Off topic but ......

[Joe]

I can go to the Promethean planet technology in math education site
that Rex started and log in and I can read the discussions but how in
the world do I post a reply??? I can't find anything to click on that
provides an area for composing and posting replies to the discussion
messages. Can anyone here help? Maybe Rex? This is strange and
maybe a cause of so few discussions there.

[Bob Mathews]

You have to be registered and signed in to post or reply. Did you sign in?

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[Joe]

Yes I did. When reading a message on a discussion, I can't find
anything to click on to make a reply. What should I be looking for?

[Bob Mathews]

I'll try to post a screen shot inline, but I'll also attach it in case it doesn't come through. When I go to http://community.prometheanplanet.com/en/user_groups/mathematics/default.aspx and log in, and read any of the posts, I see a reply button in the lower right corner:

[Ltan Honorsmiter]

Odd, I see the reply button in the screen shot that you posted below...

On 2/4/2012 9:23 PM, Bob Mathews wrote:

I'll try to post a screen shot inline, but I'll also attach it in case it doesn't come through. When I go to http://community.prometheanplanet.com/en/user_groups/mathematics/default.aspx and log in, and read any of the posts, I see a reply button in the lower right corner:

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[Joe]

Thanks for the help.

On Feb 4, 6:26 pm, Ltan Honorsmiter <ltanhonorsmi...@gmail.com> wrote:
> Odd, I see the reply button in the screen shot that you posted below...

> On 2/4/2012 9:23 PM, Bob Mathews wrote:I'll try to post a screen shot inline, but I'll also attach it in case it doesn't come through. When I go tohttp://community.prometheanplanet.com/en/user_groups/mathematics/default.aspxand log in, and read any of the posts, I see a reply button in the lower right corner:
>
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[alcoonslists]

[Travis Bower]

Al,

You might pick up some tidbits searching this site

'polar' etc.

I think I wrote some things in lemniscate figure eight
search for it.  

It was something about re-setting.  I have numeric.

Hope that helps, maybe.

On Sun, Feb 5, 2012 at 7:55 AM, alcoonslists <alcoon...@verizon.net> wrote:

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My colleague tried to do use the Parametric Graphing with Trail  program in degrees and all hell broke loose.  I thought it was not changing some of the limits correctly until I started really looking into what was going on.  

Take a look at the attached document:

1) It should already be set in degrees.  

2) Take a look at the definition of X1 and y1.  Note that 0<t<3.14.

3)  Take a look at the resulting graph.

As best I can tell, the domain restriction and tstep are in radians even when the calculator is set to radian mode.

Am I missing something (of course I am, but I a mean in reference to this problem), or is this a bug, a feature, or ??

Thanks,

Al

-------------------------

Albert Coons

al_c...@bbns.org

Buckingham Browne & Nichols School

Gerry's Landing Road

Cambridge, MA 02138

(617) 800-2264

AP Statistics Web Site:  www.bbn-school.org/us/math/ap_stats

[alcoonslists]

Thanks Travis.

Did the search and found something, but I think that has more to do with setting the step rather than the units of the domain.  Clearly if the step is too large you get "thick functions" or even apparently random segments across closed graphs (sounds like chaos to me).

Can someone confirm that I was doing the right thing in the document I attached to my last email?

Thanks,

Al

[Dennis Donovan]

Al,

When I looked at the document, the general setting for angle was in degrees, but the graphing angle was still in radians.

I don't see "all hell breaking loose" in this document.  When the Graph angle is set to radians and 0<=t<=3.14 with tstep=0.13 I see a semi circle.  When the Graph angle is set to degrees, before I reset the t parameter, I saw a few points representing 3.14 degrees of arc, then I set 0<=t<=180 with tstep=10, I see a semi circle.

I'm not sure what you are expecting: Do you want what the TI-84 Zoom Trig does?  i.e. sets the window as [-360,360] or [-6.26,6.28] and changes the T values for degrees or radians as appropriate.

It appears that the Zoom and Window menu items only control x and y mins and maxs and have nothing to do with the non function mode parameters.

Also, I went back and looked at Parametric Friend with tail (your doc with the three elliptical arcs) and changed the graph angle to degrees and then dragged the tt slider and I saw about a 12.56 degree of arc (for all three ellipses) at the maximum tt value.

Dennis Donovan

Xaverian Brothers HS

Westwood, MA

---

From: alcoonslists <alcoon...@verizon.net>
To: tins...@googlegroups.com
Sent: Sunday, February 5, 2012 2:28 PM
Subject: Re: [tinspire] Parametic Graphing Problem in Degrees?

[alcoonslists]

DAH!

Looks like I never caught on the the graph setting was separate for units.  Never had to deal with it before, but will soon.  Thanks so much.

Al

PS.  I eliminated the "all hell breaking loose part" so I could just focus on units.

[Travis Bower]

someone wrote about 'settings' as well.

More control vs. complexity.  I sometimes get annoyed, but that's due to my weak grasp.

Angle settings for:

Scratchpad, General, Graphing, Geometry.

Here's my make lemon/lemonade-twist I impart to students:  make sure your answer is reasonable, and this comes with experience and making mistakes.