Dyalog Forums

If I misunderstood something please explain what you think is wrong. Thanks, Dan. There is nothing wrong. From other programming languages I know compiler options that enable shortcut evaluation of compound condition expressions connected with AND and OR, so that in a (pseudo-)statement like IF ...

I just came across a surprising piece of code that had been accepted by the interpreter. Here is a simple example. Verification of numeric data type omitted for the sake of simplicity. ∇Test a :If a<4 ⎕←'a is less than 4' :AndIf a=3 ⎕←'a equals 3' :Else ⎕←'none of the above' :EndIf ∇ Please, let's no ...

As far as I need it in my applications, it does work for derived classes. The ∆CopyFrom and ∆CopyTo properties are implemented in one central base class that I derive from. This base class also implements a MakeMeACloneOf method. The basic functionality lies in the line ∆CopyTo←SourceObject.∆CopyFr ...

Just to give an example of what works for me to clone object instances as far as I need it in my application - not claiming to deliver a solution that deserves being called general or complete. Seems to me quite close to what Paul proposed. Still there is an annoying inconsistency in use of name ...

When trying to run Dyalog 12.0 32 Bit Unicode SQAPL under 64 Bit Windows 7 using ODBC data sources, it is necessary to create data sources that are explicitly made for 32 bit access. When trying to access a DSN created by means of the Windows 7 (64-bit) standard ODBC admin console of the OS, I got ...

In a large Dyalog 12.0 ASP.NET application using APL classes and inheritance I am running into problems that might be related to the dotnet interface. I am hesitating to migrate the application to the next Dyalog version because the server hosts several applications and there is no peaceful ...

A Class is an APL object. I think that every APL object should be copied without any hierarchic dependency. Taking that sentence literally leads to a different solution: let us use ⎕CY to copy an APL "object" (according to APL old-speak). To use ⎕CY the workspace containing the original classes to b ...

To create the copy of a class in some namespace you have to fix the source of the class inside the target namespace. Here is a function that does the trick, and some little extra checking. Left argument is the name of the target namespace, right argument is the name of the class to be copied. Both ...

First, let's look at some experimental results in Dyalog 12.1: ⎕pp←17 ⎕ml←0 ⎕ct←0 ⊃10*-⍳10 0.1 ⊃10*-⍳11 0.09999999999999998 ⊃10*-⍳51 0.10000000000000006 ⊃10*-⍳1151 0.09999999999999992 If I got Goeff's post right, the interpreter should in any case first calculate the value of "10 to the power of the ...

I just repeated Phil's extension to Kai's example with Excel: 'cl' ⎕wc'Clipboard' ⍝ Copy 1 row and 3 columns into the clipboard ⍴cl.Array 1 3 ⍝ Copy 3 rows and 1 column into the clipboard ⍴cl.Array 3 Same result as with ooo. Seem like for once in my life Bill is not the one to be pestered.