Hello,
What is the right way to create a 2D array to pass to a c-function
that expects **arr?
I tried:
(defun make-matrix (lisp-mat)
"Creates a two-dimensional c array, initializes with lisp matrix"
(let* ((x-dim (array-dimension lisp-mat 0))
(y-dim (array-dimension lisp-mat 1))
(c-mat (foreign-alloc :pointer :count y-dim)))
(dotimes (y y-dim)
(let ((cur (foreign-alloc :double :count x-dim)))
(setf (mem-aref c-mat :pointer y) cur)
(dotimes (x x-dim)
(setf (mem-aref cur :double y) (coerce (aref lisp-mat x y)
'double-float)))))
c-mat))
To pass the argument z to the c-function:
c_plmesh(PLFLT *x, PLFLT *y, PLFLT **z, PLINT nx, PLINT ny, PLINT opt);
(PLFLT is of type double & PLINT is of type int)
But some of the values appear to get mangled in transit.
Thanks,
-Hazen
(CFFI 0.9.0, SBCL 0.9.9, OS-X 10.4)
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