Question about Texas Instruments TI-83 Plus Calculator

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The calculator is only graphing a half circle when it should be a full circle, specifically not in the negative y-values of the plane.

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A circle is not a function and cannot be graphed in the regular y=screen. You can graph a circle in parametric mode.

To graph a circle in the regular y= screen, you have to graph it in 2 lines on the y= screen. I assume you've solved for y and gotten a square root equation. Remember a square root can be positive or negative. In line 1 of y= screen graph what you've been graphing and then graph the same equation in line 2 but with a negative in front of the equation. You'll get something that looks like an oval since the calculator screen is rectanglular. To make it look more circular (both parts aren't going to connect), press zoom and then select #5 (square).

Posted on Aug 06, 2009


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1 Answer


Use the DRAW program.
Press [2nd][PRGM] (DRAW)
Select [9:Circle (]
Command echoes on main screen
Complete the command with coordinates of the center and the radiius
Close parenthesis and press [ENTER]
The circle is displayed.

Ex: Circle(0,3,2) draw a circle with cntere at (0,3) and radius equal to 2.

Alternatively: If the conics application is on the calculator run it.
Press [APPS]
Select [Conics]
Select [1:CIRCLE]
Choose the canonical form (X-H)^2 + (Y-K)^2=R^2 where H, and K are the coordinates of the center and R is the radius.
You will be prompted to enter the values for H,K, and R

You can also use the general equation for a circle aX^2 +aY^2+BX+CY +D=0
Enter the values of a, B, C and D.Change the values to get what you want.

Apr 01, 2010 | Texas Instruments TI-83 Plus Calculator

1 Answer

Some y values in my table say error when i graph logs

That is normal behavior. The log functions are not defined if the argument (x value ) is negative.

Mar 23, 2010 | Texas Instruments TI-83 Plus Calculator

1 Answer

Problems seeing graph on calculator....think it has something to do with limits set on window....what do I do

I take your word for it. If graph is out of range you should zoom out.
But first try [ZOOM][6:Ztandard]. If you still see nothing, press [WNIDOW] and set XMIN=-100, XMAX=100, YMIN=-100, YMAX=100.
Otherwise you must know a few things about the behavior of the function you try to hraph
1. If X is always positif, set XMIN=0
2.If X is always negative, set XMAX=0
3. If Y has only positive values, set YMIN=0
4. If Y has only negative values, set YMAX=0

You can also calculate Y for X=0. Let Y(0) be that value. Then you try to have the Y-Values centerd around it: YMIN=Y(0)-10 and YMAX=Y(0)+10.

Hope it helps.

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1 Answer

I can't find how to graph absolute value function.

Here how you do it taking as exemples y1=x^3 -5 and y2=abs(x^3-5)
Turn calculator ON by pressing [AC/On] . Use arrows to select [Graph] icon and press [EXE]
On line Y1= enter X[^]3 -5 [EXE]
On line Y2= press [OPTN] [F5:NUM][F1:abs] [(] X [^]3 -5 [)] [EXE]
The graphs will be drawn one after the other. You might have to adjust the window limits.
Here is an ouput drawn on another calculator.
For negative values of the x-variable, Y1 has negative values, while in the same range, Y2 has positive values, equal and opposite to those of Y1. In that range, Y1 and Y2 are symetric of each other with respect to the X axis.
For positive values of the x-variable, Y1 and Y2 are identical.

Hope it helps

Jan 30, 2009 | Casio CFX-9850G Plus Calculator

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