JRTalk extension for Serf and XL-Plot

and math library.

download JRTalk.pdf.

The Dynamic Link Library, JRTalk.dll, regulates the communication between Serf or XL-Plot and a program that you may have created in Visual Basic, Media Cybernetics IP+ script or in C. It also gives access to a part of the Serf/XL-Plot math library. When calling one of its functions, the dll launches Serf or XL-Plot if (and only if) this is required and then executes the function, which may be the creation of columns of data in a spreadsheet or a graph on a drawing sheet.

With the extension, the Basic or C programmer can simulate the selection of menu items in Serf or XL-Plot, create new spreadsheets and drawing sheets and select ranges of spreadsheet cells to manipulate their contents. For example, he could prepare two arrays of floating point numbers in a Visual Basic program and then call the S_XYPlot() function to create a new plot:

Declare Function S_XYPlot Lib "JRTalk" Alias "@S_XYPlot$qqspft1spct4" (x As Single, y As Single, ByVal ilen As Integer, ByVal xs As String, ByVal ys As String) As Long
Dim x(100) As Single, y(100) As Single

ilen = 100
For i = 0 To ilen - 1
x(i) = i
y(i) = i * i
Next i
ret = S_XYPlot(x(0), y(0), ilen, "s", "nM")
PostError (ret)

Sub PostError(error As Long)
    If (error >= 0) Then
        Exit Sub
    ElseIf (error > -100) Then
        S_Error (error)
    Else: MsgBox "DDL error"
    End If
End Sub

The math library contains a number of statistical tables and functions, floating point routines such as matrix inversion, LU-decomposition, QR-decomposition, Eigen-decomposition,Fourier transformation, polynomial regression and many functions to manipulate arrays of integer or floating point numbers.