List Peak Values

Displays a dialog box listing minimum and maximum amplitudes and the point at which they occur, along with mean, standard deviation, and standard error for each curve.

Shortcut:

Click on the toolbar.

List Peaks within a Range

Identical to List Peak Values, but first allows you to specify a range in X or an X,Y window for 3D/4D data using the cursor. Click on the plot at one end/corner of the desired range, then drag the cursor to the other end/corner of the range and release to display the minimum and maximum amplitudes and other parameters within the selected range. For 3D and 4D surface plots this command is only available for 2D plots.

Shortcut:

Click on the toolbar.

Interpolate...

Reports an interpolated amplitude for each curve at a user-specified abscissa.

Scan X, Y

Displays data values for a single curve as you scroll through the data.

Find Baseline

Finds the average amplitude between a user-specified range of points. Useful for performing baseline shifts.

Number of Points

Reports the number of data points in each curve.

Find Intersections

Finds the intersection(s) of one curve with another curve, optionally adding data points at the intersections and labelling those points. Both curves must have monotonically increasing X values. If necessary you can use the Sort command on the Edit menu prior to Find Intersections to sort curves in increasing X order.

Related macro commands

FindIntersections

Distance from

Reports the distance and slope between two points (for XY plots, not necessarily points on a curve). You can use your mouse to click and drag from one point to another, or of course enter the coordinates in the respective text boxes. Please note: the distance reported is simply the square root of the sum of the squares of the horizontal and vertical offsets, in whatever units are used for X, Y, and Z for 3D/4D plots. The reported distance may therefore be meaningless. Exception: On XY plots and 3D plots viewed in 2D if both X and Y use either Degrees, Minutes or Degrees, Minutes, Seconds number format then DPlot assumes those values are longitudes and latitudes on the Earth, and reports the distance between points in miles, kilometers, and nautical miles.

For XY plots check "Snap cursor to nearest data point" to find the distance between two data points, rather than translated mouse position.

For 3D and 4D data, the cursor will always snap to the closest data point. In 3D views it is possible to click on a point that is hidden by the surface or by other data points in the case of a scatter plot. If this is not desirable you may need to use a bit of care when clicking.

Shortcut:

Click on the toolbar.