Can anyone help with the use of the vector variable style? I want to define a range in a vector and access its values, but apparently I am getting the syntax wrong. Here is my example:
# Input variables.
variable e0 vector [-13.1,-6.9]
variable N equal 20
# Derived variables.
variable de equal "(v_e0[2]-v_e0[1])/v_N"
print ${de}
variable i loop $N
label cycle1
print "Step: $(v_e0[1]+v_de*(v_i-1))"
next i
jump SELF cycle1
variable 1 delete
I get the following error (21 Nov 23): ERROR: Variable e0: Invalid syntax in variable formula (../variable.cpp:2359) Last command: print ${de}
How interesting, the simplified script actually works for me as well!
The fact is, I was experimenting with a more complex script and the error appeared when this script is executed:
# Input variables.
variable count equal -1
variable i loop 20
variable fzcom equal -1
variable ten equal 10
variable e0 vector [-13.1,-6.9]
variable N equal 20
# Test variables for counting and logic operations.
print "# fzcom count exit" append /tmp/test
label cycle1
if "$(abs(v_fzcom)) > 0.1" then &
"variable count equal $(v_count+1)"
variable exit equal "abs(v_fzcom) > 0.1 && v_count > v_ten"
if "${count} > $(v_ten)" then &
"print '${fzcom} ${count} ${exit}' append /tmp/test"
print "Cycle: $i Count: ${count} Exit ${exit}"
next i
jump SELF cycle1
variable i delete
# Derived variables.
variable de equal "(v_e0[2]-v_e0[1])/v_N"
print ${de}
variable j loop $N
label cycle2
print "Exponent: $(v_e0[1]+v_de*(v_j-1))"
next j
jump SELF cycle2
variable j delete
Interestingly, the error only appears if the loop cycle1 is executed before cycle2, but not if cycle1 is deleted or cycle2 is executed first.
Update
The error boils down to the order of definition of the variables i and e0:
ERROR: Variable e0: Invalid syntax in variable formula (…/variable.cpp:2359)
variable i loop 20
variable e0 vector [-13.1,-6.9]
No error
variable e0 vector [-13.1,-6.9]
variable i loop 20
Please file this as a bug report issue on github. This needs to be looked at by @sjplimp who doesn’t hang out here but is the main architect of the variable code and specifically implemented the vector style variable support.
BTW, these delete operations are NOPs since the variables are automatically deleted when the loop values are exhausted. So you would only need to delete them (for reusing at a later part or an outside loop) if you “jump” out of the loop before the iterations are complete.
