HP 39gs_40gs_Mastering The Graphing Calculator_English_E_F2224-90010

The NUM SETUP view offers more useful features. Change to that view

now and change the

NumStep value to 10. If you then swap back to

the

NUM view you will see (as right) that the sequence jumps in steps of

10. In case you don’t realize…

2.1475E9 is ‘computer speak’ for

2 1475 10

.⋅ ×

Now go back to the

NUM SETUP view and change the Automatic

setting to Build Your Own by moving the highlight to it and pressing the

+ key or by using

. Switch back to the NUM view and enter the

values

1, 10, 50 and 100 into the N column.

You will find that the values for those terms of each sequence will appear

in the

U1 and U2 columns almost immediately. In case you didn’t realize,

the reason for the larger text is that the

button has been pressed.

Due to the type of problems one is usually trying to solve with sequences,

the

NUM view rather than the PLOT view is often more useful in this

aplet, but let's have a look at the

PLOT view anyway. Two types of

plots are available, the default being Stairstep.

Change to the

PLOT SETUP view and ensure that the setup view is the

same as that shown in the two screens above right. Then change to the

PLOT view and you should see a graph similar to the one shown below

right. The second type of graph is the Cobweb.

101