Question about Texas Instruments TI-84 Plus Calculator

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Window settings TI 84

How do I find appropriate window settings when I am graphing a fourth or fifth degree polynomial. Right now I am doing it by trial and error, but that takes too long.

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Unfortunately there is no single "correct" set of window parameters. It depends on the particular polynomial.

Consider this: after you get a good plot of a polynomial, try plotting another polynomial derived by dividing all of the coefficients by a million. If you plot it using the same settings, the graph will be indistinguishable from the X-axis.

Posted on Feb 03, 2010

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2 Answers

Graphing sine


Can you define what you mean by a "diagonal sine function"?

May 10, 2013 | Office Equipment & Supplies

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How to graph 5th degree polynomial TI 84


The TI-84 does not have a built-in quintic fit.

The most common scheme for fitting a model to data is the least squares. You'll find several programs to calculate this here.

May 24, 2012 | Texas Instruments TI-84 Plus Calculator

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Sine graph is straight


If the angle unit is set to degrees and you use the standard window dimensions (Xmin=-10, Xmax=10) then all you will see is a straight line: Between 0 and 10 degrees, the sine is approximately equal to 0 and the cosine is about 1.

To see the features of the trigonometric functions you must do one of the following
  1. Set angle to degree but set window dimensions to span the domain -180 to 180 or larger.
  2. Set windows dimensions to the standard -10, 10 range but set angle degree to radians

May 12, 2012 | Texas Instruments TI-84 Plus Calculator

1 Answer

How to solve polynomials


That depends on the order of the polynomial. If the polynomial is of second order, the quadratic formula will give you its roots. There are similar formulae for third, fourth, and fifth order polynomials, and it has been proven that no such formulae exist for higher-order polynomials.
Some TI calculators have a numerical solver which can produce numerical solutions to arbitrary polynomials. Since you declined to specify the model of your calculator, I'm afraid I can't tell you whether yours has one or not.
If you need further assistance, please reply to this post and be sure to specify the model of your calculator.

Feb 12, 2012 | Texas Instruments Office Equipment &...

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I graphed Y=tan(x) on two TI-84 calculators and they're both wrong! one shows a straight diagonal graph, and the other looks similar to an ordinary tangent graph but it's wrong!


Check the angle unit. If Angle unit is set to degree and window is about (-10,10) for X and (-10,10) for Y, you get a straight line. See screen capture.
k24674_88.jpg

Use radians. Or if you use degrees, set Xmin about -180 and XMax about180

With radian units the graph looks as follows.
k24674_89.jpg
Check the calculator configuration.

Jun 10, 2011 | Texas Instruments TI-84 Plus Calculator

1 Answer

How can I graph sine and cosine waves on my TI-84 Plus? I can see the Theta symbol on the "X,T, "Theta",n" button. But whenever I try to graph a function, it doesn't work. Please...


When you graph functions y=f(x), even if f(x) is a trigonometric function, the default independent variable is x. You will have to use the variable theta only when drawing polar functions.
To draw the sine and cosine or any other trigonometric function set the angle unit to radians and window zoom to standard. If your angle unit is degree you must modify the x-window range to, say, multiples of 180 degrees. Other than that there is nothing special to do. The functions are well-behaved and should graph nicely. You will alos get a better view if Ymin is about -1.2 and Ymax is about 1.2

May 22, 2011 | Texas Instruments TI-84 Plus Calculator

1 Answer

Not graphing sin(x)


Make sure you're angular mode is set to radians, not degrees. With the default window range, sin(x) in degrees is virtually indistinguishable from zero.

To change the angular mode, press MODE, down-arrow twice, left/right-arrow to highlight Radian, ENTER to set it, and 2ND [QUIT] to exit.

Sep 24, 2010 | Texas Instruments TI-84 Plus Calculator

1 Answer

I cant highlight both equations in Y= to graph


Hello,

First thing to do before any new type of problem
1. Turn StatPlots OFF : press [2nd][STATPLOT][4:PlotsOff] [ENTER]

Second thing: Clear the statistical lists
2. Press [2nd][0][PGRM] DownArrow to point to ClrAllLists.
3.Press [ENTER][ENTER]

Third thing : Configure the graph type to be FUNCTION graph
4. Press [MODE]. If FUNC (on fourth line) is highlighted. Press [Y=] and start entering the functions.
5. If FUNC is not highlighted, use Down arrow till 4th line, highlight FUNC and press [ENTER]. Press Press [Y=] and start entering the functions.

Fourth thing: Enter function and select them for graphing
1. As you start entering the function Y1=, notice that the = sign becomes highlighted. Press [ENTER] when Y1 is typed in. Make sure the = sign for Y1 remains highlighted as cursor moves to Y2=.
2. Keep entering the functions and verifying that their = signs remain highlighted as cursor moves to another equation.
3. When finished press [ENTER]
4. Look at the graph style for each function: it is a bit of line to the left of each Y. Here is a picture of all the 7 styles.

5d53e23.jpg

To set a graph style, highlight the style to the left of the Y, and press [ENTER]. Each time you press [ENTER] you see a new style, in the order shown on picture.
Avoid the style of Y6, it is bubble, and as such will burst and disappear once graph is finished. Avoid also the triangular ones (for Y3 and Y4) they will shade areas of the graph, and may hide other functions.

Fifth thing: Graph Functions.
1. You can press [GRAPH] to see your graphs.
2. If one curve is missing (and you have not set its style to be rhe bubble), it may be due to the Window dimensions.

Sixth Thing: Set Window dimensions and Zoom.
1. Press [ZOOM][6:ZStandard] to use standard window dimensions.
2. If curve still missing, Press [ZOOM][3:Zoom Out] to zoom out so that you may be able to see a bigger range for the functions.
3. If necessary press [WINDOW] and set the Xmin, Xmax, Ymin,Ymax to values of your own.

d44f2dd.jpg

Dimensions must obey the conditions: Xmin < Xmax, and Ymin < Ymax.

Hope that helps.

Nov 09, 2009 | Texas Instruments TI-84 Plus Calculator

1 Answer

I can't graph two functions at the same time (in y=) on a TI-84 Silver Edition. Can you help fix that?


Hello,
You bet I do, provided
1. there are no hardware problems I am not aware of;
2. that you are willing to follow my instructions.

First thing to do before any new type of problem
1. Turn StatPlots OFF : press [2nd][STATPLOT][4:PlotsOff] [ENTER]

Second thing: Clear the statistical lists
2. Press [2nd][0][PGRM] DownArrow to point to ClrAllLists.
3.Press [ENTER][ENTER]

Third thing : Configure the graph type to be FUNCTION graph
4. Press [MODE]. If FUNC (on fourth line) is highlighted. Press [Y=] and start entering the functions.
5. If FUNC is not highlighted, use Down arrow till 4th line, highlight FUNC and press [ENTER]. Press Press [Y=] and start entering the functions.

Fourth thing: Enter function and select them for graphing
1. As you start entering the function Y1=, notice that the = sign becomes highlighted. Press [ENTER] when Y1 is typed in. Make sure the = sign for Y1 remains highlighted as cursor moves to Y2=.
2. Keep entering the functions and verifying that their = signs remain highlighted as cursor moves to another equation.
3. When finished press [ENTER]
4. Look at the graph style for each function: it is a bit of line to the left of each Y. Here is a picture of all the 7 styles.

5d53e23.jpg

To set a graph style, highlight the style to the left of the Y, and press [ENTER]. Each time you press [ENTER] you see a new style, in the order shown on picture.
Avoid the style of Y6, it is bubble, and as such will burst and disappear once graph is finished. Avoid also the triangular ones (for Y3 and Y4) they will shade areas of the graph, and may hide other functions.

Fifth thing: Graph Functions.
1. You can press [GRAPH] to see your graphs.
2. If one curve is missing (and you have not set its style to be rhe bubble), it may be due to the Window dimensions.

Sixth Thing: Set Window dimensions and Zoom.
1. Press [ZOOM][6:ZStandard] to use standard window dimensions.
2. If curve still missing, Press [ZOOM][3:Zoom Out] to zoom out so that you may be able to see a bigger range for the functions.
3. If necessary press [WINDOW] and set the Xmin, Xmax, Ymin,Ymax to values of your own.

d44f2dd.jpg

Dimensions must obey the conditions: Xmin < Xmax, and Ymin < Ymax.

Hope that helps.



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Oct 29, 2009 | Texas Instruments TI-84 Plus Silver...

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