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bezier
```
bezier -n value -a value -b value -x list -y list
```
Finds values of Bezier function at x points.
::tclinterp::approximation
cubicBetaSpline1d
```
cubicBetaSpline1d -beta1 value -beta2 value -t|x list -y list -ti|xi list
```
Evaluates a cubic beta spline approximant.
::tclinterp::approximation
cubicBSpline1d
```
cubicBSpline1d -t|x list -y list -ti|xi list
```
Evaluates a cubic B spline approximant.
::tclinterp::approximation

cubicSpline1d -t|x list -y list -ti|xi list ?-ibcbeg|begflag value -ybcbeg value? ?-ibcend|endflag value -ybcend value? ?-deriv?

Does piecewise cubic spline interpolation. ::tclinterp::interpolation

divDif1d
```
divDif1d -x list -y list -xi list ?-coeffs?
```
Does divided difference one-dimensional interpolation.
::tclinterp::interpolation
genBezier
```
genBezier -n value -x list -y list -t list
```
Finds values of general Bezier function at specified t points.
::tclinterp::approximation
hermiteSpline1d
```
hermiteSpline1d -t|x list -y list -yp list -ti|xi list ?-deriv?
```
Does Hermite polynomial spline interpolation.
::tclinterp::interpolation
lagr1d
```
lagr1d -x list -y list -xi list
```
Does Lagrange polynomial one-dimensional interpolation.
::tclinterp::interpolation
least1d
```
least1d -x list -y list -xi list ?-w list? ?-nterms value? ?-coeffs?
```
Does least squares polynomial one-dimensional interpolation.
::tclinterp::interpolation
least1dDer
```
least1dDer -x list -y list -xi list ?-w list? ?-nterms value? ?-coeffs?
```
Does least squares polynomial one-dimensional interpolation with calculation of its derivative.
::tclinterp::interpolation
lin1d
```
lin1d -x list -y list -xi list
```
Does linear one-dimensional interpolation.
::tclinterp::interpolation
near1d
```
near1d -x list -y list -xi list
```
Does nearest one-dimensional interpolation.
::tclinterp::interpolation
pchip1d
```
pchip1d -x list -f|y list -xe|xi list
```
Does piecewise cubic Hermite interpolation (PCHIP).
::tclinterp::interpolation