Heterogenous Contacts in UDEC

UDEC
1

Hello all,
I want to create a heterogenous contact heterogenous grain model in UDEC. I defined block grain groups and also defined contact groups after which this is the FISH code I wrote:
fish define contact_group
ic = block.contact.head
loop while ic # 0
ind_b1 = block.contact.block1(ic)
ind_b2 = block.contact.block1(ic)

if block.group(ind_b1) = 'Dolomite'
    if block.group(ind_b2) = 'Dolomite'
        command
        block contact group 'Homogenous_Dolomite' range contact ic
        endcommand
    endif
    if block.group(ind_b2) = 'Periclase'
        command
        block contact group 'Heterogenous_Dolomite_Periclase' range contact ic
        endcommand
    endif
endif

if block.group(ind_b1) = 'Periclase'
    if block.group(ind_b2) = 'Periclase'
        command
        block contact group 'Homogenous_Periclase' range contact ic
        endcommand
    endif
    if block.group(ind_b2) = 'Dolomite'
        command
        block contact group 'Heterogenous_Dolomite_Periclase' range contact ic
        endcommand
    endif
endif

ic = block.contact.next(ic)
endloop
end

When I run this, I get this error:
imaget

What I think is ic is a local variable working inside FISH code only and command option works outside FISH(I may be wrong in this). How to rectify this problem?

Thanking You

2

The index for the range command should be found using. block.contact.id(ic)

3

If you are using command-end_command, you need to tell the command that ic is a FISH variable.
Use:
block contact group “name” range contact @ic
or:
block contact group “name” range contact [ic]