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Eedis
PostPosted: April 16th, 2011, 1:57 am 
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Joined: June 12th, 2009, 11:36 pm
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Location: Indianapolis IN, USA
I posted this in General Chat as I am not asking for code, I just need the mathematical formula to figure out the problem.

I am two points, A and B. Given both the x and y coordinates and assuming the distance from x1 to x2 is 1P, what formula could I use to figure out the distance, in a straight line, from both points with completely different x coord's and y coord's. I figure I would need to figure the slope, but I have no idea where to go from there.

This is why I wish I paid more attention in Algebra. :/

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codybear
PostPosted: April 16th, 2011, 2:00 am 
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Joined: September 15th, 2009, 1:14 am
Posts: 562
Location: Tempe, Arizona
Eedis wrote:
I posted this in General Chat as I am not asking for code, I just need the mathematical formula to figure out the problem.

I am two points, A and B. Given both the x and y coordinates and assuming the distance from x1 to x2 is 1P, what formula could I use to figure out the distance, in a straight line, from both points with completely different x coord's and y coord's. I figure I would need to figure the slope, but I have no idea where to go from there.

This is why I wish I paid more attention in Algebra. :/


Distance formula:
Image

[Edit]For more information: I got that image above from: http://www.purplemath.com/modules/distform.htm
They usually have some good math tutorials at that site as I have used them to help tutor my friends in math along with a few others that have popped up during a google search.[/edit]

Hope this helps!

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nimda
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PostPosted: April 16th, 2011, 2:03 am 
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Joined: December 26th, 2010, 7:40 pm
Posts: 4172
Location: Awesometown, USA
Code:
X1:=0, Y1:=0, X2:=3, Y2:=3
distance := sqrt((y2-y1)**2+(X2-X1)**2)
MsgBox % Distance " should equal the square-root of 18:`n" sqrt(18)

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Eedis
 Post subject:
PostPosted: April 16th, 2011, 2:03 am 
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Joined: June 12th, 2009, 11:36 pm
Posts: 1173
Location: Indianapolis IN, USA
Awesome, thanks, I'll have to browse this for a bit. :)

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codybear
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PostPosted: April 16th, 2011, 2:12 am 
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Joined: September 15th, 2009, 1:14 am
Posts: 562
Location: Tempe, Arizona
Stupid image...it worked at first, must be hotlink protected lol.

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nimda
 Post subject:
PostPosted: April 16th, 2011, 2:27 am 
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Joined: December 26th, 2010, 7:40 pm
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Location: Awesometown, USA
@codybear:
1.)Save image as
2.)upload to AutoHotkey.net
3.)???
4.)Profit

Image

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codybear
 Post subject:
PostPosted: April 16th, 2011, 4:04 am 
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Posts: 562
Location: Tempe, Arizona
nimda wrote:
@codybear:
1.)Save image as
2.)upload to AutoHotkey.net
3.)???
4.)Profit

Image

hahhah. Yeah, I was trying to take the easy way out. :D

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nimda
 Post subject:
PostPosted: April 16th, 2011, 12:48 pm 
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It's all done within the .htaccess file. All the hotlink wizardry, that is.

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a4u
 Post subject:
PostPosted: April 16th, 2011, 6:23 pm 
Eedis wrote:
This is why I wish I paid more attention in Algebra. :/
Pythagorean Theorem & Quadratic Formula - two things my Algebra II teacher said to Never Forget :wink:


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PEG
 Post subject: function to add
PostPosted: January 5th, 2012, 4:30 pm 
Code:
distcords(X1,Y1,X2,Y2)
   {
      Return sqrt((Y2-Y1)**2+(X2-X1)**2)
      ;~ Round(sqrt((Y2-Y1)**2+(X2-X1)**2))
      
   }


Code:
Usage:
distcords(0,0,100,100)

would return ~141.421... (the rounded version 141.421 = 141)


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Mickers
 Post subject:
PostPosted: January 5th, 2012, 5:33 pm 
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Joined: October 11th, 2010, 6:15 pm
Posts: 1211
Location: Right behind you
@Eadis
Is this for land navigation?

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Zaelia
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PostPosted: January 6th, 2012, 12:31 am 
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Posts: 641
Location: France
@Mickers: we will use other thing for land navigation, as "Orthodromy"
http://en.wikipedia.org/wiki/Great-circle_distance
We need to use a lot trigonometry, else simple case is "Orthonormality" when "plan/map" is only in 2D and vector are in right angle and same unit length (therefore Pythagor), else only use vector formula (Chales and other)...

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Mickers
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PostPosted: January 6th, 2012, 2:40 pm 
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Mabye it's too early in the morning but I can't translate anything you just said... :lol:

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IsNull
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PostPosted: January 6th, 2012, 5:23 pm 
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Joined: May 10th, 2007, 10:54 am
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Location: .switzerland
Mickers wrote:
Mabye it's too early in the morning but I can't translate anything you just said... :lol:

I think she means that for real navigation calculations, complexer math would be requiered, as the world is not flat and even not a sphere. :) Pythagoras requires a (2D) right-angled triangle.

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Mickers
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PostPosted: January 6th, 2012, 5:52 pm 
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Location: Right behind you
Ok.

I just wanted to know if this was for passing Army land navigation tests which I have a lot of experience with. I was going to give any advice he may / may not need. :wink:

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