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Adams Request

I am creating script for creating request using markers of the joint

var set var = imar_roll object = (eval(stoo($f_rat_joint.i)))
var set var = jmar_roll object = (eval(stoo($f_rat_joint.j)))

var set var = str_imar str = (eval(imar_roll))
var set var = str_jmar str = (eval(jmar_roll))

output_control create request &
request_name = Vehicle_Speed &
adams_id = 1 &
component_names = "","speed_1" &
component_units = "no_units","no_units" &
component_labels = "","" &
results_name = "Speed_Data" &
f2 = "WZ((eval(str_imar)),(eval(str_jmar str)),(eval(str_jmar str)))"

I am not able to figure out error

looks like f2 = "WZ((eval(str_imar)),(eval(str_jmar str)),(eval(str_jmar str)))" is not working