Excel VBA calling sub from another sub with multiple inputs, outputs of different sizes

Question

I would like to call a sub from another sub inside in the same module. The first sub would be my main code and there I would call the second subroutine. Second subroutine receives multiple inputs as integer, double, double arrays and double matrices. The size of the arrays and matrices are known and stored in an integer variable. The sub also returns several outputs. So, I would like to do something like this.

sub Main()
    Nc As integer
    Dim kij(1 To Nc, 1 To Nc), xi(1 to Nc), a1 As Double
    'I assign values to my variables from the excelsheet e.g. Nc=Cells(1,1) etc.

    CalculateA(Nc,kij, xi, a1, a)
    Cells(5,5)=a
end sub

sub CalculateA(Nc as integer,kij as matrix double, xi as array double, a as Double)
    a=0
    For i=1 To Nc
       For j=1 To Nc
          a = a + kij(i,j)*x(i)*x(j)
       Next j
    Next i
    a = a*a1
end sub

How does it know which sub is the main sub where it starts to run. Can I put the secondary sub on top and the code somehow starts from the bottom subroutine?

Answer 1

To call a sub inside another sub you only need to do:

Call Subname()

So where you have CalculateA(Nc,kij, xi, a1, a) you need to have call CalculateA(Nc,kij, xi, a1, a)

As the which runs first problem it's for you to decide, when you want to run a sub you can go to the macro list select the one you want to run and run it, you can also give it a key shortcut, therefore you will only have to press those keys to run it. Although, on secondary subs, I usually do it as Private sub CalculateA(...) cause this way it does not appear in the macro list and it's easier to work

Hope it helps, Bruno

PS: If you have any other question just ask, but this isn't a community where you ask for code, you come here with a question or a code that isn't running and ask for help, not like you did "It would be great if you could write it in the Excel VBA format."