Texas-instruments TI-85 Manuel d'utilisateur télécharger pdf (Page 22)

B-22 TI-85/TI-86 Graphing Calculators

TI-86 Position the cursor over the L1 at the top of

the first column.

Replace the L1 values with L1 - 1992 values by

pressing F3 (NAMES) , the menu key under L1, and

then press – 1992 ENTER .

Instead of an actual year, the input now represents

the number of years after 1992.

1.4.5 PLOTTING DATA Any functions you have in the y(x)= list will graph when you plot

data. Therefore, you should delete them or turn them off before drawing a scatter plot.

Access the y(x)= graphing list. If any entered function

is no longer needed, delete it with F4 (DELf) or clear

it with CLEAR .

If you want the function to remain but do not want it to

graph, position the cursor in that function location and

press F5 (SELCT) .

A Òturned offÓ function.

To graph data on the TI-85:

The TI-85 command Scatter L1, L2 draws a scatter plot of L1 versus L1. However, you must set

an appropriate RANGE before using this command. Program STPLT found in the TI-85/TI-86

Appendix automates this task.

Press PRGM and then press F1 (NAMES) .

Find the name STPLT (press MORE if necessary).

Press the F-key corresponding

to the location of STPLT to

run the program.

Press CLEAR to remove the menu from the bottom

of the screen for a better view.

A scatter plot is drawn of the data with the L1

data as the

input data and the L2 data as the output data.

¥ Program STPLT sets the x and y-axis tick marks to 0 so they do not interfere with your

view of the scatter plot.

¥ Because the dots the calculator uses to plot data are sometimes difficult to see when

overdrawing the model of best fit, the program places a small box around each data

point. (The boxes may appear a slightly different size with different screen settings.)

¥ Even though the TI-85 generally allows you to call lists by any names you want, you must

enter the input data in the list named

and the output data in the list named

when

using program STPLT.

¥ Lists L1 and L2 must be of the same length or an error message results.

¥ It is not possible to trace a scatter plot drawn on the TI-85.

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Texas-instruments TI-85 Manuel d'utilisateur Page 22

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