kiran_darkchocolate Posted November 28, 2010 Report Share Posted November 28, 2010 hi,can someone please help me get started with the portfolio? I am quite lost. Reply Link to post Share on other sites More sharing options...
IBpanda Posted November 28, 2010 Report Share Posted November 28, 2010 Emm..Got the porfolio on Friday, spent the lesson using square paper and ruler trying to figure out what to do...got to the Trig part and confused myself....Came back home and tried to use Excel got even more confused.Now can someone Help me please?~ Reply Link to post Share on other sites More sharing options...
JavierG Posted November 29, 2010 Report Share Posted November 29, 2010 Once chosen the speed of both Angie and buddy, the period and the distance, you draw the graph. The thing is, when you have the triangles, in order to find out the coordinates of buddy, how do you get them?I have drawn the triangles, and I have tried out the tipical Sen A = a/c and all that stuff, but I don't know how to find out that angle.It's hard to explain. Does anyone know what I'm talking about? Reply Link to post Share on other sites More sharing options...
kiran_darkchocolate Posted December 1, 2010 Report Share Posted December 1, 2010 (edited) How do you find the coordinates of the buddy's position? Edited December 27, 2010 by 2401 Tangents your sentence makes sense now Reply Link to post Share on other sites More sharing options...
kevinet Posted December 3, 2010 Report Share Posted December 3, 2010 Hey,I have finished the portofolio with excel it was doable, but I am just wondering, does anyone tried to do this using calculus? Reply Link to post Share on other sites More sharing options...
wombat123 Posted December 3, 2010 Report Share Posted December 3, 2010 No, unfortunately I also used Excel.....I suck at Excel, and I think my failage tech skills must have ruined a lot of the simulations I did in the portfolio. How many simulations did you end up doing? Reply Link to post Share on other sites More sharing options...
wasever Posted December 7, 2010 Report Share Posted December 7, 2010 (edited) No, unfortunately I also used Excel.....I suck at Excel, and I think my failage tech skills must have ruined a lot of the simulations I did in the portfolio. How many simulations did you end up doing?DANG! Do we have to make ACTUAL simulations? I don't know how!Please help! Can someone give me a link or something that'll teach me how?! Edited December 27, 2010 by 2401 Tangents no text speak Reply Link to post Share on other sites More sharing options...
LEIII Posted December 7, 2010 Report Share Posted December 7, 2010 Im stuck at finding recursive formula and discrete mathematical modelI tried using excel but i have no clue about what's going oncan anyone give me a guide or tips on that?? Reply Link to post Share on other sites More sharing options...
ibnub Posted December 8, 2010 Report Share Posted December 8, 2010 Well, I'm a few days into it, and I was thinking about using trig to find the recursive formulas. Anyway what I am really looking for is a good program to do the simulations. I have excel but I am wondering if whether you guys know of any better programs? Thanks Reply Link to post Share on other sites More sharing options...
wombat123 Posted December 8, 2010 Report Share Posted December 8, 2010 (edited) We didn't have to actually do the simulations? I was stupid and procrastinated, so I didn't discuss everything with my friends (that and most of the other math HL people in my grade are extremely competitive and secretive). I already handed mine in, but if you find that we were/are supposed to do the actual simulations, I used the "fill down technique" on Excel (I think that's what it's called). It's the one where you can drag and get values. I couldn't find a Youtube video on it though. But then again, that might be my really sucky search/tech skills. Also, my version of Excel is really messed and seemed not to work the same as everyone else's, including the fill down technique (that's also why I'm worried that it messed up my values, most of which I didn't look over). Edited December 8, 2010 by wombat123 Reply Link to post Share on other sites More sharing options...
wasever Posted December 8, 2010 Report Share Posted December 8, 2010 (edited) Oh I don't know..... I don't even know where to begin! What values did your teacher give you? Because my teacher didn't give us any values. And now she's in Japan holidaying Plus, what were your units on the x and y axes?I mean, x is supposed to be distance right? Thats what the diagram shows. If that IS the case, and the y axis is angie's displacement, what is the slope supposed to be?! displacement vs distance doesn't yield anything Edited December 27, 2010 by 2401 Tangents no text speak Reply Link to post Share on other sites More sharing options...
ibnub Posted December 9, 2010 Report Share Posted December 9, 2010 Alright okay...Ill see what I can do with excel...Anyway your teacher is supposed to have provided you with the values and if you don't have them I really wouldn't know what to do.well and about the graph question above, the graph just allows us to visualize the problem. It displays the position of the two runners on the coordinate plane and isn't there to show a relationship... Reply Link to post Share on other sites More sharing options...
wombat123 Posted December 9, 2010 Report Share Posted December 9, 2010 Ditto to the above. The diagram is meant to help you visualize, and I strongly suggest you use it to conceptualize the situation. You may decide to use the same axes in your own diagrams if you wish. When's yours due? If you're still stuck, I suggest drawing on the diagram or drawing them up yourself. From there you may be able to see how you would incorporate the trig. Reply Link to post Share on other sites More sharing options...
Maulik Posted December 11, 2010 Report Share Posted December 11, 2010 guys i have finished some part but i am stuck with finding the recursive formula. so please help me with that part. Reply Link to post Share on other sites More sharing options...
wasever Posted December 13, 2010 Report Share Posted December 13, 2010 My teacher says we HAVE to use calculus. Is that true? Who used calculus? And how?Please help Reply Link to post Share on other sites More sharing options...
waleed Posted December 23, 2010 Report Share Posted December 23, 2010 I am sorry guys but I dont know what values of speed to stat with and how to justify them. If any one can help I will be very grateful. Reply Link to post Share on other sites More sharing options...
dessskris Posted December 23, 2010 Report Share Posted December 23, 2010 I am sorry guys but I dont know what values of speed to stat with and how to justify them. If any one can help I will be very grateful.Hmm I am not doing this portfolio yet (probably going to do it in IB2) but I have read the task and in my opinion, their speeds may depend on the distance and how often Buddy looks up, and their speeds should be as rational as possible.Let the distance be 50 m.Let Buddy changes his direction every 1 s. (doesn't really make sense but I don't care)Would you set Buddy's speed to be 100 m/s? Would you set Angie's speed to be 50 m/s?I myself think 1-3 m/s speed for Angie would be reasonable and around there too for Buddy..If you have a dog you may want to carry out an experiment.. Ask it to run a few metres and calculate the time taken haha Do the same to yourself And don't forget to repeat the experiment to reduce random errors 1 Reply Link to post Share on other sites More sharing options...
alarab Posted December 27, 2010 Report Share Posted December 27, 2010 You know how in the portfolio you are supposed to find the co-ordinate points of buddy? Do you need to find angles in order to find the coordinate points?I've been able to find some coordinate points without finding any angles at all (by using similar triangles and Pythagorean theorem) but I've seen my friends talking about using angles and stuff. I know the portfolio instructions specifically says about buddy's change of angle but I didn't really need to find the angles for anything. That's why I'm kinda scared and have a feeling that I might be doing something wrong.Also, are we allowed to use a recursive formula generator to find the recursive formula?and any ideas on what kind of geometric software should be used?Thanks!Hey everyone!! I started this portfolio just today and I hope it's not too late but I didn't used angles, I used similarities and many more students in my class is using similarities so what I believe is that you should go for it and I'm stuck haha Reply Link to post Share on other sites More sharing options...
alexliang Posted January 1, 2011 Report Share Posted January 1, 2011 My teacher says, i need to know about interpolation stuff to solve problems afterward,,,,i have worked out recursive formula and determined how many steps are needed for Buddy and Angie to meet....Can somebody give me a hand, what should i do to continue? Reply Link to post Share on other sites More sharing options...
Ivan-Igor Posted January 12, 2011 Report Share Posted January 12, 2011 I am using excel to make recursive formulae but there are some focking stuff with the meeting pointI still do not know how to find it in excel(((And my lovely teacher is even more dissapointed than me! Reply Link to post Share on other sites More sharing options...
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