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GAUSS1

GAUSS1

## 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 = GAUSS1(XVALS, [MEAN, SIGMA, AREA], SKEW=skew)

## 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 - Array of X-values.
[MEAN, SIGMA, AREA] - the mean, sigma and total area of the
desired Gaussian curve.

## Input Keyword Parameters

SKEW - You may specify a skew value. Default is no skew.
PEAK - if set then AREA is interpreted as the peak value rather
than the area under the peak.

## Returns

Returns the array of Y-values.

## Example

p = [2.2D, 1.4D, 3000.D]
x = dindgen(200)*0.1 - 10.
y = gauss1(x, p)
Computes the values of the Gaussian at equispaced intervals
(spacing is 0.1). The gaussian has a mean of 2.2, standard
deviation of 1.4, and total area of 3000.

## Modification History

Written, Jul 1998, CM
Correct bug in normalization, CM, 01 Nov 1999
Optimized for speed, CM, 02 Nov 1999