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Re: problem with call_external() [message #5123 is a reply to message #5109]

Fri, 06 October 1995 00:00

chs11
Messages: 14
Registered: October 1995

Junior Member

In article <450kgr$2tq@hermod.uio.no>,
Stein Vidar Hagfors Haugan <steinhh@amon.uio.no> wrote:
> In article <44va4a$khr@apakabar.cc.columbia.edu>, chs11@inibara.cc.columbia.edu (Carl H Sayres) writes:
> |> I'm trying to pass a two dimensional array of floats to an ansi C function.
> |> a = (float **) argv[0]; /* this doesn't work */
>
> A two-dimensional array is still just an array -- no extra level of
> indirection is implied. You're treating a as if it was passed to your
> routine in the form of an array of pointers to each row (or column).
> This is not the case. Only one pointer is passed, and element a(i,j)
> can be found in your C program by the expression *(a + i + j*n).

I'm passing the 2-d array to another function which is expecting a
float **. Can I create a *float[], and fill in the values ?
eg. for an m by n matrix:
float ** list;
list = (float **) malloc(sizeof(float *) * m);
for(i=0;i<m;i++) list[i] = (a + i*m);

will that work?

Carl

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[Message index]

		Re: problem with call_external() By: steinhh on Mon, 09 October 1995 00:00
		Re: problem with call_external() By: chs11 on Fri, 06 October 1995 00:00
		Re: problem with call_external() By: steinhh on Thu, 05 October 1995 00:00

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