Re: F2CL ODEPACK problems.

Marco Antoniotti wrote:
> 
> How should I declare the CL array?
> 
> X(8, 10) ==> (make-array (* 8 10) ....)
>

Yes, that's right.  All multi-dimensional arrays are 1D arrays with the 
same number of elements.

> ?
> 
> Also, FREF seems quite strange to me.  I tried the following
> 
> (defvar arr (make-array (* 8 10) ....)) ;; filled in from 0 to 79.
> 
> (f2cl-lib:fref arr (-9 11) ((1 8) (1 10))) ==> 70
> 
> What is the meaning of this?

Macroexpand is your friend.  But basically you are trying to access 
element arr(-9, 11) which is strictly illegal since the first index is 
supposed to be 1 to 8 and the second index is 1 to 10.

(I think there's a variable you can set that will check array bounds.)

But what happens is the real index is computed as (-9 + 1) + 8*(11 - 1) 
= 70, so you got element 70 from arr.

Ray



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