Graphing Sine & Cosine
This screenshot shows the Chart & List Window being used to generate
sine and cosine function plots. An integral calculation, between the range 2 to 5, is also shown for plot A.

These plots can be generated using the input parameters below. See Graphing
a Function for more information.
Input |
Plot A: sin(x)
Plot B: cos(x) |
Range |
0; 2pi |
Angle Mode |
Radians |
No. Points |
1000 |
Notes |
Click the Calc button and then select Integral of
Plot A to perform the integral calculation. |
Square Wave with Random Noise

Input |
SIGN(sin(x)) + 0.2 * Ran - 0.1 |
Range |
0; 3 |
Angle Mode |
Cycles |
No. Points |
100 |
Notes |
The SIGN function converts sine into a square wave, while Ran
adds "noise". The noise will change each time you plot the function. |
Graphing an Asymptote

Input |
1 / x |
Range |
-10; +10 |
Angle Mode |
N/A |
Interval |
0.5 |
Notes |
Use "Interval", not "No. Points" so as to create a
discontinuity at x = 0 (i.e. 1 / 0 -> INFINITY). |
Equation of Time
The "equation of time" approximates the difference between the apparent time and mean time (i.e. between
solar noon and noon on the clock) throughout the year. The difference is due to a combination of the obliquity
of the Earth's rotation axis and the eccentricity of its orbit.

Input |
9.87 * sin (2 * 360 * (x - 81) / 364) - 7.53 * cos (360 * (x
- 81) / 364) - 1.5 * sin (360 * (x - 81) / 364) |
Range |
1; 365 |
Angle Mode |
Degrees |
No. Points |
100 |
Notes |
|
Creating a Polar Plot
Below is the Polar Rose—a famous polar plot that looks like a petalled
flower.

Input |
8 * sin(2.5t) |
Range |
1; 4pi |
Angle Mode |
Radians |
No. Points |
200 |
Notes |
Enter the above equation and select: Axes->Polar
Plot. |
Regression Analysis
Below, a scatter plot of X-Y data with a line of best fit, as determined by cubic regression analysis.

Mode |
Cubic Regression (X-Y) |
Chart |
X-Y Scatter Plot
Select: Chart->X-Y Data Charts->Show Regression Fit to show best fit. |
Notes |
Import File: sample_xy_data.txt |
Histograms
Below is a histogram generated using data in the DreamCalc SD Data
List. The second chart shows a cumulative plot of the same data. The actual data values used to generate
these plots can be found in the notes below.


Mode |
Statistical Data (SD) |
Chart |
Histogram
Select: Axes->Cumulative for the cumulative variation. |
Notes |
Import File: sample_histogram_data.txt |
Normal Q-Q Plots
Professional Edition Only. A Normal Quantile-Quantile Plot generated using data in the DreamCalc
SD Data List. The actual data values used to generate this plot can
be found in the notes below.

Mode |
Statistical Data (SD) |
Chart |
Normal Q-Q Plot (Professional Edition Only) |
Notes |
Import File: sample_qq_data.txt |
Cashflow Chart
Professional Edition Only. The chart below shows cash amounts held in the cashflow list—a separate
data list used in the financial calculations supported by the
Professional Edition of DreamCalc.

Mode |
Any - cashflow data is independent of other lists. |
Chart |
Cashflow |
Cashflow |
-2000, 3232, 7000, 9535, 13500, 21543, 12545, 18232, 11033,
7543, 5075 |
See also: Chart & List Window, and Graphing a Function
|