UBC Wiki - User contributions [en]

Thread:User talk:BenJeffery/Comments on your Calculus Essay

2011-02-02T07:55:33Z

JingFeiYu: New thread: Comments on your Calculus Essay

Hi Ben,

I would appreciate it if you take a little more time to finish your essay. I'm sure you can research something up. Perhaps elaborate on lambada calculus?

Thread:User talk:ChristaBicego/Comments to Calculus Essay

2011-02-02T07:51:59Z

JingFeiYu: New thread: Comments to Calculus Essay

Hi Christa,

Your essay is a little short, and you only talked about math in general, especially graphs and numbers. But can you give some details about how ''calculus'' is used? (a quick example: population growth)

User talk:UnaVuckovic/Homework 12

2011-02-02T07:44:15Z

JingFeiYu: Talk page autocreated when first thread was posted.

Thread:User talk:UnaVuckovic/Homework 12/Comments

2011-02-02T07:44:14Z

JingFeiYu: New thread: Comments

Hi Una,

All of the things you talked about in your essay is very interesting, but you are only talking about the use of functions. Can you think of any situations where calculus is used? You've talked about the speed, rotations of the football, can you research into the physics equations and write about how calculus is used there?

Thread:User talk:Fiona/Comments on Calculus Essay

2011-02-02T07:41:50Z

JingFeiYu: New thread: Comments on Calculus Essay

Hi Fiona,

Your essay is a little short of 500 words. Can you elaborate more on how calculus is used in economics? Perhaps go more into details for marginal costs, elasticity etc.

Thread:User talk:RaphaelTan/Comments on Essay about Calculus

2011-02-02T07:34:05Z

JingFeiYu: New thread: Comments on Essay about Calculus

Hi Raphael,

Your essay is short of 500 words, can you elaborate a little more on your points about calculus in business, rather than just referring to one video?

Thread:User talk:JoseTorresTorija/Comments for Your Essay on Calculus

2011-02-02T07:18:56Z

JingFeiYu: New thread: Comments for Your Essay on Calculus

Hi Jose,

Just a note: use of numbers is not the same as use of calculus (one does not necessarily equate another), can you be more specific on how calculus is used in your field of studies?

User talk:CharlyHuxford/Intersting Use of Calculus

2011-02-02T07:09:35Z

JingFeiYu: Talk page autocreated when first thread was posted.

Thread:User talk:CharlyHuxford/Intersting Use of Calculus/Comments on the Essay

2011-02-02T07:09:35Z

JingFeiYu: New thread: Comments on the Essay

Hi, I just have a quick comment on your essay: while the golden ratio is all very interesting, can you relate it to Calculus in some way? Or perhaps choose another scenario where Calculus is used?

Thread:Course talk:MATH110/003/Teams/Uri/Homework/12 Part3/Comments/reply (2)

2011-02-02T06:51:49Z

JingFeiYu: Reply to Comments

Great! Good job! Though it's past the deadline so I can't do much about the marks, but try to read the entire question next time! :)

Thread:Course talk:MATH110/003/Teams/St Gallen/Homework 12/Comments

2011-02-02T05:33:41Z

JingFeiYu:

Hi guys, I don't have too much to complain about this. Good work!

Thread:Course talk:MATH110/003/Teams/Ticino/Homework 12/Comments

2011-02-02T05:32:37Z

JingFeiYu:

Hi guys, here are a few comments:

1) Can you write more about the model? Can you plug in some numbers (but not just random ones! reasonable ones and you should be able to justify the "reasonableness") and make a prediction?

Thread:Course talk:MATH110/003/Teams/Zurich/Homework 12/Comments

2011-02-02T05:30:20Z

JingFeiYu: New thread: Comments

Hi guys, I don't have much to say except echo David's point: what other assumptions do you need for your model? is it realistic??

Course talk:MATH110/003/Teams/Zug/Homework 12

2011-02-02T05:27:22Z

JingFeiYu: Talk page autocreated when first thread was posted.

Thread:Course talk:MATH110/003/Teams/Zug/Homework 12/Comments

2011-02-02T05:27:22Z

JingFeiYu: New thread: Comments

Hi guys, just a quick point: is the y-intercept always half of K? What's the y-intercept if I slide the function over, say, to the right? What modification can result in that change?

Course talk:MATH110/003/Teams/Vaud/Homework 12

2011-02-02T05:24:24Z

JingFeiYu: Talk page autocreated when first thread was posted.

Thread:Course talk:MATH110/003/Teams/Vaud/homework12/Comments

2011-02-02T05:24:24Z

JingFeiYu: New thread: Comments

Hi guys, I just would like to point out one problem: is the y-intercept always half of K? What would the y-intercept be if I slide the function to, say, the right? What parameter can you change to achieve that?

Course talk:MATH110/003/Teams/Valais/Homework 12

2011-02-02T05:22:27Z

JingFeiYu: Talk page autocreated when first thread was posted.

Thread:Course talk:MATH110/003/Teams/Valais/Homework 12/Comments

2011-02-02T05:22:27Z

JingFeiYu: New thread: Comments

Hi guys, you are missing quite a bit of the work! Can you try to find out how to modify the function to change its y-intercept, and use this function as a real-life model to do some predictions? Look at the question again!

Also, you didn't really specify what k is in the last paragraph, though it is specified in the question, it's better to include an entry explaining your variables to make your work more readable!

Course talk:MATH110/003/Teams/Uri/Homework/12 Part3

2011-02-02T05:20:08Z

JingFeiYu: Talk page autocreated when first thread was posted.

Thread:Course talk:MATH110/003/Teams/Uri/Homework/12 Part3/Comments

2011-02-02T05:20:08Z

JingFeiYu: New thread: Comments

Hi guys, I just have one point: Can you use your model to make some concrete predictions? This part is present in the question so I guess you might have just overlooked it!

Thread:Course talk:MATH110/003/Teams/Thurgau/Homework 12/Comments

2011-02-02T05:17:57Z

JingFeiYu:

Hi guys, did you forget about half of the problem? Can you use this function to model some real life problems and give a prediction? Check out other teams's pages for ideas!

Also, if I want a specific value, say 5 for the horizontal asymptote, and 3 for y-intercept, will you be able to produce it easily using your way? Try playing with the function again, just using coefficients rather than adding constants!

Thread:Course talk:MATH110/003/Teams/St Gallen/Homework 12/Comments

2011-02-02T05:16:23Z

JingFeiYu:

Hi guys, I just have one point:

If I want a specific asymptote, will you be able to produce it easily? Think again on how you could modify the function. Hint: change the numerator.

Thread:Course talk:MATH110/003/Teams/Schaffhausen/Homework 12/Comments

2011-02-02T05:13:30Z

JingFeiYu:

Hi guys, here are some comments for your work

1) For questions like this when a change of shape of the function is evident (in fact, required from the problem), it would be nice if you could provide some graphs showing how different modification led to the desired changes. It would be a great visual aid for your readers!

2)It would also be great if you can place some kind of separation between the problem given and your answers, use section headings or even a line to make your work more readable.

3)If I want a specific value for y-intercept, say K/3, but I want you to fix K, can you find out easily what is the change?

Thread:Course talk:MATH110/003/Teams/Ticino/Homework 12/Comments

2011-02-02T05:10:47Z

JingFeiYu: New thread: Comments

Hi guys, here are a few comments:

1) Like David says, sure your way changes the y intercept, but can you easily control it?

2) Can you write more about the model? Can you plug in some numbers (but not just random ones! reasonable ones and you should be able to justify the "reasonableness") and make a prediction?

Thread:Course talk:MATH110/003/Teams/Thurgau/Homework 12/Comments

2011-02-02T05:06:51Z

JingFeiYu: New thread: Comments

Hi guys, did you forget about half of the problem? Can you use this function to model some real life problems and give a prediction? Check out other teams's pages for ideas!

Course talk:MATH110/003/Teams/St Gallen/Homework 12

2011-02-02T05:04:18Z

JingFeiYu: Talk page autocreated when first thread was posted.

Thread:Course talk:MATH110/003/Teams/St Gallen/Homework 12/Comments

2011-02-02T05:04:18Z

JingFeiYu: New thread: Comments

Hi guys, I don't have much to complain about this work! Excellent job!

Course talk:MATH110/003/Teams/Solothurn/Homework 12

2011-02-02T05:02:28Z

JingFeiYu: Talk page autocreated when first thread was posted.

Thread:Course talk:MATH110/003/Teams/Solothurn/Homework 12/Comments

2011-02-02T05:02:28Z

JingFeiYu: New thread: Comments

Hi guys, here are some comments:

1) Can you provide some graphs to show how the modified coefficients result in the desired change? This would be a great visual aid for your readers!

2) Can you talk about how you picked those coefficient values for your model? where did those come from (or what they mean)?

Course talk:MATH110/003/Teams/Schwytz/Homework 12

2011-02-02T04:50:42Z

JingFeiYu: Talk page autocreated when first thread was posted.

Thread:Course talk:MATH110/003/Teams/Schwytz/Homework 12/Comments

2011-02-02T04:50:42Z

JingFeiYu: New thread: Comments

Hi guys, here are some comments for your homework:

1) When asked a question that involves directly the shape of the function, it would be nice if you can show graphs on how modifications on different coefficients results in the desired changes. It would be a great visual aid to your readers!

2) Your answer to the bonus question is not correct. Just try it out, see what happens? (in fact it raises the horizontal asymptote)

3) To keep your page clean, please purge it of extraneous stuff...for example, that last chunk of text copied from the homework page...

Course talk:MATH110/003/Teams/Schaffhausen/Homework 12

2011-02-02T04:44:58Z

JingFeiYu: Talk page autocreated when first thread was posted.

Thread:Course talk:MATH110/003/Teams/Schaffhausen/Homework 12/Comments

2011-02-02T04:44:58Z

JingFeiYu: New thread: Comments

Thread:Course talk:MATH110/003/Teams/Neuchatel/Homework 12/Comments

2011-02-02T04:40:27Z

JingFeiYu:

Hi guys, when we speak of "modification", it means adding/removing coefficients rather than changing the existing function. So your modifications were not correct as you changed the function entirely. It's like changing a house into an apartment when all we asked was to re-paint it. Can you, as an extra exercise, find out how you could change the coefficients to match the conditions imposed in the question?

Course talk:MATH110/003/Teams/Neuchatel/Homework 12

2011-02-02T04:39:12Z

JingFeiYu: Talk page autocreated when first thread was posted.

Thread:Course talk:MATH110/003/Teams/Neuchatel/Homework 12/Comments

2011-02-02T04:39:12Z

JingFeiYu: New thread: Comments

Hi guys, there are a few things you should be aware of when doing this kind of problem:

1) When we speak of "modification", it means adding/removing coefficients rather than changing the existing function. So your modifications were not correct as you changed the function entirely. It's like changing a house into an apartment when all we asked was to re-paint it.

2) The question also asked if you could produce a model and make some predictions. Did you overlook that part of the question?

Course talk:MATH110/003/Teams/Luzern/Homework 12

2011-02-02T04:35:20Z

JingFeiYu: Talk page autocreated when first thread was posted.

Thread:Course talk:MATH110/003/Teams/Luzern/Homework 12/Comments

2011-02-02T04:35:20Z

JingFeiYu: New thread: Comments

Hi guys, here are some comments:

1) Perhaps include some graphs showing how the modification of different coefficients affect the shape of the model? It would be an excellent visual aid for your readers.

2) Can you explain why you've chosen your values for these coefficients in your model?

Course talk:MATH110/003/Teams/Jura/Homework/12 Part3

2011-02-02T04:30:25Z

JingFeiYu: Talk page autocreated when first thread was posted.

Thread:Course talk:MATH110/003/Teams/Jura/Homework/12 Part3/Comments

2011-02-02T04:30:24Z

JingFeiYu: New thread: Comments

Excellent Job guys! I don't have too much to complain, except perhaps if you could calculate out an exact number as your prediction? It would have helped you as sometimes (though not in this case as the asymptote is controlled by K) graphs are not very reliable for judging values by eye.

Course talk:MATH110/003/Teams/Graubunden/Homework 12

2011-02-02T04:22:58Z

JingFeiYu: Talk page autocreated when first thread was posted.

Thread:Course talk:MATH110/003/Teams/Graubunden/Homework 12/Comments

2011-02-02T04:22:58Z

JingFeiYu: New thread: Comments

Hi guys, here are some comments for your homework

1)Is y-intercept always 1/2 of the value of K? But what happens if you move the function horizontally? How do you do that?

2)Can you explain where your values for the coefficients in the model come from?

Course talk:MATH110/003/Teams/Geneve/Homework 12

2011-02-02T04:05:41Z

JingFeiYu: Talk page autocreated when first thread was posted.

Thread:Course talk:MATH110/003/Teams/Geneve/Homework 12/Comments

2011-02-02T04:05:41Z

JingFeiYu: New thread: Comments

Hi guys, here are some comments for your homework

1) Excellent work on finding out how to modify the function, but where is your model? What values would you pick for the coefficients, and what prediction can you make? You should describe a specific situation!!

Thread:Course talk:MATH110/003/Teams/Basel/homework 12/Comments for Homework 12

2011-02-02T04:04:21Z

JingFeiYu:

Hi guys, here are some comments:

1.) Your graph showed a whole bunch of different curves, but the legend has variables named <math>\mu</math> and <math>\beta</math>. What are those?

2.)Can you not change the y-intercept? think about moving the entire curve along the x-axis..

3.)Can you make a prediction using your model for the population of rabbits? So far you've only calculated how long it would take to get to 38 rabbits...

Course talk:MATH110/003/Teams/Basel/homework 12

2011-02-02T04:01:01Z

JingFeiYu: Talk page autocreated when first thread was posted.

Thread:Course talk:MATH110/003/Teams/Basel/homework 12/Comments for Homework 12

2011-02-02T04:01:01Z

JingFeiYu: New thread: Comments for Homework 12

Hi guys, here are some comments:

1.) Your graph showed a whole bunch of different curves, but the legend has variables named <math>\mu</math> and <math>\beta</math>. What are those?

2.)Can you make a prediction using your model for the population of rabbits? So far you've only calculated how long it would take to get to 38 rabbits...

Course talk:MATH110/003/Teams/Aargau/Homework 12

2011-02-02T03:52:14Z

JingFeiYu: Talk page autocreated when first thread was posted.

Thread:Course talk:MATH110/003/Teams/Aargau/Homework 12/Comments

2011-02-02T03:52:14Z

JingFeiYu: New thread: Comments

Hi guys, here are some comments about your team work:

1. It would be better if you can use some headings to separate different parts of your work. The graphs seem to be unattached to the answers located at the beginning. Perhaps show the graphs for different modifications at the appropriate place where you are actually talking about the particular modifications?

2. Can you explain how you decided to use these values for the parameters? Why 3*exp(-t), for example?