ricci

Description

Provides a compact 'R' interface for performing tensor calculations. This is achieved by allowing (upper and lower) index labeling of arrays and making use of Ricci calculus conventions to implicitly trigger contractions and diagonal subsetting. Explicit tensor operations, such as addition, subtraction and multiplication of tensors via the standard operators, raising and lowering indices, taking symmetric or antisymmetric tensor parts, as well as the Kronecker product are available. Common tensors like the Kronecker delta, Levi Civita epsilon, certain metric tensors, the Christoffel symbols, the Riemann as well as Ricci tensors are provided. The covariant derivative of tensor fields with respect to any metric tensor can be evaluated. An effort was made to provide the user with useful error messages.

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Running ‘testthat.R’ [8s/8s]
Running the tests in ‘tests/testthat.R’ failed.
Complete output:
  > # This file is part of the standard setup for testthat.
  > # It is recommended that you do not modify it.
  > #
  > # Where should you do additional te
...[truncated]...
4.     └─testthat:::verify_exec(quo_get_expr(x), quo_get_env(x), replay)
   5.       └─withr::local_pdf(device_path)
   6.         └─grDevices::pdf(new, ...)
  
  [ FAIL 1 | WARN 0 | SKIP 18 | PASS 142 ]
  Error:
  ! Test failures.
  Execution halted

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R Observatory began tracking this package on Mar 10, 2026; it first appeared on CRAN Sep 4, 2025. Releases before tracking aren’t shown.