How to solve it?
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Don't know your purpose but it seems you created beta function twice, with same name.
And they should be differ according to your variable units.
Is solution below a possible candidate?

Regards

Why this works when the line operator is removed as shown ?



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Why this works when the line operator is removed as shown ?...

Hi Amarasekera. Although β.H2 has a numerical result, changing the value of h also changes the value of β.H2, which doesn't happen with β.H. This is because line causes β.H2 to be evaluated each time it is used, while the value in β.H remains constant and fixed.



In this way, vectorize is evaluated with the Min function for β.H2, and vectorize generally does not work well with matrix functions.

A version of β.H without matrix functions, with cases, for example, shouldn't have this problem. However, the correct approach is that if β.H is going to hold a constant value, there's no need for it to be evaluated every time it's used.

Best regards.
Alvaro.

Thank you Alvaro for your useful comments.
As you suggested, the cases function does not create any issues.