Add a grid to your graphs

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Moving the conversation to this thread from Simulate Y axis and horizontal strips - #5 by somms

I get an error that may be related to your code (or most probably to my inexperience)

When I try to add any parameter using the -a option, I always get an empty output and a “gvpr: gvpr” message:

$ dot input.dot | gvpr -a 'size=rank' -cf addGrid.gvpr
//  SIZE start: 72pt delta: 0
//  SIZE end: 72pt size: 72 delta: 0
// ARG >size=rank<
//  type: s
gvpr: gvpr

The “offending line” is

187 Val=substr(ARGV[i],Indx);

After adding some prints to debug, the problem is that Indx value is -3.