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GAUSS2

GAUSS2

## Author

Craig B. Markwardt, NASA/GSFC Code 662, Greenbelt, MD 20770
craigm@lheamail.gsfc.nasa.gov

## Purpose

Compute Gaussian curve given the mean, sigma and area.

## Major Topics

Curve and Surface Fitting

## Calling Sequence

YVALS = GAUSS2(X, Y, [XCENT, YCENT, SIGMA, PEAK])

## Description

This routine computes the values of a Gaussian function whose
X-values, mean, sigma, and total area are given. It is meant to be
a demonstration for curve-fitting.
XVALS can be an array of X-values, in which case the returned
Y-values are an array as well. The second parameter to GAUSS1
should be an array containing the MEAN, SIGMA, and total AREA, in
that order.

## Inputs

X - 2-dimensional array of "X"-values.
Y - 2-dimensional array of "Y"-values.
XCENT - X-position of gaussian centroid.
YCENT - Y-position of gaussian centroid.
SIGMA - sigma of the curve (X and Y widths are the same).
PEAK - the peak value of the gaussian function.

## Returns

Returns the array of Y-values.

## Example

p = [2.2D, -0.7D, 1.4D, 3000.D]
x = (dindgen(200)*0.1 - 10.) # (dblarr(200) + 1)
y = (dblarr(200) + 1) # (dindgen(200)*0.1 - 10.)
z = gauss2(x, y, p)
Computes the values of the Gaussian at equispaced intervals in X
and Y (spacing is 0.1). The gaussian has a centroid position of
(2.2, -0.7), standard deviation of 1.4, and peak value of 3000.

## Modification History

Written, 02 Oct 1999, CM