When you press 2nd graph the table should show the x and y1 coordinates, but I deleted the y1 when trying to clear the column and now I have no y coordinates. How do I get the y1 column back?

You need to define a function before you get anything in the ytable. The x-value are there by default.

After you enter the data draw the SCATTER plot first.
When you perform the (linear) regression analysis LineReg, save the regression equation to a function, for example Y1
The syntax is
LineReg L1, L2, Y1 ENTER


From the Stat>CALC menu press LineReg
The command echoes on command line
Press [2nd][1] to enter the L1 list on command line
Press [,] to separate
Press [2nd] [2] to enter L2 on the command line
Press [,] the comma again
Press [VARS][>][Y-Vars][1~Function][1:Y1] [ENTER]
Press [GRAPH] to have the regression line equation drawn
on the same screen as the Scatter Plot you drew before.

try this one:


(first). Set up a function in the TI85. how?
Step 1. Press the [Y=] key to open the function editor.
Step 2. Type in the function you want in the Y1= line.
Step 3. Press [2nd] [QUIT].

(second). Create a table of numbers using the Y1 function.
Step 1. Press [2nd] [TBLSET] to open the table setup menu. On the line "Indpnt", highlight "Ask" and press enter. On the line "Depend", highlight "Auto" and press enter.
Step 2. Now press [2nd] [TABLE] , type in a value for "X", and press [ENTER].
Step 3. Continue typing more values for X to fill up the table.

(third). How can I see more decimal places for the numbers in a table?
Answer:
Step 1. Use the arrow keys to move the highlight over the number you are interested in seeing to more decimal places.
Step 2. Read the number at the bottom of the screen. You should be able to see anywhere from 9 to 14 significant figures for your number.

(fourth). Delete the numbers in a table by:

(The following procedure will work when the table setup has been set to ask for the values of the independent variable.)
Step 1. In the table screen, check the bottom of the screen to make sure that the cursor is not blinking at the bottom of the screen. If the cursor is blinking, press the [ENTER] key to stop the cursor from blinking.
Step 2. Use the arrow keys to move the highlight to the first number in the first column of the table (the "X" column).
Step 3. Press and hold the [DEL] key to delete the numbers in the first column of the table. The entire table should become clear with this procedure.

Thanks! I wish it can help you..

Press [2nd][+] (MEM)
Select [4:ClrAllLists]
Press [ENTER]

Now you are ready to create a table from the expression of a function.

Press [Y=] to open the function editor.
On line Y1= enter the expression of the function
Press [2nd][GRAPH] (TABLE) to create your table
You will see two lists X, and Y1.

If your table is not generated from the expression of a function, but from raw experimental data, you use the [STAT][1:Edit] key sequence to open the Lists L1 to L6 and populate the two you want.

The easiest way to get you started is to reset the calculator RAM.
Press [2nd][MEM][7:Reset][1:All Ram][2:Reset] [ENTER]
If the Ram Cleared message is still displayed press the [CLEAR] button.

Open the Y= editor.
On the Y1= line, enter 2*[X,T,theta,n] +1. The [X,T,theta,n] key is just below [MODE] and to the lright of the [ALPHA] key.
Press [ENTER]
Verify that the = sign to the right of Y1 is still highlighted.
After you finish entering the function Y1, press [GRAPH].

If that Y-Column was created by a function (Y1=...) recreate the table by pressing [2nd][GRAPH] (TABLE).
If the column is a list of statistical data that you entered, there is no way to restore it. Just reenter the data anew.

Hi,
In the Y= equation editor you can enter two functions, and graph them both or calculate a table for both. However, the two functions will be evaluated at the same values of X.

Rather than trying to guess what is happening, I will show you how to get your two tables.

If you have used one the applications Inequalz or Transform it si probably still stuck in memory, and you must unload it from the RAM before recovering the usual calculator behavio(u)r

1. Press the [APPS] button, find Inequalz or Transform, point to it and click [ENTER].
2. You will be asked to Continue or Quit the application.
3. Press the number corresponding to Quit (usually 2).
4. Press [2nd][Y=] (STAT PLOT). Press [4:PlotsOff][ENTER]
   
5. Calculator replies Done.

Open the [Y=] equation editor. Type in your equations. Press [ENTER] at the end of each equation. Verify that the [=] signs after Y1, and Y2 remain highlighted when cursor is moved away from them.
Press [2nd][GRAPH] (Table) to see your 2 tables y1 and y2 calculated at the same X.

Hope it helps.
Thank you for rating the solution.

Hello,
Sorry if you already know that, but I want to make sure we understand one another.

Say you want to graph the function Y1=2X+3.
You press [MODE] to make sure that the FUNC on 4th line is highlighted permanently. If it is you press [Y=]

On the first line where it says Y1= you enter 2*[X,T,Theta,n] +3.
The X is accessed with the key to the right of the [ALPHA] key.
As you key in your function, notice that the equal sign after Y1 is highlighted and remains so. When you finish entering the function press [ENTER] so that the cursor moves to the line Y2=. Make sure that the = sign after the Y1 in previous equation remains highlighted.

You can now draw the graph by pressing [GRAPH] or generate the table Y1=f(X) by pressing [2nd][TABLE]. Under no conditions should you enter YOUR own values. If the table does not appear there may be a problem, and you will not solve it by entering values.

Now let us try to get you calculator to work as it should.

Press [2nd][STATPLOT][4:PlotsOff] , the command PlotsOff echoes on main screen. Press [ENTER] to turn statistical plots OFF. Screen displays Done.
Press [2nd][CATALOG] [ENTER]. The list of all avilable command appears. Scroll down till you reach ClrAllLists. Move arrow to the correspondig line and press [ENTER] , command echoes on main screen as ClrAllLists. Press [ENTER] to erase all old statistical lists that may be stored in the calculator memory.

Now you are ready to graph or create the table of values. Press [2nd][Table] and the table should be displayed. All you can do with the values in the table is to look at them, examine them. You cannot modifie nor erase them.

If, for reasons of your own, you think you ought to be allowed to enter YOUR values, in the table, then this is not graphing functions. The name for that is DOING STATISTICS. And the procedure is tottaly different: You enter YOUR values in lists and use the calculator to draw the data points, and to find the best fit (the curve that models the pattern of data distribution best). When you decide which fit is the best, you can use the calculator to extract the equation for the curve and, if you want it, to draw the curve on the same graph where you raw data is represented.
Hope these clarifications helps.





Before jumpin

Hello,
1.Press [MODE], scroll to set Function graphing mode.
2.Press [STAT] [5:SetUpEditor], command is pasted in home screen. Press [ENTER]. Screen displays Done. This clears old values in lists

3. Press [STAT][1:Edit] to enter data.
Press [ENTER] after each number. Cursor moves to next row. After finishing the data of Listt L1, use arrow right and UP to the head of list L2. Enter the values in list L2. Press Enter after last element.

4. Press [Y=] to display Y= editor. Clear function Y1 and all functions or remove highlight from the = in Y2, Y3, etc.
5.Press [2nd][STATPLOT]1 to select 1:Plot1


The blinking cursor on ON means graph will be drawn. Type chosen is Scatter plot. Mark chosen is a dot.

Press [ZOOM][9:ZoomStat]

If you think that the curve look like a straight line you can try to do a linear regression.
Press [STAT] Arrow right to highlight [CALC]
Select [4: LinReg(ax+b)]



LinReg(ax+b) echoes on run screen. Press [2nd] L1 Press comma, Press [2nd] L2 press comma Press [VARS] Arrow right to select [Y:VARs][1:Function] [ENTER][1:Y1]

ENTER

That is the equation for the linear regression. As you see eqaution has been saved in Y1. Press [GRAPH] to get the data and the regression curve drawn on same graph.


Hope it helps.

Hello,
Reset the memory to defaults and you will not get the error.
[2nd][MEM][7:Reset][Defaults] [2:Reset] [ENTER]. Press [CLEAR] and them [Y=] to enter the function. No need to set Zoom. Defaults work fine for y1= 4X+3.
Press [GRAPH].
Hope it helps