### Categories

### RSS Feed

### Search NewtonExcelBach

### Archives

### Top Posts

- Commenting a block of code in VBA
- Using Goal Seek on Multiple Cells
- Using LINEST for non-linear curve fitting
- Fitting high order polynomials
- The angle between two vectors, Python version
- Cubic Splines
- Weighted Least Squares Regression, using Excel, VBA, Alglib and Python
- Solving Quadratic, Cubic, Quartic and higher order equations; examples
- Numerical integration with on-sheet calculations
- Taming Symbols in Excel

### Recent Comments

dougaj4 on Numerical Integration; Tanh-Si… Numerical integratio… on Numerical Integration; Tanh-Si… Numerical integratio… on Numerical Integration; Tanh-Si… Dave on Numerical Integration; Tanh-Si… dougaj4 on Numerical Integration; Tanh-Si… Dave on Numerical Integration; Tanh-Si… dougaj4 on Numerical Integration; Tanh-Si… Dave McCutchan on Numerical Integration; Tanh-Si… dougaj4 on Numerical Integration; Tanh-Si… Dave McCutchan on Numerical Integration; Tanh-Si… XY Chart problems… on Plotting Charts With Gaps… XY Chart problems… on When is an XY chart not an XY… XY Chart problems… on XY Chart problems –… dougaj4 on RC Design Functions 8_03 alan green on RC Design Functions 8_03

# Tag Archives: Interpolation

## Daily Download 22: Splines and Curves

Since it was first published in 2009 my CSpline function has been the most popular download from this site. CSpline (and various associated functions) is used to fit a series of cubic curves through specified points, allowing interpolation along a smooth … Continue reading

Posted in AlgLib, Beam Bending, Charts, Charts, Coordinate Geometry, Excel, Newton, Numerical integration, UDFs, VBA
Tagged Cardinal spline, catenary curve, Cubic spline, curve fitting, Excel, Hermite Spline, Interpolation, UDF, VBA
7 Comments

## Spline Interpolation Alternatives

A recent post at Jon Peltier’s Blog looks at an “on-sheet” method of performing linear interpolation on a set of tabular data, and the following comments include a number of alternative ways of carrying out the same process, and also some … Continue reading

Posted in Excel, Maths, Newton, UDFs, VBA
Tagged Cubic splines, curve fitting, Excel, Interpolation, UDF, VBA
7 Comments

## Interpolation Update

The interpolation functions in IP2.xls have been given an overhaul: The linear and quadratic interpolations routines have been modified to accept negative values. All the routines have been modified to convert the table range to an array, rather than using a … Continue reading

Posted in Excel, Maths, Newton, UDFs, VBA
Tagged Excel, Interpolation, logarithmic interpolation, quadratic interpolation, UDF, VBA
4 Comments

## Another update to IP.xls

Following some suggestions from Mike Seymour I have modified my polyline intersection function, and added a new version. The changes are: The data ranges for the new function, IP4(), are entered as four separate ranges, so the X and Y … Continue reading

## Intersections, interpolations, and rotations

Amongst the many and varied functions provided by Excel (or as far as I know any other spreadsheet) there are none that provide a one step process for linear interpolation, finding the intersection points of lines, or conversion between polar … Continue reading

Posted in Coordinate Geometry, Excel, UDFs, VBA
Tagged Excel, Interpolation, Intersection Points, Polar Coordiantes, Rectangular Coordinates, UDF, VBA
37 Comments