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nlmixr2est events for loggers6 hours ago
The event bus in brief | Events emitted by nlmixr2est | fitComplete | solveComplete | fitUpdate | The call field | What is not emitted | Listening | Full logging | For developers: nlmixrUpdateObject()
lbfgsb3c: Using the 2011 version of L-BFGS-B.8 days ago
Abstract | Provenance of the R optim::L-BFGS-B and related solvers | Functions in package lbfgsb3c | Candlestick function | Extended Rosenbrock function (from funconstrain) | Using compiled function code | References
Automatic model diagrams21 days ago
A first diagram | Drawing engines | The graph behind the diagram | How the equations are read | Pharmacodynamic models | Target-mediated drug disposition | Dosing compartments | Dosing properties and delays | linCmt() models | Limitations
Inside nlmixr2nn23 days ago
The shape of it | Parse time: where the weights come from | Getting a value out of a UDF | The weight-block offset: the sharpest edge here | Cotangent capture | Which score is used, and why | Model augmentation | The training backend | Persistence | Things that look safe and are not | The weight penalty | Lambda is a fraction, not an amount | Extending | Where to look when something is wrong
Neural networks in nlmixr2 models23 days ago
What nn() is | Simulating a model you have not fitted | Learning a term you do not know (UDE) | Letting the network find a covariate relationship | A model with no between-subject variability | Saving, reloading and refitting | When you want to steer the training | Regularization, when a network learns too much | What is supported
More Trust-Region Methods: Steihaug, BOBYQA and NEWUOA26 days ago
How the methods differ | Steihaug truncated-CG trust region | What matches basin | BOBYQA and NEWUOA | The thread-safe C interfaces | References
RcppTrust: A Thread-Safe C++ Trust Region Optimizer26 days ago
Similarities: what carries over unchanged | Differences | Speed | When to use which interface | Using the C interface | Calling it from your own package: the registration pattern
Neural ODEs and nlmixr2nn: what carries over28 days ago
The problem is not the same one | Sensitivities: forward, not adjoint | What that costs, and what follows from it | Regularization | The kinetic term | Augmentation, and a limit worth knowing | What is deliberately absent | References
Repeated blocks with same() in lotri1 months ago
What same() is for | The rules | How it is stored: the condition column | Reading the column | Round trips | same() versus cnd(same = n)
Prior distributions in lotri2 months ago
Why priors are in lotri | The syntax | What a prior can be attached to | Population parameters | A single between subject variability term | A whole covariance block | Degrees of freedom for an omega block | A prior on the omega values themselves | One joint block over thetas and omega elements | One block at a time | The normal prior shorthand | More than one parameter | Transformations | Zero variance | Distribution names | Why dt() is not studentT() | The supported distributions | Bounds and truncated priors | What else is checked | Getting the priors back out | Using this downstream | A prior must never be silently ignored
Extending nlmixr2est: custom estimation methods and behavior hooks2 months ago
1. Adding a new estimation method | 2. Intercepting an estimation | Passing options to your interceptor | 3. Contributing to the objective (compiled linkage) | See also
Importing NONMEM into rxode23 months ago
Setting up nonmem2rx for your model | Pointing nonmem2rx at the input data | General linear models (ADVAN5/ADVAN7) | Technical details about reading NONMEM to rxode2
rxode2 ODE solving syntax6 months ago
Introduction | Creating rxode2 models | Syntax | Note | Example model | Example | Interface and data handling between R and the generated C code
Lotri Motivation4 years ago
Motivation | Creating lists of matrices with attached properties | Combining symmetric named matrices