# Question:VectorCalculus:-PositionVector: Component vs. coordinate (Help File)

## Question:VectorCalculus:-PositionVector: Component vs. coordinate (Help File)

Maple

Hello,

I am little confused about the help file regarding the VectorCalculus:-PositionVector function.

In the help file the first argument "comps" is defined as
"list(algebraic); specify the components of the position Vector"

In spherical coordinates, the position vector is

`r e_r`

So, if the position vector to be entered is given in terms of the components (in spherical coordinates), the VectorCalculus:-PositionVector function should be called as

`VectorCalculus:-PositionVector([r,0,0],spherical)`

But this returns

`[0,0,r]`

(in the cartesian frame). This would make sense if r coordinates is r, theta coordinate is 0 and phi coordinate is 0.

However, if I call it as

```VectorCalculus:-PositionVector([a,b,c],spherical)
```

Then I end up with

`[a*sin(b)*cos(c),a*sin(b)*sin(c),a*cos(b)]`

Thus, the "components" given in PositionVector are not the components but the coordinates r=a, theta=b, and phi=c.

Am I missing something here or the help file is misleading?