Series Properties Dialog

DM2003 has powerful graphic engine that can display not only "raw" numeric data, but also arbitrary functions on the given data calculated dynamically without actual data changes. Series may be in either data or functional mode. Data series must be associated with worksheet and display numbers from worksheet (possibly transformed by expressions). Functional (or parameterized) series don't use numeric data; instead, point coordinates are defined as a result of evaluation of X and Y expressions, both depend on cx parameter whose values belong linear grid ranged from cxmin to cxmax and divided into given number of equal intervals. See expression syntax for more details about available functions and operators. Notice that it is possible to enable a cache associated with every series so that point coordinate calculations will not affect plotting performance.

Why use expressions?

Example: in many cases the electrical conductivity of semiconductors obeys so-called "activation law": R~exp(Ea/kT). You can easily linearize R(T) dependence and determine activation energy Ea if you plot ln(R) vs. 1/T: set Y expression to "ln(cy)" (or just select logarithmic Y axis tick layout) and X expression to "1/cx", then use Ruler tool to determine curve slope. In many cases such "on-fly" plot transformations is much more convenient than direct data recalculation, and allows you easily make experiments with your data. Manual Fitter tool available in the Fitting menu also can help you to find parameterized expressions.

Series Properties dialog box should be used to change various parameters of the selected series, grouped on two tabs - Data and View:

Data Tab:

View Tab: