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| How do I calculate the area under a curve in Grapher? |
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The Graph | Calculate Area command computes the area under a line/scatter plot, ribbon/wall plot, or 3D XYZ line/scatter plot. When calculating area for 3D XYZ line/scatter plots, the area is calculated for the XY plane. The area is reported in the graph's XY units using zero as the base line.
To calculate area:
- Create a line/scatter, ribbon/wall, or 3D XYZ line/scatter plot.
- Select the plot.
- Choose Graph | Calculate Area.
- Enter a baseline value (Y value to calculate the area down to, default is zero) into the Area Baseline Value dialog and click the OK button.
- A report window will be displayed containing the area and information such as the data file, X column, and Y column used to create the plot. The area is reported in the graph's XY units.
Area Tip
The area is calculated by finding the area between the plot and baseline value entered in the Area Baseline Value dialog. If any part of the plot extends below the baseline value, a negative area is calculated and this value is added to the total area. The area report displays area Above Baseline Area, Below Baseline Area, and Total Area.
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