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Questions and Answers

Data Table I/O

  • How do I import data from external files?
  • How do I paste in the data table from the clipboard?
  • How do I append data to the existing data table?
  • What is the best way to manage replicates?
  • How do I import data from fixed length data block binary files?
  • How do I implement an averaging digital filter upon import?
  • How do I drag and drop files into TableCurve 2D for import?
  • How do I save the data table to a spreadsheet format?
  • How do I copy the data table to the clipboard?

Data Input

  • How do I input data while simultaneously graphing it?
  • How do I reverse the X and Y values?
  • Although TableCurve 2D sorts the data by ascending X, is there a way to save the data unsorted or in some other sort order?
  • My X values are equally spaced. Do I need to enter each of these?
  • Can I have a transformation applied after entering X or Y values?
  • Can I enter or edit the data table using a simple ASCII editor?
  • What is the best way to assign weights to data?
  • How do I generate data?

Viewing Data

  • How do I view a graph of the current data table?
  • Can I view arbitrary functions of X?
  • How do I compare different data sets?
  • Can I get a printout of the basic data table statistics?

Data Preparation

  • How do I disable points so that they are excluded from the fitting?
  • How do I transform one or more of the data columns?
  • How do I clear the current data table?
  • Can I discard inactive points?
  • How do I change the basic data table titles?
  • How do I difference the data, create cumulatives, or otherwise normalize the data?
  • Can I subtract a baseline?

Filtering Data

  • What is the easiest way to smooth or denoise my data?
  • Why are there other procedures for smoothing and denoising?
  • How do I isolate data components in the frequency domain?
  • Apart from parametric fitting and Fourier filtering, can data components be isolated in any other way?

Estimation and Prediction

  • When should I use non-parametric estimation?
  • Why are there five different five non-parametric estimation options?
  • How do I predict or forecast data?
  • Can I forecast in both directions?
  • How do I optimizing the AR Fit?
  • Can I apply the AR Filter to other data sets?

Curve-Fitting

  • How can I viewing the built-in equations?
  • How do I decide which equations to fit?
  • Could you furnish an overview of the built-in fitting options?
  • What is a ‘high-precision’ polynomial or rational equation?
  • What is a ‘Chebyshev converted’ polynomial or rational equation?
  • How do I set the curve-fitting preferences?
  • Why are there different matrix methods for linear fitting?
  • When should I use robust fitting?
  • How do I create a custom equation set?
  • As soon as I load a data set, some kind of fitting seems to be taking place. What is going on?
  • Is this the same thing as the ‘Fit in Background’ option that appears in the curve-fit progress dialog?

User Defined Equations

  • How do I add my own equations to TableCurve 2D?
  • If I want to create a User-Defined Function, where do I start?
  • In the UDF Adjust procedure, what do I do when the UDF curve is not visible?
  • Can I have multiple collections of UDFs?
  • Can I express the minimum and maximum limits for parameters with formulas rather than values?
  • Is there any advantage to using the built-in non-linear functions within UDFs?
  • How do I fit only the UDFs?

Review and Equation Selection

  • What is the Graph Start and List Start all about?
  • How does one effectively inspect equations?
  • I see three tenth order polynomials in the equation list, all with the same goodness of fit. Which one should I use?
  • Why is the format for the Lotus 123 export different from that if the Excel export?
  • Why is the formula for certain equations missing from Excel and Lotus export?
  • How do I display the Curve-Fit and Residuals in the same graph?
  • What is an SNP plot anyway?
  • Can I set up a reference from a separate fit defining a standard, and have this plotted for all future fits?
  • I know which TableCurve 2D equation number I want. How do I find it in the equation list?
  • How do I limit equations to only those which are continuously increasing or continuously decreasing?
  • Why do some of the equation list options appear in both the List menu in the Curve-Fit graph and in the menu of the Equation List window?
  • In the code generation option, is the function code itself portable to different compilers?
  • How do I change the numeric precision used in graph titles and labels?
  • How do I control which of the titles are displayed in Review graphs?
  • Can I copy the curve-fit graph to the clipboard not as an image but as the raw numeric data which comprises the graph?
  • On certain fits the first equation does not appear in the list upon entering the Review. What happened to it?
  • Can a Singularity Constrained Non-Linear SVD Rational equation (Eqns 7901-7939) have a pole in the middle of the data range? Also, for equations with no poles in the data range, shouldn’t these equations produce the same fit as the linear form?
  • If I see points during the Review that I wish to have excluded from a refit, how do I proceed?