Highly nested loops

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I am creating a procedure that does calculations for a problem with a significant number of branches. I have nested for-endfor and if-endif loops to perform the calculations. Everything was working fine as I gradually increased the level of nesting until I went beyond 16 levels. Now my procedure just skips to the end without doing any of the loops or calculations. No error is reported. Is Igor limited in the extent to which loops can be nested?

tdh
I have a 30x30 array with a few valid data points in each row. I need to do a calculation on every possible path from a data point in row 1 to a point in row 2 to row 3 ... And so on. As I increased the depth of nesting it suddenly skips the entire calculation. Maybe a memory issue or maybe a limitation built into Igor to not allow more than 16 deep nested loops?

September 1, 2016 at 07:00 am - Permalink
I was asking for minimal working example.

Here for loops can be nested more than 16 levels. I'm using Igor 7.


#pragma TextEncoding = "Windows-1252"
#pragma rtGlobals=3		// Use modern global access method and strict wave access.

Function DoStuff()
	for(;;)
		for(;;)
			for(;;)
				for(;;)
					for(;;)
						for(;;)
							for(;;)
								for(;;)
									for(;;)
										for(;;)
											for(;;)
												for(;;)
													for(;;)
														for(;;)
															for(;;)
																for(;;)
																	for(;;)
																		for(;;)
																			for(;;)
																				for(;;)
																					for(;;)
																						for(;;)
																							print "123"
																						endfor
																					endfor
																				endfor
																			endfor
																		endfor
																	endfor
																endfor
															endfor
														endfor
													endfor
												endfor
											endfor
										endfor
									endfor
								endfor
							endfor
						endfor
					endfor
				endfor
			endfor
		endfor
	endfor
End

September 1, 2016 at 11:16 am - Permalink
tdhammond wrote: I have a 30x30 array with a few valid data points in each row. I need to do a calculation on every possible path from a data point in row 1 to a point in row 2 to row 3 ... And so on. As I increased the depth of nesting it suddenly skips the entire calculation. Maybe a memory issue or maybe a limitation built into Igor to not allow more than 16 deep nested loops?


It would be good to look at the code in question. Are you trying to minimize some path integral?

September 2, 2016 at 09:17 am - Permalink