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This value must be a vector?

Can somebody point out where did i miss out in my program above? if I try "f" above using matrix "a", I get an error, but when I try "f1" using "b", its fine.

Can somebody point out where did i miss out in my program above? if I try "f" above using matrix "a", I get an error, but when I try "f1" using "b", its fine.
Sorry, I didn't see your post beofore I posted. Please see attached.

Mike
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