Vertical line conditions

[Michael Meadows]

Is it possible to make a vertical line with conditions? 

Something like:

x = 3 | y < 2

Thanks, 

Michael

"The only reason for time is so that everything doesn't happen at once.” - Albert Einstein

∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞

Michael Meadows

Lake Forest High School

Chair, Mathematics Department

Math League Advisor

mdme...@lf.k12.de.us

302.284.9291 x273

∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞

[Dennis Donovan]

I'm not sure exactly what your trying to do, but I've attached a file that conditionally shows a vertical line x=3 when the y-coordinate of a point P is less than 2.

New with 3.2 are conditional display of objects and conditional color of objects (line and fill color).  Also, the conditions box is the place to change text color on a Graphs and Geometry page (see below).

In this file,   (note, I'm a right clicker! But everything on the right click menu can be found on the Menu as well)

1. I constructed the line x=3 (there are a couple of ways to do this, I find the easiest is to create a text box and type x=3, then drag the text box to the axes and the graph appears)

2. I created point P (Menu->Geometry->Points& Lines->Point) Label it P and show the Coordinates (right click)

3. I stored the y-coordinate as "yc" (right click->Store)

4. I right clicked on the line and selected conditions (also can be found as Menu->Actions->Set Conditions).  Since I only want the line to be visible when the y-coordinate of P is less than 2, I typed yc<2 in the "Show When" field on the conditions pop-up box.

Another neat thing you can do with conditions is to change color conditionally.  On the same page there is a line at x=-2, this line is set to change color when the y-coordinate of P is less than 2 (Green) or greater than or equal to 2 (Blue).

This is achieved by right clicking on the line and selecting conditions.  For this line I always want it visible, so I leave the "Show When" field blank, but I want the line color to differ conditionally.  So I type "when(yc<2,4,2)" into the Line color field.  When the condition (yc<2) is true, then the line will be color 4 (green) and when it is false, the line will be color 2 (Blue).  You can see a list of the color numbers from the conditions pop-up box by clicking "Colors".

Note: if all you want is the color of the text to be different than black, you have to change it in the conditions box.  Simply type the color number alone in the Line color or Fill Color fields, with no conditional statement around it.  For example if you want the text to always be Blue, then right click on the text box and type 2 in the Line color field.

Hope that helps.

Dennis Donovan

---

From: Michael Meadows <mdme...@lf.k12.de.us>
To: "tins...@googlegroups.com" <tins...@googlegroups.com>
Sent: Friday, August 3, 2012 11:38 AM
Subject: [tinspire] Vertical line conditions

--
To post to this group, send email to tins...@googlegroups.com
To unsubscribe send email to tinspire+u...@googlegroups.com
For more options, visit this group at
http://groups.google.com.au/group/tinspire?hl=en-GB?hl=en-GB
The tns documents shared by group members are archived at
https://sites.google.com/site/tinspiregroup/classroom-news/welcome-abouttime

[Sean Bird]

I think you are looking for this

Type what you wrote in a text box and drag it to an axes.
It converts in into a piecewise template for you.

Blessings,
Sean Bird

[Kim]

I just had a student ask me if we could restrict a vertical line like restricting a horizontal line when I was showing the student a few of the new features of 3.2

I tried writing the statement (x=3|y>0) in the graph line after selecting the vertical line template, but an error shows up."Coefficients must evaluate to numeric values."

Sean's suggestion of typing the statement of typing in the the equation (like x=-3|y>0) then draging the text box to an axis seems to be the only way to get the restricted vertical line to graph.

Question/Observation
When you type in a statement to be graphed (any function or vertical line) and you drag it to an axis, that statement is then graphed.  BUT as far as I can tell that statement is not in the list of functions in that you can edit or observe int he graph line at the bottom that you open up by either pressing tab or control G.  Is this intended? Has it always been this way?

[Sean Bird]

The text getting graphed when it is dragged has been around for several years, but its capabilities were recently greatly increased with x=, x<, x>, etc.

Currently the limiting the range (or domain for that matter) cannot be done from the equation options. The graph 'type' of Equation allows for only certain graphs where the coefficients must be provided and nothing else. This enables the students to explore by grabbing these graphs in certain ways, e.g. the vertex or center. 

I'm hoping that in the future the entry line functionality will be expanded. But this is how it is now.

My favorite thing to graph by inserting text is x=f1(y)

I love how it is dynamic.

I'm uploading a video on YouTube to show a bit of this. 

http://www.youtube.com/user/covenantbird/videos

- Sean Bird

Covenant Christian High School

Indianapolis, IN

Psalm 111:2 "Great are the works of the Lord, studied by all who delight in them."

[John Hanna]

Here’s a weird one…

 

Insert Question type Equation (y=)

    allow the option to display the graph.

 

Start with the equation y=x^2

Now go to the graph and hover to see the name of the graph!

 

I see a question (attached, p 2.4) in which the graph would not move nicely. Am I in the twilight zone?

 

Remember the Alamo,

     John Hanna

     jeh...@optonline.net

     www.johnhanna.us

     T³ - Teachers Teaching with Technology

     "the future isn't what it used to be."

 

[Sean Bird]

I'll attribute to the fact that you are using the Teacher Software. When a question like this is on the handheld the student cannot interact with the graph. They can only enter their equation in the question. When the teacher is creating the question they have more control and functionality than the student will when it is sent to them.

--

[John Hanna]

Ahhh.. Thanks, Sean-san!

 

     John Hanna

     jeh...@optonline.net

     www.johnhanna.us

     T³ - Teachers Teaching with Technology

     "the future isn't what it used to be."

 

[Michael Meadows]

Ahh, comma. No pipe. It didn't like that.

"Intellectual growth should commence at birth and cease only at death.” - Albert Einstein

∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞

Michael Meadows

Lake Forest High School

Chair, Mathematics Department

Math League Advisor

mdme...@lf.k12.de.us

302.284.9291 x273

∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞

[Michael Meadows]

Strike my last email.. I see now. Seems a pain, but it'll do.

"The only reason for time is so that everything doesn't happen at once.” - Albert Einstein

∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞

Michael Meadows

Lake Forest High School

Chair, Mathematics Department

Math League Advisor

mdme...@lf.k12.de.us

302.284.9291 x273

∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞

On Aug 4, 2012, at 9:41 PM, Michael Meadows <mdme...@lf.k12.de.us>

 wrote:

[Sean Bird]

The specific video demonstrating this is  https://www.youtube.com/watch?v=L70AdF5OrQY 

I did the example  x=-4|y<2