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<html><head><title>Funtools FAQ: Filtering</title></head>
<p>
NB: column filters work on tables only. Regions work on tables and images.
<p>
<ol>
<li><a name="faq1"><b>Please show how to use column and regions filters</b></a>
<p>
<ol>
<li> Filter events through a circular region using physical pixels
<BLOCKQUOTE><CODE>
<PRE>
fundisp foo.fits'[circle(512,512,.5)]'
X Y PHA PI TIME DX DY
---- ---- --- --- --------------------- ---- ----
512 512 6 7 79493997.45854475 578 574
512 512 8 9 79494575.58943175 579 573
512 512 5 6 79493631.03866175 578 575
512 512 5 5 79493290.86521725 578 575
512 512 8 9 79493432.00990875 579 573
</PRE>
</CODE></BLOCKQUOTE>
<li> Filter events through a circular region, for a single value of pha
<BLOCKQUOTE><CODE>
<PRE>
fundisp foo.fits'[circle 512 512 .5 && pha==5]'
X Y PHA PI TIME DX DY
---- ---- --- --- --------------------- ---- ----
512 512 5 6 79493631.03866175 578 575
512 512 5 5 79493290.86521725 578 575
</PRE>
</CODE></BLOCKQUOTE>
<li> Filter events through a circular region, including a range of pha values
<BLOCKQUOTE><CODE>
<PRE>
fundisp foo.fits'[circle(512,512,.5)&&pha=5:6]'
X Y PHA PI TIME DX DY
---- ---- --- --- --------------------- ---- ----
512 512 6 7 79493997.45854475 578 574
512 512 5 6 79493631.03866175 578 575
512 512 5 5 79493290.86521725 578 575
</PRE>
</CODE></BLOCKQUOTE>
<li> Filter events through a circular region, excluding a range of pha values
<BLOCKQUOTE><CODE>
<PRE>
fundisp foo.fits'[circle(512,512,.5)&&\!pha=5:6]'
X Y PHA PI TIME DX DY
---- ---- --- --- --------------------- ---- ----
512 512 8 9 79494575.58943175 579 573
512 512 8 9 79493432.00990875 579 573
</PRE>
</CODE></BLOCKQUOTE>
<li> Filter events through two circular regions
<BLOCKQUOTE><CODE>
<PRE>
fundisp foo.fits'[circle(512,512,.5); circle 500 500 .1]'
X Y PHA PI TIME DX DY
---- ---- --- --- --------------------- ---- ----
500 500 5 5 79493733.05197725 600 577
500 500 9 9 79488217.13936825 600 576
500 500 2 2 79487590.99904275 599 581
512 512 6 7 79493997.45854475 578 574
512 512 8 9 79494575.58943175 579 573
512 512 5 6 79493631.03866175 578 575
512 512 5 5 79493290.86521725 578 575
512 512 8 9 79493432.00990875 579 573
</PRE>
</CODE></BLOCKQUOTE>
<li> Filter events through a circular region, selecting a single time value
<BLOCKQUOTE><CODE>
<PRE>
fundisp foo.fits'[circle(512,512,.5)&&time==79493631.03866175]'
X Y PHA PI TIME DX DY
---- ---- --- --- --------------------- ---- ----
512 512 5 6 79493631.03866175 578 575
</PRE>
</CODE></BLOCKQUOTE>
<li> Filter events through a circular region, selecting a single time value
(but using feq to avoid possible precision problems)
<BLOCKQUOTE><CODE>
<PRE>
fundisp foo.fits'[circle(512,512,.5)&&feq(time,79493631.03866175)]'
X Y PHA PI TIME DX DY
---- ---- --- --- --------------------- ---- ----
512 512 5 6 79493631.03866175 578 575
</PRE>
</CODE></BLOCKQUOTE>
<li> Filter events through a circular region, while excluding an inner circle
<BLOCKQUOTE><CODE>
<PRE>
fundisp foo.fits'[circle(512,512,1);-cir 512 512 .5]'
X Y PHA PI TIME DX DY
---- ---- --- --- --------------------- ---- ----
512 511 9 9 79492909.11908525 580 572
512 511 6 7 79492607.35239075 580 573
512 511 6 7 79493574.08603576 580 573
512 511 7 8 79488537.75487424 579 572
511 512 5 5 79488781.64644176 579 576
511 512 5 6 79492586.05470325 579 576
511 512 10 10 79494397.55842775 580 574
511 512 1 2 79493697.87522624 577 582
511 512 6 7 79493997.75123225 579 575
511 512 10 11 79487417.67703976 579 574
513 512 6 6 79493306.47509325 578 573
513 512 8 8 79487909.39373726 578 572
512 513 4 4 79487403.52010125 576 577
512 513 8 9 79492536.31151475 577 574
512 513 10 10 79492589.71195325 578 574
512 513 5 5 79488335.19512025 576 575
512 513 8 8 79493661.25728776 578 574
512 513 8 9 79487914.98186225 577 574
512 513 5 5 79487392.91247626 577 576
512 513 4 4 79492808.24789475 577 576
512 513 7 8 79493236.90765475 577 574
512 513 6 7 79493667.65710025 578 574
</PRE>
</CODE></BLOCKQUOTE>
<li> Filter events through a circular region for a range of pha, while excluding an inner circle
<BLOCKQUOTE><CODE>
<PRE>
fundisp foo.fits'[circle(512,512,1)&&pha=6:7;-cir 512 512 .5]'
X Y PHA PI TIME DX DY
---- ---- --- --- --------------------- ---- ----
512 511 6 7 79492607.35239075 580 573
512 511 6 7 79493574.08603576 580 573
512 511 7 8 79488537.75487424 579 572
511 512 6 7 79493997.75123225 579 575
513 512 6 6 79493306.47509325 578 573
512 513 7 8 79493236.90765475 577 574
512 513 6 7 79493667.65710025 578 574
</PRE>
</CODE></BLOCKQUOTE>
<li> Filter events through a circular region for ranges of pha and pi, while excluding an inner circle
<BLOCKQUOTE><CODE>
<PRE>
fundisp foo.fits'[circle(512,512,1)&&pha=5:7 && pi=6:8;-cir 512 512 .5]'
X Y PHA PI TIME DX DY
---- ---- --- --- --------------------- ---- ----
512 511 6 7 79492607.35239075 580 573
512 511 6 7 79493574.08603576 580 573
512 511 7 8 79488537.75487424 579 572
511 512 5 6 79492586.05470325 579 576
511 512 6 7 79493997.75123225 579 575
513 512 6 6 79493306.47509325 578 573
512 513 7 8 79493236.90765475 577 574
512 513 6 7 79493667.65710025 578 574
</PRE>
</CODE></BLOCKQUOTE>
<li> Filter events through a circular region in fk5 coords (degrees)
<BLOCKQUOTE><CODE>
<PRE>
fundisp foo.fits'[fk5;circle(345.25391,58.879774,3.9999997")]'
X Y PHA PI TIME DX DY
---- ---- --- --- --------------------- ---- ----
512 512 6 7 79493997.45854475 578 574
512 512 8 9 79494575.58943175 579 573
512 512 5 6 79493631.03866175 578 575
512 512 5 5 79493290.86521725 578 575
512 512 8 9 79493432.00990875 579 573
</PRE>
</CODE></BLOCKQUOTE>
<li> Filter events through a circular region retrieved from ds9
<BLOCKQUOTE><CODE>
<PRE>
cat foo.reg
# Region file format: DS9 version 4.0
# Filename: foo.fits'[EVENTS]'
global color=green font="helvetica 10 normal" select=1 highlite=1 edit=1 move=1 delete=1 include=1 fixed=0 source
fk5
circle(345.25391,58.879774,3.9999997")
fundisp foo.fits'[@foo.reg]'
X Y PHA PI TIME DX DY
---- ---- --- --- --------------------- ---- ----
512 512 6 7 79493997.45854475 578 574
512 512 8 9 79494575.58943175 579 573
512 512 5 6 79493631.03866175 578 575
512 512 5 5 79493290.86521725 578 575
512 512 8 9 79493432.00990875 579 573
</PRE>
</CODE></BLOCKQUOTE>
</ol>
</ol>
|
