Iterator Giving Wrong Value

Jaz

Hi,

I am new to JSL and was trying to get the following piece of code to work:

 

dx = Open("Manually Logged Data.jmp");
Current Data Table (dx);
numberOfRowsManually = nrows(dx);
Column("End");
colManually = Column(4);
For (i = 1, i <= numberOfRowsManually, i++, print(colManually[i]));
print (i);

 

The "End" column has 14 rows and I'm trying to iterate the variable i between 1 and 14 but when I print the value of i to check it the number 15 is returned in the log. Shouldn't it return 14 because there are only 14 rows in my data table?

Any help would be appreciated.

ih

To terminate the loop, JMP increases the iterator by 1 and then checks if it meets the condition you set to stay inside the loop.  In this case, you are printing the value of the iterator after it exited the loop, therefore you see the first value that did not cause the loop to execute again.  In this example, notice how 2 is the last value inside the loop, but 3 is printed as in your example:

 

Names default to here( 1 );

For( i=1, i <= 2, i++,
	print( "Inside loop: " || char( i ) );
);
print( "Outside loop: " || char( i ) );