Graphing Function
The Graphing & List Window offers a convenient function graphing facility, as shown below. If the Function Grapher is not displayed, select Function Graphing from the window's Chart menu.
DreamCalc Function Graphing
Plotting a Function
To plot a function of the form y = f(x):
- Type your function into the entry box, using "x" to specify the variable. Any prefix, such as "y=", is not necessary.
- Specify the x-value range in the MIN and MAX boxes.
- Press return, or enter as plot A or B, as described below.
Example:
exp(cos(x)) - 2 * cos(4 * x) + sin(x / 12)
Rather than hitting return to enter your function, you may designate your plot as either "A" or "B" by clicking the "Enter" drop-down button. Two plots may be shown simultaneously using this method.
The input of your expression is not case sensitive. The maximum graphing numerical range is: -1E100 < x or y < 1E100. Complex numbers are not supported in graphing.
Graphing Functions
The following functions are recognized by the Function Grapher: |
- abs
- acos
- acosh
- asin
- asinh
- atan
- atanh
- cbrt
- cos
- cosh
- DLHRS
- exp
- FRCPT
- GRan#
- HEAVY
- INTPT
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- ln
- log10
- logB
- PG
- QG
- Ran#
- RG
- root
- SIGN
- sin
- sinh
- sqrt
- tan
- tanh
- zs
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- Operators: ^, +, -, *, /, %, !
- Variables: x, t
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Graphing Angle Mode
The Function Grapher has it's own angle mode, as indicated by the radio buttons in the top right of the window. This angle mode is independent of the calculator's main angle mode. It defines the operation of the trigonometric functions when the function plot is created. When changing the angle mode, you must re-enter your function by clicking Enter.
Specifying the Range
Prior to plotting your function, you should specify the desired range of x using the MIN/MAX range edit boxes. You may also use simple expressions in the range boxes, such as: "0.86 * PI".
Alternatively, you may specify the range as part of the function input string itself--using square brackets and a semi-colon " ; " as the separator.
For example:
sin(x) [0; PI/2]
DreamCalc will strip off the range values and fill out the range boxes for you when the function is entered. You must, however, specify the interval separately in the Interval or No. Points edit box (see right).
Setting No. Points or Interval
DreamCalc needs to know how many data points to generate. You can choose how to specify this using the following radio buttons:
Specify No. Points
Allows you to specify the number of points, where the corresponding interval will be calculated automatically. Generally this option is more convenient, as you do not have to re-define the interval for every function plot. However, it doesn't offer precise control of the values generated as x-inputs to your plot.
Specify Interval
Allows you to specify an interval, giving you precise control over the x values used as input to your expression. For example, if your range is [0; 10] and you specify an interval value of 1, points will be generated at integers x = 0, 1, 2, 3... up to and including 10, or eleven points in total. If your input range and interval define a number of points greater than the maximum number of permissible points, the interval will be adjusted so as to limit the number of points.
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