See attached file.

For some reason if you have a normal value call it NV and a value in a 1x1 matrix, you recieve odd type conversion erros when you try to compare them using Min, Max, etc.... maybe though I don't understand why?

i.e Min(NM-M1x1, M1x1) = receive error

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Type conversion error - 1x1 Matrix.sm (7 KiB) downloaded 64 time(s).

I think Smath is handling this in a general style. You can't do min() on two matrices because matrices don't have a size you could compare. You can do min(det(MatrixA);det(MatrixB )) but anyway you compare scalars. In other words I am surprised that Min(2*'in,mat(8*'in,1,1)) works but not that Min(12*'in-mat(2*'in,1,1),mat(8*'in,1,1)) doesn't. I am an engineer and as such try to avoid matrices. Keep it simple where you can.

I know this issue.

There are several small drawbacks working with preprocessing and pure low-level functions; the main problem is to recognize if the argument is a number, a matrix or a system and sometimes the preprocessing/symbolic calculation doesn't output the matrix/system as outer element. This is one of the cases.

I'm trying to find an easy solution (in the end a custom preprocessing function) but there are several things to consider, and obviously requires a little bit of time.

I see, thanks for the comments. I too am an engineer and mostly only use the matrices for 'data storage' in scripts. So I tend to forget or miss-understand how Smath is treating such items.

Thanks for the comments. So I guess in general I should probably try to avoid having 1x1 matrices.

You're welcome. This is just a problem of plugins and preprocessing. If calculations are made outside the function (not in the argument placeholder) you should skip these issues.