topic Re: for loop stopping in Discussions

for loop stopping

johnm — Fri, 09 Jun 2023 17:08:26 GMT

I'm stumped at the moment on an issue with a FOR loop. (using JMP16)

// open a window
mywindow = New Window(" xyz ", .....etc.);

// create journal
myjrn = mywindow << journal window; 

For( i = 1, i <= 100, i++,  

// do a lot of lines of lines requiring about 5' run time.
	// periodically journal objects.

	Close All( data tables, no save )
);  // end to for loop

// SAVE the journal:
myjrn << save journal( "my.jrn" );

The loop stops after an iteration.

(I can restart the loop after the for (i=1, i<=100, i++, stops and doesn't proceed to i=2.

for (i=2,i<=100, i++, stops and doesn't proceed to i=3.

for (i=3,i<=100, i++, stops and doesn't process to i=4.

Welcoming thoughts on what is causing this? resolution?

Thanks,

John

Re: for loop stopping

Mark_Bailey — Thu, 25 Aug 2022 15:21:25 GMT

Does each code in each iteration depend on the data tables that you are closing within the For() function?

Re: for loop stopping

Jeff_Perkinson — Thu, 25 Aug 2022 15:45:17 GMT

Without seeing all the code it's difficult to diagnose.

First check the log window for any errors.

If there are none, then I'd start with looking at the value of i after the For() loop. I suspect you'll find it's greater than 100. Then you need to see where it is getting changed inadvertently. This can occasionally happen with name collisions with columns in a data table. If you just can't figure out where that could be happening, try changing the i to something else and see if it starts working. That will confirm the name collision.

Re: for loop stopping

txnelson — Thu, 25 Aug 2022 15:26:13 GMT

Is it possible that somewhere in your Fro() loop, that you are setting the variable "i" to a large value?

Re: for loop stopping

David_Burnham — Thu, 25 Aug 2022 15:45:32 GMT

Do you have other parts of code using "i" as a variable? Could the variable be getting reassigned (e.g. if you are using user-defined functions)?