a loop creating a matrix with 2 columns

Please don't post just pictures, better to attach your worksheet.

BTW, you are not doing anything wrong, its Mathcad not passing the whole range as argument, but when a function is called with a range as argument and is not assigned a variable, an implicit loop is executed and the function is called separately for every value (similar, but not the same as vectorized function calls).

Ranges are a beasty thing and should be used just for a few couple of things. Passing a range as function argument is not one of them. You will experience also other strange effects. Just try to assign the outcome of your function to a variable 😉

You see, that way you get what you are asking for. Nevertheless I would rather create x as a vector, not a range.

Or you might consider adding additional arguments to your function - start value, second value (or step size - up to you), end value.

WE

As Werner notes, the problem is that x is a range variable, not a vector. A range variable is an iterator, so Answer(x) is called for each value of x, not once for all values of x. So it's called for x=0.25m, which yields a one row two column matrix, then it's called for x=0.3m, which yields a one row two column matrix, etc. Make x a vector and you should get the expected results.