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| prajwel |
04/04/2015 12:00PM (Read 1083 times)
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Status: offline
Registered: 02/24/2014
Posts: 7
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Hi,
I want to know the standard deviation of pixel values in a circular region. I tried in this manner, but failed.
PHP Formatted Code cl > type expr ((sqrt((I -256)**2) + (J -256)**2) >= 5) ? -1 : a )
cl > imexpr @expr statimg a =M13refim .fits
cl > imstat statimg
I obtained the above idea from a forum post \$this->_split2($m[0])\$this->_split2($m[0]) https://iraf.net/forum/viewtopic.php?showtopic=109273
Any help or suggestion would be greatly appreciated. Thank you in advance for your help.
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| prajwel |
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04/05/2015 12:18PM
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Status: offline
Registered: 02/24/2014
Posts: 7
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I am quiet glad to say that I figured it out on my own. Thanks anyway. 
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| prajwel |
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04/05/2015 07:59PM
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Status: offline
Registered: 02/24/2014
Posts: 7
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For anyone curious, I did it in this manner.
1. create a file, in my case "expr", with this inside PHP Formatted Code ((sqrt((I -256)**2 + (J -256)**2) <= 50) ? a : -1)
2. then, I ran this PHP Formatted Code imexpr @expr statimg M13Irefnew1 .fits
3. finally, PHP Formatted Code imstat statimg .fits lower =0
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Imstat on circular region 
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