Thank you very much! It seems that grid (antik) is automatically loaded with gsll by quicklisp. But that doesn't seem to be the problem: both

(grid:copy-to (vector 0.0d0 1.0d0 (sqrt 2.0d0) 3.0d0))

and

(vector 0.0d0 1.0d0 (sqrt 2.0d0) 3.0d0)

seem to give the same result - which should be the endpoints and singularities for computation of a numerical integral by use of the GSL QUADPACK routine QAGP, implemented in gsll as integration-qagp. But the command

(gsll:integration-QAGp 'integration-test-f454 (grid:copy-to (vector 0.0d0 1.0d0 (sqrt 2.0d0) 3.0d0)) 0.0d0 1.0d-3 1000))

fails with a slew of errors. The debugger's first backtrace is

((:METHOD NO-APPLICABLE-METHOD (T)) #<STANDARD-GENERIC-FUNCTION GRID:FOREIGN-POINTER (1)> #(0.0 1.0 1.4142135623730951 3.0)) [fast-method]

Given that the grid command above works without any errors, I don't understand this at all. But then, as I say, I seem to have programmed in many languages over the years - with the lamentable absence of lisp. So if my questions seem trivial and naive, my apologies!

Thanks again,

Alasdair

On Mon, Nov 2, 2015 at 12:15 AM, David Catteeuw <davidcatteeuw@gmail.com> wrote:

Hi Alasdair,

I guess grid refers to Antik's grids, a data type for matrices: https://www.common-lisp.net/project/antik/

Regards,
david.

On Sunday, 1 November 2015, Alasdair McAndrew <amca01@gmail.com> wrote:
Hello,

I am using the excellent gsll package (in the first instance), to provide an interface to quadpack for the mathematics system FriCAS. I'm slowly going through calculus/numerical-integration.lisp one function at a time and writing each one into FriCAS as I go. This means writing functions in FriCAS's own language SPAD which interface with gsll.

This is made harder by me being a lisp newbie.

However, I've come to integration-QAGP, and I've tried to run the test command (having first defined the function it calls). However, all I get is errors.

I'm using SBCL in emacs-slime, and I have installed gsll with quicklisp, so that I can call an integration routine with

* (gsll:integration-qng (lambda (x) (exp (- (* x x)))) 0.0 1.0)

But the commands

* (defun integration-test-f454 (x)
(* (expt x 3) (* (log (abs (* (- (expt x 2) 1.0d0) (- (expt x 2) 2.0d0)))))))

* (gsll:integration-QAGp
'integration-test-f454
(grid:copy-to (vector 0.0d0 1.0d0 (sqrt 2.0d0) 3.0d0))
0.0d0 1.0d-3 1000)

just produces a long list of errors. Is "grid" a standard library, or does it need to be loaded first? (Told you I was a newbie...)

Thanks
Alasdair
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