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## Re: [Axiom-mail] Coersion error

 From: Tim Daly Subject: Re: [Axiom-mail] Coersion error Date: Tue, 16 Jun 2009 06:19:33 -0400 User-agent: Thunderbird 2.0.0.21 (Windows/20090302)

```Arnold Doray wrote:
```
```I'm trying to create a set of orthogonal polynomials using the
Gram-Schmidt process, but I hit a problem:

dot(f,g) == integrate(f*g*x^2,x=-1..1)
proj(f,g) == dot(f,g)*f/dot(f,f)

p0 := 1
p1 := x - proj(p0,x)
p2 := x^2 - proj(p0,x^2) - proj(p1,x^2)

p0 and p1 evaluate correctly, but p2 hits this error:

; (DEFUN |*2;dot;5;frame1394| ...) is being compiled.
;; The variable |*2;dot;5;frame1394;MV| is undefined.
;; The compiler will assume this variable is a global.
Internal Error
The function coerce with signature OrderedCompletion Integer ->
Expression OrderedCompletion Integer is missing from domain
Expression(OrderedCompletion (Integer))

I've also tried to define p(n) as a recursive function like so:

p(0) == 1
p(n | n > 0) == x^n - sum(proj(p(k),x^n),k=0..n-1)

But get a stack overflow: (eg, evaluating p(1))

OpenAxiom will attempt to step through and interpret the code.
Cannot compile map: proj
We will attempt to interpret the code.
Cannot compile map: p
We will attempt to interpret the code.

>> System error:
Bind stack overflow.

I would appreciate any pointers where I am going wrong. I'm an Axiom
newbie. These calculations were done using open-axiom 1.2.1

Thanks
Arnold

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```
You are not doing anything wrong. The error message says that there is a missing function (coerce) from one domain to another. I will look at the problem and get
```back to you.

Tim

```

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