'max'i'' does not work

[siddhesh-padval]

I am referring to the example given in the book.pdf (page.75) of FORM4.2:

when I run:

#define max1 "2"
#define max2 "3"
AutoDeclare Symbol x;
#do i = 1, 2
#do j = 1, 'max'i''
Local F'i''j' = x^'i''j';
#enddo
#enddo
Print;
.end

I get the following error:
test.frm Line 5 ==> Undefined preprocessor variable max

But when I change
#do j = 1, 'max'i''
to
#do j = 1, 'max{'i'}'

I do get the output as given in the manual.

I was wondering if it's an issue with my text editor or something else.

[jodavies]

Your pre-processor variable opening character should be a back-tick instead of apostrophe, like so:

#define max1 "2"
#define max2 "3"
AutoDeclare Symbol x;
#do i = 1, 2
#do j = 1, `max`i''
Local F`i'`j' = x^`i'`j';
#enddo
#enddo
Print;
.end

Then the nesting works.

[siddhesh-padval]

Thank you very much for the explanation.

I was also wondering why Tensors objects do not accept 0 index:

V v1;
T t1;
I [0];
L Vcomp = v1(0) + v1(3);
L Tcomp1 = t1(1,1) + t1(1,2);
L Tcomp2 = t1(0,1);
L Tcomp3 = t1([0],1);
P;
.end

I was expecting that the output will be:
Tcomp2 = t1(0,1);

rather than:
Tcomp2 = 0;

The index 0 works for the vector as expected.

[tueda]

Tcomp2 = 0;

This behaviour was introduced in 689b72d, though it is unclear to me whether this was intentional or not.