HP 10413 Datasheet download pdf (Page 136)

136

This may seem to be a useless model but it can be quite useful. For

example, suppose you had collected a set of data using a data logger and a

motion detector which you suspected might represent simple harmonic

motion.

There is no trig model supplied in the list of

models built-in but some work and

experimentation may allow us to find a valid

model and test its fit.

If we change into SYMB SETUP view and

select User Defined and then change back to

SYMB view then we can insert our model as the

fit curve. How to deduce the parameters in

this model I leave to you!

As you can see in the new PLOT view, the

curve we have deduced fits the data quite well.

How well is a matter for your judgment, aided

by the RelErr variable (see page 141).

Connected data

One of the settings on the second page of the PLOT SETUP screen can be

useful for some types of data. For example, one of the common tasks in

many mathematical courses is the analysis of time series data. Unlike most

bivariate data, time series values are usually plotted as a line graph - i.e. as

connected points. This facilitated by Connect.

For example:

The sales of an ice-cream shop are shown as quarterly sales figures for the

years 1992 to 1993. Display this data on a graph.

Yr 1992 1993

Qtr 1 2 3 4 1 2 3 4

Sales 12 18 20 15 13 20 23 16

($1000)

The result (with Connect checked) is shown

right. The X values were entered as 1, 2, 3, 4,

5, 6, 7, 8 rather than 1, 2, 3, 4, 1, 2,3, 4.

1 2 ... 131 132 133 134 135 136 137 138 139 140 141 ... 330 331

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HP 10413 Datasheet Page 136