StepInterp

(stub)

Declaration

StepInterp( D,A,X,I)

Notes

StepInterp uses a "left-step" -- the step up takes place at the left side of each interval. Sometimes you might want a "right-step", using the previous value smaller than or equal to X, rather than the next value greater than or equal to X. One implementation of this other variant is a UDF:

Function RStepInterp(D:ascending[I] ; R:Array[I] ; X ; I : Index )
Definition: 
   Var pos := StepInterp(D,@I,X,I);
   R[@I= if X=D[@I=pos] then pos else max([1,pos-1]) ]

See Also

• LinearInterp
• CubicInterp