matrix memory allocation

[acab]

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

 

[Dave Vandervies]

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

 

[tomstdenis]

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>

 

[Ben C]

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[j] syntax to access the members. This is in the
FAQ as well so I won't go into it.

 

[acab]

acab said:




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!