
The eigenvalues in D (and the eigenvectors in V) are not necessarily ordered. This is a property of the algorithm/implementation, not the data.
QUESTION
I have an matrix
...ANSWER
Answered 2020-May-17 at 07:55I found the answer!
Community Discussions, Code Snippets contain sources that include Stack Exchange Network
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Install ojAlgo
You can use ojAlgo like any standard Java library. Please include the the jar files in your classpath. You can also use any IDE and you can run and debug the ojAlgo component as you would do with any other Java program. Best practice is to use a build tool that supports dependency management such as Maven or Gradle. For Maven installation, please refer maven.apache.org. For Gradle installation, please refer gradle.org .
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