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<!doctype html public "-//w3c//dtd html 4.0 transitional//en">
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   <title>DPUSER - The Next Generation: Examples</title>
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<div id="header">DPUSER - The Next Generation</div>
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<h1>Examples</h1>
In this section, a few examples how to use of DPUSER are given. This very
often is the fastest way to learn how a software package works.
<h3>
Printing the ASCII character set</h3>
Assign the ASCII character set to a string variable and print it out
<blockquote><tt>ascii = ""&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
// create empty string variable</tt>
<br><tt><a href="ifandloop.html#loops">for</a> (i = 32; i &lt;= 255; i++)
ascii += <a href="function_char.html">char</a>(i) // assign values</tt>
<br><tt>print ascii&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
// display on screen</tt></blockquote>

<h3>
Getting information on files</h3>
Create a list of files and show their sizes
<blockquote><tt>list = <a href="function_findfile.html">findfile</a>("*.cpp")&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
// find all C++ files</tt>
<br><tt>size = <a href="function_longarray.html">longarray</a>(<a href="function_nelements.html">nelements</a>(list))&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
// create matrix for file sizes</tt>
<br><tt>for (i = 1; i &lt;= nelements(list); i++ {</tt>
<br><tt>&nbsp; size[i] = <a href="function_filesize.html">filesize</a>(list[i])&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
// assign values and print out</tt>
<br><tt>&nbsp; print "file " + list[i] + " has a size of " + size[i] /
1024 + " kB"</tt>
<br><tt>}</tt></blockquote>

<h3>
Reducing speckle data</h3>
This example shows how a standard speckle data reduction could look like.
<blockquote><tt>dark = <a href="function_cubeavg.html">cubeavg</a>('darkcube.fits')&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
// create dark frame</tt>
<br><tt>sky&nbsp; = cubeavg('sky.fits')&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
// sky</tt>
<br><tt>dpl&nbsp; = <a href="function_dpixcreate.html">dpixcreate</a>(sky,
5)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
// dead pixel list</tt>
<br><tt>dpl[128,*] = 1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
// assume 128th row is dead</tt>
<br><tt>flat = <a href="function_dpixapply.html">dpixapply</a>(sky
- dark, dpl) // create flat field</tt>
<br><tt>flat = median(flat) / flat&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
// take inverse of flat field</tt>
<br><tt>lxp&nbsp; = dpixapply(cubeavg('object.cube') - sky, dpl)</tt>
<br><tt>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
// long exposure</tt>
<br><tt>'object.lxp' = lxp&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
// write lxp to disk</tt>
<br><tt>x&nbsp;&nbsp;&nbsp; = <a href="function_xmax.html">xmax</a>(lxp)</tt>
<br><tt>y&nbsp;&nbsp;&nbsp; = <a href="function_ymax.html">ymax</a>(lxp)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
// find position of maximum</tt>
<br><tt>naxis1 = <a href="function_naxis1.html">naxis1</a>(lxp)</tt>
<br><tt>naxis2 = <a href="function_naxis2.html">naxis2</a>(lxp)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
// set up global variables</tt>
<br><tt>mask = <a href="function_circle.html">circle</a>(x, y, 20)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
// create mask for ssa</tt>
<br><tt>'object.ssa' = <a href="function_ssa.html">ssa</a>('object.cube',
x, y, sky, flat, dpl, mask)</tt>
<br><tt>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
// do ssa and write to disk</tt>
<br><tt>x&nbsp;&nbsp;&nbsp; = naxis1 / 2 + 1</tt>
<br><tt>y&nbsp;&nbsp;&nbsp; = naxis2 / 2 + 1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
// center of the array</tt>
<br><tt>psf&nbsp; = norm(<a href="function_center.html">center</a>('object.ssa')
* <a href="function_cosbell.html">cosbell</a>(x, y, 5, 20))</tt>
<br><tt>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
// Point Spread Function</tt>
<br><tt>'object.wien' = <a href="function_wien.html">wien</a>('object.ssa',
psf) // deconvolve</tt></blockquote>
This standard reduction works fine if the object is dominated by one bright
source. For faint sources or many objects of comparable brightness in the
field of view, a more sophisticated reduction is necessary. See the <a href="function_ssa.html">help
on ssa</a> for more information.

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