DreamCalc Graphing Examples
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.
Sine & Cosine Functions
These plots can be generated using the input parameters below. See Graphing a Function for more information.
InputPlot A: sin(x)
Plot B: cos(x)Range0; 2piAngle ModeRadiansNo. Points1000NotesClick the Calc button and then select Integral of Plot A to perform the integral calculation.
Square Wave with Random Noise
InputSIGN(sin(x)) + 0.2 * Ran – 0.1Range0; 3Angle ModeCyclesNo. Points100NotesThe 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
Input1 / xRange-10; +10Angle ModeN/AInterval0.5NotesUse “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.
Equation of Time
Input9.87 * sin (2 * 360 * (x – 81) / 364) – 7.53 * cos (360 * (x – 81) / 364) – 1.5 * sin (360 * (x – 81) / 364)Range1; 365Angle ModeDegreesNo. Points100Notes
Creating a Polar Plot
Below is the Polar Rose—a famous polar plot that looks like a petalled flower.
Polar Rose
Input8 * sin(2.5t)Range1; 4piAngle ModeRadiansNo. Points200NotesEnter 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.
X-Y Plot with Cubic Regression
ModeCubic Regression (X-Y)ChartX-Y Scatter Plot
Select: Chart->X-Y Data Charts->Show Regression Fit to show best fit.NotesImport 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.
ModeStandard Deviation (SD)ChartHistogram
Select: Axes->Cumulative for the cumulative variation.NotesImport 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.
ModeStandard Deviation (SD)ChartNormal Q-Q Plot (Professional Edition Only)NotesImport 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.
Cashflow Chart (Professional Edition Only)
ModeAny – cashflow data is independent of other lists.ChartCashflowCashflow-2000, 3232, 7000, 9535, 13500, 21543, 12545, 18232, 11033, 7543, 5075
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