Chief Delphi - your favorite equations for build seasion

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Re: your favorite equations for build seasion

Idk, but the Law of Cosines has become more sexy than usual...

Re: your favorite equations for build seasion

Internet + Cats = Robot that doesn't work and isn't built.

Re: your favorite equations for build seasion

Most Used: (Machine Shop Algebra for finding the coordinates for paired symmetrical holes on material. With d1 being the material length, d2 being the hole pattern, and x being the distance from the hole center to the edge of the material)
x = (d1/2)-(d2/2) = (d1-d2)/2

Most Reliable: Newton's Second Law

Least Favorite: Murphys Law

Re: your favorite equations for build seasion

I've been modelling some of our robot's movements using an intersection of two circles..

(x-a)^2 + (y-b)^2 = r^2
It is ftw

Re: your favorite equations for build seasion

Can't believe no has said this yet:

V = IR

(I^2)R = VI = P

Or, to have some fun:

Fs >= 2B (any takers? it's not an exact formula, more of a theorem, and kind of hard to represent without proper math symbols)

Matt

Re: your favorite equations for build seasion

mine is used for when i get tired of the code stopping for stupid reasons

while true==true

Re: your favorite equations for build seasion

Quote:

Originally Posted by ttldomination (Post 1015906)

Idk, but the Law of Cosines has become more sexy than usual...

Trigonometry has always been rather attractive from my perspective
<3<3<3<3<3

Re: your favorite equations for build seasion

A nice little as3 script for parsing the FIRST website :)

PHP Code:


		
			
var temp:ArrayCollection = ArrayCollection(event.result);

                var tempString:String = "";

                var sentUrl:String = temp.getItemAt(0) as String;

                var eid:String = sentUrl.substr(sentUrl.search("eid=")+4,sentUrl.length);

                eid = eid.substr(0,eid.search("&"));

                for(var n:int = 1; n < temp.length; n++){

                    tempString+=temp.getItemAt(n);

                }

                tempString = tempString.substr(tempString.search('<tr bgcolor="#FFFFFF">'),tempString.length);

                tempString = tempString.substr(0, tempString.search('</table>'));

                var i:int = tempString.search('\t');

                while( i != -1){

                    tempString = tempString.replace('\t',' ');

                    i = tempString.search('\t');

                }

                i = tempString.search('<br />');

                while( i != -1){

                    tempString = tempString.replace('<br />',' ');

                    i = tempString.search('<br />');

                }

                i = tempString.search('nowrap');

                while( i != -1){

                    tempString = tempString.replace('nowrap',' ');

                    i = tempString.search('nowrap');

                }

                

                tempString = "<table>" +tempString+"</table>";

                var xml:XML = XML(tempString);

                for(i = 0; i < xml.children().length(); i++){

                    var location:String = xml.child(i).child(0).child(0).toString();

                    var name:String = xml.child(i).child(1).child(0).toString();

                    var url:String = "https://my.usfirst.org/myarea/index.lasso?page=event_details&eid="+eid+"&-session=myarea:C77D640504fbb2FB82SVt2270655"

                    var number:String = xml.child(i).child(2).child(0).child(0).toString();

                    var service:EventService = new EventService();

                    service.addMember(parseInt(eid),parseInt(number));

                }

Re: your favorite equations for build seasion

Well, in 2009 (Lunacy) our favorite equation was F=uN, or "fun," as we called it, to the point that the judges mentioned our use of "the equation 'fun'" during our DTT award speech at Championship.

Quote:

Originally Posted by jamie_1930 (Post 1015848)

All for the metric system say "I"

Jay.

Re: your favorite equations for build seasion

For those saying that W=Fd is wrong, "d" is often used for distance. You could also use "l" for "length", but "d" is more common.

I kind of like the following:

Stress = F/A.
Stress = Homework/Time.
Therefore, Homework is a force.

Oh, and then there's this one:

Reading + Manual + Updates + Q&A = someone who knows the rules and doesn't have to ask [current most annoyingly common rules question].

Re: your favorite equations for build seasion

Ehhhh. I should have mentioned that it only works for whole numbers. So measure in seconds.

Re: your favorite equations for build seasion

W=[delta]KE
Or, WAKE!!!! (as in: wake up you sleepy robotics student!)

This one is pretty nice too:
motor in = (joystick out)^3
That keeps the freshmen from cranking on the joysticks to much.

Re: your favorite equations for build seasion

Quote:

Originally Posted by jamie_1930 (Post 1015848)

-All unit conversions (although annoying. All for the metric system say "I")

I

My favorite, and most used would have to be F=ma, hands down.

Re: your favorite equations for build seasion

Quote:

Originally Posted by ttldomination (Post 1015906)

Idk, but the Law of Cosines has become more sexy than usual...

Reminds me of 2007. I was taking geometry in high school at the time, and it was awesome to be able to apply that to locating the poles on the rack. We ended up using about 80% of the IFI controller's processing power that year with all of the trig during autonomous.

And then in 2009 I was taking high school physics...man, my high school FRC experience was perfectly timed. :)

Re: your favorite equations for build seasion

Quote:

Originally Posted by lineskier (Post 1015962)

A nice little as3 script for parsing the FIRST website :)

PHP Code:


		
			
var temp:ArrayCollection = ArrayCollection(event.result);

                var tempString:String = "";

                var sentUrl:String = temp.getItemAt(0) as String;

                var eid:String = sentUrl.substr(sentUrl.search("eid=")+4,sentUrl.length);

                eid = eid.substr(0,eid.search("&"));

                for(var n:int = 1; n < temp.length; n++){

                    tempString+=temp.getItemAt(n);

                }

                tempString = tempString.substr(tempString.search('<tr bgcolor="#FFFFFF">'),tempString.length);

                tempString = tempString.substr(0, tempString.search('</table>'));

                var i:int = tempString.search('\t');

                while( i != -1){

                    tempString = tempString.replace('\t',' ');

                    i = tempString.search('\t');

                }

                i = tempString.search('<br />');

                while( i != -1){

                    tempString = tempString.replace('<br />',' ');

                    i = tempString.search('<br />');

                }

                i = tempString.search('nowrap');

                while( i != -1){

                    tempString = tempString.replace('nowrap',' ');

                    i = tempString.search('nowrap');

                }

                

                tempString = "<table>" +tempString+"</table>";

                var xml:XML = XML(tempString);

                for(i = 0; i < xml.children().length(); i++){

                    var location:String = xml.child(i).child(0).child(0).toString();

                    var name:String = xml.child(i).child(1).child(0).toString();

                    var url:String = "https://my.usfirst.org/myarea/index.lasso?page=event_details&eid="+eid+"&-session=myarea:C77D640504fbb2FB82SVt2270655"

                    var number:String = xml.child(i).child(2).child(0).child(0).toString();

                    var service:EventService = new EventService();

                    service.addMember(parseInt(eid),parseInt(number));

                }

I think we need to introduce you to our friend the regular expression...

Favorite equation for this build season? Torque = r x F. Law of Cosines comes in a close second. Though, I am also a pretty big fan of: Position = ∫∫Acceleration and the cylindrical coordinate system.