expanding a variable in vector(string type)

[TheUsualAlex]

Hi, I am learning to write my own custom expression funtion.

Guess I didn't want to bother the List with such a kindergarten question.

Is there any way to expand a variable in a vector(string type)?

vector My_Function(val1, val2, val3)

{

vector Buffer = vector("[val1, 2, 3, val2, 1, val3, 7]");

return Buffer;

}

and since vector() is a string type, I couldn't assign my own number into the val*...

Oh, I am not doing this for any project actually. Just as an exercise.

Thanks.

[Mario Marengo]

It's a little strange that you'd need a 7-component vector. I know this is just

an exercise, but I don't think you'd see this very often in practice.

Unless you're building an array - but even then the *caller* must be able to use

it somehow...

Anyway; for 3- or 4- component vectors you can use the vector3() and vector4()

functions directly:

return vector3(val1, val2, 3);

return vector3(val1, val2, val3, 4);

In your case, you're returning 7 components so you need to build the string for

the generic vector() function. One way would be to use strcat(), like this:

return vector( strcat(strcat(strcat(strcat(strcat(strcat("[",val1),", 2, 3, "),val2),", 1, "),val3),", 7]") );

Ugly!

But AFAIK, the expression language doesn't have an sprintf() function yet...

-----

Mario.

[TheUsualAlex]

Whoa! I didn't know...

(I am still learning.

Thank you Mario. I will give it a try.