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Passing float was not a problem. When scalar variable passed as argument to array variable, Amibroker internally converts scalar variables to array with scalar values set to all the array elements. Setting 3rd/4th argument helped printing shapes. Thanks though.!
My Guess: Sometime setting EMPTY_VAL to default arguments is enough. Sometimes, it's required that we set some value to these arguments though they are optional arguments. I am also looking for clarity on this. Someone else here can throw some light
It's pretty obvious that you are a beginner. Get a programing book first & reading docs (if you haven't done so yet) otherwise your guesses will end up in disasters.