You are infinitely more expert in Ring than I am.

class predicates demo : (). clauses demo() :- % create matrix Rows = 100, Cols = 100, Matrix2D = array2M::newInitialize(Rows, Cols, 0), % insert some values Matrix2D:set(0, 0, 11), Matrix2D:set(0, 1, 22), % retrieve some values ValueA = Matrix2D:get(0, 0), ValueB = Matrix2D:get(0, 1), % how big? Si...

Hi Gal,
I don't understand what you mean by "I can not write the code."
Were you able to look at the Game of Life (GOL) code?
Do you need a very simple example of using a 2D matrix?

The "Game of Life" I posted in Visual Prolog Tips & Samples uses a 2D matrix.

http://discuss.visual-prolog.com/viewto ... 52674c8555

This problem recurred today. I closed the IDE and deleted the <project>.env file using Windows File Explorer and the problem went away.

Restarting the computer does not help.

George Conway's Game of Life for VPI 9.05 using GDI+ graphics.

You can find it here: https://github.com/hwpratt/VisualProlog ... moProjects

Download the .zip file and compile the project. No .exe or .dll files are included.

Thanks, Martin! Putting the domain declaration in the .i file works OK today , but that produced the error messages I posted above. I was testing in a minimal VIP 905 console app to sort out the same error that I was getting in another project ... very strange. Thanks again, Harrison Addendum: The p...

Is there a way to expose a user-defined domain in both the .i and .cl files of a class that doesn't require using an additional 'helper' class ( faceHelper.cl in the example below)? I get error e205 Unknown domain/interface 'expressionDOM' in pack 'main.pack' face.i if I define the domain only in th...

I have also old versions 7 and 8 installed. But that was never a problem. I always used to install new builds "on top" of the existing version that is: in the same directory. Never had troubles. Last time however I installed vip904ce.msi in another directory (can't remember why I did that). No trou...

the Editor and ChainDb were removed from VP9.

Yes, that is my understanding. I do recall that SQL databases were recommended for heavy-duty applications. You might post a separate question about that question.

The return value is the button number (1...N) you clicked. You may use it to control subsequent program flow: ButtonNumClicked = vpiCommonDialogs::messageBox("Message Title", "This is a Message", vpiDomains::mesbox_iconError, vpiDomains::mesbox_buttonsokcancel, vpiDomains::mesbox_defaultfirst, vpiDo...

clauses
onMensajesNota1(_Source, _MenuTag) :- % <== you had '.' here instead of ":-"
vpiCommonDialogs::note("Esto es un Mensaje").

Mike, You are almost there ... your VP7.4 file is ANSI encoded and VP9 needs UTF-8 . If you open the file in Notepad you will see Notepad has is a File | Save As... option. At the bottom of the Save As dialog there is an option for you to select Encoding: . Save the file as UTF-8 and it will be read...

Parentheses are your friends!
Also, if you use ";" as a substitute for "or" the IDE will politely change ";" to "or" to use the more visually obvious form!

This is a good time to download some of those classic texts you have always wanted.

https://dl.acm.org/