**Defining user arguments and constants is what makes Scalar unique in the panorama of available calculators. **Take a moment to familiarize yourself with this short tutorial. It is definitely a dose of very useful knowledge. Stay tuned π

## β Simple user arguments definition

**In Scalar you can simply write x = 2, y = 2 * x**, etc. Try it yourself. Pay particular attention to the fact that when defining the argument y, which depends on the argument x, the change in the value of x affects the value of y. In other words, Scalar remembers the expressions that define the arguments and uses these expressions at the time of requesting the value.

**Scalar code result:**

scalar > x = 2 scalar > x e1 = 2 scalar > 2*x + 4 e2 = 8 scalar > y = 2*x + 4 scalar > y e3 = 8 scalar > x = 3 scalar > y e4 = 10

**Scalar script:**

x = 2 x 2*x + 4 y = 2*x + 4 y x = 3 y

## β Arguments multi-dependencies

In terms of dependencies between arguments Scalar does not define any restrictions. You can create wide and deep dependency trees. This is well illustrated by the example below.

**Scalar code result:**

scalar > a = 3 scalar > b = 3*a + 2 scalar > c = a*b scalar > d = a + b + c scalar > d e1 = 47 scalar > a = 4 scalar > d e2 = 74 scalar > a = 5 scalar > d e3 = 107

**Scalar script:**

a = 3 b = 3*a + 2 c = a*b d = a + b + c d a = 4 d a = 5 d

In certain situations, it is convenient to check how user elements are defined. Use the list command to do this.

**list**

Please note that Scalar assigns the results of the calculations to the constant, while the arguments are marked separately.

**Scalar code result:**

scalar > list Type Name/Value ---- ---------- Constant: e1 = 47.0 ----- d Constant: e2 = 74.0 ----- d Constant: e3 = 107.0 ----- d Argument: a = 5.0 ----- a = 5 Argument: b = 17.0 ----- b = 3*a + 2 Argument: c = 85.0 ----- c = a*b Argument: d = 107.0 ----- d = a + b + c

**Scalar script:**

list

You can also use context help to verify the elements definition. Long click on the “example /?” button, then in the dialog select the user items.

## β User arguments vs user constants

The difference between the user constant and the user argument is fundamental. T**he constant only remembers the value, the argument remembers the expression, thanks to which the value can be calculated. **You can define your own constant by adding the const command at the beginning.

**const **def

**Scalar code result:**

scalar > x = 3 scalar > const y = x^2 scalar > y e1 = 9 scalar > x = 10 scalar > y e2 = 9 scalar > list Type Name/Value ---- ---------- Constant: y = 9.0 ----- y = x^2 Constant: e1 = 9.0 ----- y Constant: e2 = 9.0 ----- y Argument: x = 10.0 ----- x = 10

**Scalar script:**

x = 3 const y = x^2 y x = 10 y list

It’s all for today. Thank you π