| pixel value to x and y position [message #67512] |
Thu, 30 July 2009 02:27  |
marknolan2006
Messages: 5
Registered: February 2009
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Junior Member |
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hi everyone!
can anyone check if this is correct way to convert pixel value to x
and y position (iam trying
to write a simple tracking code in IDL):
y = pixel_value/width_picture
x = pixel_value mod width_picture
i really have time on the x,it gives a wrong result. i think i got the
y coordinate correctly.
thanks and GOD bless!
mark
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| Re: pixel value to x and y position [message #67555 is a reply to message #67512] |
Fri, 31 July 2009 08:00  |
David Fanning
Messages: 11724
Registered: August 2001
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Senior Member |
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Paolo writes:
> Just not to let any wrong impression by readers
> of this thread, the mod and / method does indeed
> work and delivers the same result as array_indices!
>
> a=bytarr(123,777);create test
> array
> ind=43527L ;create test index
>
> print,ind mod 123,ind / 123
> 108 353
> print,array_indices(a,ind)
> 108 353
Well, as long as we are cautioning readers, we should
probably point out than none of these (successful) methods
is probably needed. One dimensional indices work just
as well, and 99% of the time there is absolutely no
need to convert them to 2D indices.
Cheers,
David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Sepore ma de ni thui. ("Perhaps thou speakest truth.")
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| Re: pixel value to x and y position [message #67557 is a reply to message #67512] |
Fri, 31 July 2009 07:30 |
pgrigis
Messages: 436
Registered: September 2007
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Senior Member |
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On Jul 31, 3:45 am, mark nolan <marknolan2...@gmail.com> wrote:
> On Jul 31, 9:13 am, mark nolan <marknolan2...@gmail.com> wrote:
>
>
>
>> On Jul 30, 11:53 pm, Gianguido <gianguido.cia...@gmail.com> wrote:
>
>>> On Jul 30, 4:27 am, mark nolan <marknolan2...@gmail.com> wrote:
>
>>>> hi everyone!
>
>>>> can anyone check if this is correct way to convert pixel value to x
>>>> and y position (iam trying
>>>> to write a simple tracking code in IDL):
>
>>>> y = pixel_value/width_picture
>>>> x = pixel_value mod width_picture
>
>>>> i really have time on the x,it gives a wrong result. i think i got the
>>>> y coordinate correctly.
>
>>>> thanks and GOD bless!
>
>>>> mark
>
>>> is array_indices what you are looking for? how about using these free
>>> particle tracking procedures:http://www.physics.emory.edu/~weeks/idl/
>
>>> G
>
>> hey, ill try that, actually i dnt know that function, this would be my
>> first
>> time (iam new at idl).
>
>> thanks alot G and David!
>
>> GOD bless!
>> mark- Hide quoted text -
>
>> - Show quoted text -
>
> i dnt know how you do it guys but your just briliant! the
> array_indices work!! whooh!! thanks alot!
>
> GOD bless and continue to be a blessing!
>
> Cheers,
> mark
Just not to let any wrong impression by readers
of this thread, the mod and / method does indeed
work and delivers the same result as array_indices!
a=bytarr(123,777);create test
array
ind=43527L ;create test index
print,ind mod 123,ind / 123
108 353
print,array_indices(a,ind)
108 353
Ciao,
Paolo
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