INTERP

Name

interp

Purpose (one Line)

One dimensional interpolation onto a new x grid (both irregular)

Description

Calling Sequence

interp,x1,y1,x2,y2,e2,E1=e1

Inputs

x1 - Input X array.
y1 - Matching input Y array.
x2 - New X array to interpolate Y to.

Optional Input Parameters

Keyword Parameters

E1 - Array of uncertainties for Y. Default=equal uncertainties.

Outputs

y2 - Interpolated values of y1 that match the x2 array.
e2 - Array of uncertainties for interpolated values. For each
interpolation point, uncertainties are calculated using the
left and the right uncertainties. The minimum of these
becomes the final uncertainty. Returned only if E1 is specified.

Common Blocks

Side Effects

Restrictions

Procedure

Modification History

Written by Marc W. Buie, Lowell Observatory, 1992 Sep 28.
5/19/93, DWL, Modified the uncertainty computation.
97/11/13, MWB, Moved e1 to a keyword, uncertainties are now optional.
98/4/2, MWB, Fixed bug in returned e2 value.
2000/01/31, MWB, Fixed minor bug in loop index, now converted to long.