matrix memory allocation

[acab]

Is it possible to allocate dinamically memory for a bidimensional array?

[tomstdenis]

acab wrote:

Is it possible to allocate dinamically memory for a bidimensional array?

Yes.

Homework.

Tom

[Richard Heathfield]

acab said:

Is it possible to allocate dinamically memory for a bidimensional array?

In your dutifully careful perusal of the FAQ, you unaccountably appear to
have overlooked the following:

<http://c-faq.com/aryptr/dynmuldimary.html>

--
Richard Heathfield
"Usenet is a strange place" - dmr 29/7/1999
http://www.cpax.org.uk
email: rjh at above domain (but drop the www, obviously)

[Dave Vandervies]

In article <JM********************@twister1.libero.it>,
acab <pi************@yahooDOT.com> wrote:

Is it possible to allocate dinamically memory for a bidimensional array?

Yes.
Oh, you wanted to know how?

You can either allocate a single array of m*n values and calculate
the index into that array from the row and column index, or allocate m
arrays of n values plus an array of m pointers and index using the row
and column indices separately.
(Setting things up so that you can use either of these methods is left
as a (fairly simple) exercise.)
dave

--
Dave Vandervies dj******@csclub.uwaterloo.ca

If being concerned with accuracy makes me a jerk, I plead guilty.
--Richard Heathfield in comp.lang.c

[acab]

Richard Heathfield wrote:

acab said:

Is it possible to allocate dinamically memory for a bidimensional array?

In your dutifully careful perusal of the FAQ, you unaccountably appear to
have overlooked the following:

<http://c-faq.com/aryptr/dynmuldimary.html>

I'll be careful next time,
thanks for helping!

[Ben C]

On 2006-06-12, Dave Vandervies <dj******@caffeine.csclub.uwaterloo.ca> wrote:

In article <JM********************@twister1.libero.it>,
acab <pi************@yahooDOT.com> wrote:

Is it possible to allocate dinamically memory for a bidimensional array?

Yes.
Oh, you wanted to know how?

You can either allocate a single array of m*n values and calculate
the index into that array from the row and column index, or allocate m
arrays of n values plus an array of m pointers and index using the row
and column indices separately.

You can also assign the result of a single malloc to a "pointer to
array" type and use a[i][j] syntax to access the members. This is in the
FAQ as well so I won't go into it.