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Topic: Isolating r from this equation (Read 7465 times)previous topic - next topic

nikkoderic

Dec 26, 2013, 02:31 pm
Hi Arduino people!

Can you please isolate the variable r and simplify this equation (attached)? Don't worry it's not my homework. I tried Microsoft Mathematics to simplify but it can't. I don't have Mathematica so I can't use that.

I need this equation for my project in Arduino. I can't put it into my code.

Your help is appreciated. If this equation works I will share it here.

robtillaart

#1
Dec 26, 2013, 05:35 pm
imho it is impossible to extract r from the equation.
think there might be a  solution for   r== infinity.  as that removes all x y and z parts

you could make a first step by defining d= (x^2)/(2x r^2); similar for y and z

Where does this formula comes from?
Rob Tillaart

Nederlandse sectie - http://arduino.cc/forum/index.php/board,77.0.html -
(Please do not PM for private consultancy)

#2
Feb 12, 2014, 12:08 pm

Hi Arduino people!

Can you please isolate the variable r and simplify this equation (attached)? Don't worry it's not my homework. I tried Microsoft Mathematics to simplify but it can't. I don't have Mathematica so I can't use that.

I need this equation for my project in Arduino. I can't put it into my code.

Your help is appreciated. If this equation works I will share it here.

The first you can do is to Reduct to a common denominator.

liuzengqiang

#3
Feb 13, 2014, 03:04 am
Are you trying to solve r with given x,y,z? Do you know if it is solvable and how many roots r has? The original question that spawned this equation would answer some of the questions I/we have.

ThatGuy007

#4
Feb 21, 2014, 07:48 am
I thought i could help, so i plugged it into maple, but it cant solve it. Maybe with more information it could.

robtillaart

#5
Feb 21, 2014, 07:34 pm
The OP did not answered the question yet where the formula comes from (see post 2)

From the vars in the formula I guess it is a sort of 3d - distance function ?
Rob Tillaart

Nederlandse sectie - http://arduino.cc/forum/index.php/board,77.0.html -
(Please do not PM for private consultancy)

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