v2.5.1 2026-01-27

• fixed a unit test due to new version of nlsic

v2.5 2025-05-16

• least norm is replaced by minimizing the norm of n-th derivative coeffs in under-determined systems
• dmat() gains a new parameter nderiv
• fixed flate tv curve in iknots()

v2.4 2025-03-12

• added abcisse range check for arguments in equality constraints of smbsp()
• iknots: tv can be smoothed for xki finding
• iknots: tv is smoothed till at least one x point belongs to each knot interval
• iknots: if lenfit is 0, all tv values are used for linear interpolation
• smbsp: outside or border xki are now removed with warning, not error
• [fit]smbsp: added regular_grid parameter
• fitsmbsp: default precision in xki fit is 0.01dx instead of 0.1dx
• fitsmbsp: minimal distance imposed between knots is now dx, not dx/10
• par2bsp: if select parameter is NULL, it is considered as missing

v2.3.0 2025-02-05

• added imat(), integration matrix computation
• fixed dmat() for nqw
• fixed extra quotes in bspline manual
• added parameter ‘lenfit’ to iknots()

v2.2.2 2024-07-02

• fixed typo in example of pbsc()
• fixed syntax error in manual for bsc() and bsp()
• fixed missing variable in test of example for pbsc()
• fixed missing export for pbsc()

v2.2.1 2023-05-30

• fixed typo in rgl example of bcurve()
• fixed NEWS mention of parr() for v2.2.
• added pbsc()

v2.2 2023-05-26

• added bcurve() for building nD curves from a set of control points
• added parr() polynomial formulation of B-splines

v2.1 2022-09-26

• smbsp() can estimate covariance matrix of estimated coefficients
• added dmat() for differentiation operator
• ipk() is now exported and tested
• fixed 0-value for abscissas on the right hand side of the knot interval

v2.0.1 2022-04-19

• bsc() can calculate Jacobian of basis vectors as function of knots. By consequence, the suggestion of numDeriv package is removed
• added jacw() calculating Jacobian of B-spline with weights
• added ibsp() for integration
• now, iknots() can deal with repeated x values
• added monotonicity and positivity optional constraints
• added Copyright field to DESCRIPTION
• fixed inequality generation in fitsmbsp()
• fixed gcc-12 compile error

v1.0.2 2022-03-17

• fixed ipk() ASAN problem signaled by R CRAN team
• fixed export of par2bsp()
• fixed error in example of fitsmbsp()
• fixed debug printing in iknots()
• increased resolution from 5 to 10 intervals for tv fitting by linear B-splines in iknots()
• forced monotonicity in iknots() despite possible round-off errors
• added URL and BugRepport in DESCRIPTION

v1.0.1 2022-03-11

• First release on CRAN