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Author Topic: x=5; x>4  (Read 11141 times)

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Offline Munchor

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x=5; x>4
« on: November 09, 2010, 04:55:15 pm »
Hey there,

I'm doing Cartesian graphics at school and both my calcs (84 and NSpire) can't do the following:

x>4

x=3y

They can only do:

f1(x)=4
(which is the same than:)
y=4

y=7x^2

So, is there a way to change it or any other graphics program that can deal with x as an independent variable?
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Offline Xeda112358

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Re: x=5; x>4
« Reply #1 on: November 09, 2010, 04:58:11 pm »
If you can make Y in terms of X you should be fine. For the X>4, I don't know what to say. I don't own an Nspire; does it have a DrawInv equivalent?
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Offline yunhua98

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Re: x=5; x>4
« Reply #2 on: November 09, 2010, 04:58:59 pm »
if you install Inequalz, you should be able to activate x=, and as for x=3y, change that to y=x/3.  ;)
also, for x>4, you can move the cursor to the slanted line next to the "Y=" on the screen.  press that until you get "/" with the top part shaded, that is equivalent to ">"  press it until you get "/" with the bottom shaded, that is "<".
« Last Edit: November 09, 2010, 05:00:55 pm by yunhua98 »
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Offline Munchor

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Re: x=5; x>4
« Reply #3 on: November 09, 2010, 05:04:17 pm »
Quote from: yunhua98 on November 09, 2010, 04:58:59 pm
if you install Inequalz, you should be able to activate x=, and as for x=3y, change that to y=x/3.  ;)
also, for x>4, you can move the cursor to the slanted line next to the "Y=" on the screen.  press that until you get "/" with the top part shaded, that is equivalent to ">"  press it until you get "/" with the bottom shaded, that is "<".

Okay...

Can I rate that post up?

I WILL do so, thanks much Inequal installed, very good working, perfect!
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Offline AngelFish

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Re: x=5; x>4
« Reply #4 on: November 09, 2010, 05:54:16 pm »
Quote from: Xeda112358 on November 09, 2010, 04:58:11 pm
If you can make Y in terms of X you should be fine. For the X>4, I don't know what to say. I don't own an Nspire; does it have a DrawInv equivalent?

Yep. The DrawInv command is included with the 84+ series.
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Offline MRide

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Re: x=5; x>4
« Reply #5 on: November 09, 2010, 06:18:23 pm »
Also, you can acheive the same thing with parametric equations.  Put T in for Y=, and your equation in for X=.
If I am mistaken, please let me know. :)
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Offline FinaleTI

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Re: x=5; x>4
« Reply #6 on: November 09, 2010, 06:39:46 pm »
While we're giving graphing tips, if you want to graph a piece-wise function, enclose the parameters in curly braces, and then the equation in curly braces.
Example:
Y={X>2 and X<7}{X2}

This will graph X2 from 3 to 6. I found this helpful earlier this year in Pre-Calc.
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Offline MRide

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Re: x=5; x>4
« Reply #7 on: November 09, 2010, 06:42:19 pm »
Shouldn't that just be parentheses?
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Offline AngelFish

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Re: x=5; x>4
« Reply #8 on: November 09, 2010, 06:44:15 pm »
I've been wondering how to do piecewise functions for a long time. Thanks.

EDIT: Mride, nope. Parentheses designate an expression. Curly brackets designate something else.
« Last Edit: November 09, 2010, 06:45:02 pm by Qwerty.55 »
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Offline Deep Toaster

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Re: x=5; x>4
« Reply #9 on: November 09, 2010, 06:45:31 pm »
They should be parentheses. Braces are for families of functions.

EDIT: Ninja'd by

Quote from: Qwerty.55 on November 09, 2010, 06:44:15 pm
I've been wondering how to do piecewise functions for a long time. Thanks.

EDIT: Mride, nope. Parentheses designate an expression. Curly brackets designate something else.

What calc is this for?
« Last Edit: November 09, 2010, 06:46:13 pm by Deep Thought »
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Offline FinaleTI

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Re: x=5; x>4
« Reply #10 on: November 09, 2010, 06:47:36 pm »
Nope, curly braces.
Screenie:

Edit: This is for the 83+/84+ calcs.
« Last Edit: November 09, 2010, 06:48:03 pm by FinaleTI »
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Offline Munchor

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Re: x=5; x>4
« Reply #11 on: November 09, 2010, 06:49:48 pm »
Quote from: FinaleTI on November 09, 2010, 06:47:36 pm
Nope, curly braces.
Screenie:

Edit: This is for the 83+/84+ calcs.

Works too, great!
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Offline Deep Toaster

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Re: x=5; x>4
« Reply #12 on: November 09, 2010, 06:51:07 pm »
I think they're just multiplying the families together. It also works with parentheses or even multiplication (so Y1=(X<2 and X>7)(X2) would also work). Braces are used to graph a family of functions, like Y1=X^{1,2,3,4,5}.
« Last Edit: November 09, 2010, 06:52:37 pm by Deep Thought »
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Offline meishe91

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Re: x=5; x>4
« Reply #13 on: November 09, 2010, 06:56:58 pm »
Well I don't know about the curly bracket thing really but it does work with regular parentheses the same way, I mean all it's doing is making everything equal zero unless it's within those bounds, which both accomplish.
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Offline Deep Toaster

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Re: x=5; x>4
« Reply #14 on: November 09, 2010, 06:57:47 pm »
I'm pretty sure it's even slower with braces, since it has to convert them into lists before graphing them as families of functions.
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