simlandr
Potential landscape tooling settling onto standard R generics after two rounds of renaming.
Comparison · Analytics
aqp vs splines2
A side-by-side editorial comparison of aqp and splines2 — release velocity, themes, recent moves, and the top alternatives to consider.
Shared themes:r-package
aqp vs splines2: at a glance
What is aqp?
The 1.x line, tagged retroactively after a decade of SoilProfileCollection redesign.
aqp provides the SoilProfileCollection class and the algorithms built on it for soil profile data, colour, and taxonomy. The most recent tag in this feed is explicitly retroactive: 1.42 was cut in 2025 to mark the last CRAN state before the 2.0 release. Between 2018 and 2021 the class internals were reworked twice, the Munsell colour tooling grew substantially, and data.table replaced reshape underneath the wide-to-long transformations.
What is splines2?
Spline bases built to interoperate: periodic B-splines and an nsk-compatible natural basis.
splines2 provides spline basis functions with their derivatives and integrals, in R and through an Rcpp interface. The 0.5.0 release in mid-2023 set the package's current surface; the four releases since are a correctness fix for natural cubic splines with one internal knot, a plotting argument, a compiler warning, and a documentation repair.
aqp vs splines2: editorial side-by-side
aqp
0.0ANALYTICS
The 1.x line, tagged retroactively after a decade of SoilProfileCollection redesign.
◆ Current state
aqp provides the SoilProfileCollection class and the algorithms built on it for soil profile data, colour, and taxonomy. The most recent tag in this feed is explicitly retroactive: 1.42 was cut in 2025 to mark the last CRAN state before the 2.0 release. Between 2018 and 2021 the class internals were reworked twice, the Munsell colour tooling grew substantially, and data.table replaced reshape underneath the wide-to-long transformations.
◆ Where it's heading
Two threads run through the window. The core object was progressively rebuilt - a new horizon-ID slot in 1.17, then a wave of renames and argument removals in 1.25 that broke code deliberately ahead of 2.0. Alongside it, colour work compounded: mixMunsell, spectral mixing, colour quantiles, a chip-frequency chart, and PMS conversion. Tag order here is not release order, since 1.42 was applied to an older commit.
◆ Prediction
This feed reads as a closed chapter - further entries on it would be backfill, with active work having moved to the 2.x series.
splines2
0.0ANALYTICS
Spline bases built to interoperate: periodic B-splines and an nsk-compatible natural basis.
◆ Current state
splines2 provides spline basis functions with their derivatives and integrals, in R and through an Rcpp interface. The 0.5.0 release in mid-2023 set the package's current surface; the four releases since are a correctness fix for natural cubic splines with one internal knot, a plotting argument, a compiler warning, and a documentation repair.
◆ Where it's heading
The direction is interoperability rather than new mathematics. 0.5.0 added nsk() to match survival::nsk(), an H matrix for converting cubic B-splines produced elsewhere into this package's natural splines, and short aliases meant to be typed inside model formulas. Periodic B-splines were the one genuinely new basis, and its Rcpp knot-sequence handling needed a follow-up fix. Wenjie Wang maintains it alongside intsurv and reda.
◆ Prediction
The last four releases are all corrections, so the next one most likely continues that pattern; a further basis type would break a two-year run of consolidation.
Alternatives to aqp and splines2
Other Analytics products tracked by Sparkpulse, ranked by recent ship velocity. Each card links to a full editorial trajectory and lets you pivot into a head-to-head comparison with either aqp or splines2.
lavaanExtra
SEM reporting helpers converging on APA output, one CRAN resubmission at a time.
ibis.iSDM
A raster-to-terra migration is the only readable change in a feed of merge notes.
anyflights
A nycflights13 generator whose recent work is all about the data being right.
vinereg
Conditional density and log-likelihood fill out a vine copula regression package.
stringx
A drop-in string API for base R, kept alive by upstream check failures.
See all aqp alternatives → · See all splines2 alternatives →
Recent activity from aqp and splines2
Latest ship moves from both products, interleaved chronologically. ⚡ = editorial spark.
- 1y agosplines2Natural cubic splines fixed for a single internal knot
- 1y agoaqpRetroactive tag for the last 1.x CRAN state
- 2y agosplines2C++20 constructor template warning suppressed
- 2y agosplines2plot() accepts a coefficient vector
- 2y agosplines2Broken package-level documentation repaired
- 3y agosplines2Periodic B-splines, nsk(), and a basis conversion matrix ⚡
- 3y agosplines2Periodic M-spline knot sequence fixed in the Rcpp interface
- 4y agoaqpMunsell mixing gains an exact spectral method
- 5y agoaqpdata.table replaces reshape under the class internals
- 5y agoaqpCore class methods renamed and pruned ahead of 2.0 ⚡
- 7y agoaqpNew horizon-ID slot closes the 1.x major line
Frequently asked questions
What is the difference between aqp and splines2?
Both compete on the same themes — r-package — within Analytics. aqp and splines2 are shipping at a similar cadence (velocity 0.0 vs 0.0, both within Sparkpulse's "active" band). See the at-a-glance table above for a side-by-side breakdown of velocity, recent sparks, and editorial themes.
Is aqp better than splines2?
Sparkpulse doesn't pick a winner — we score release velocity, not feature parity. aqp and splines2 are shipping at a similar cadence (velocity 0.0 vs 0.0, both within Sparkpulse's "active" band). For your specific use case, the alternatives sections above list other Analytics products to evaluate alongside.
What are the best alternatives to aqp?
Top aqp alternatives in Analytics are ranked by recent ship velocity. Browse the "aqp alternatives" section above for the current picks, or visit /alternatives/aqp for the full list with editorial commentary on each.
What are the best alternatives to splines2?
Top splines2 alternatives in Analytics are ranked by recent ship velocity. Browse the "splines2 alternatives" section above for the current picks, or visit /alternatives/splines2 for the full list with editorial commentary on each.