How to handle matrix resizing?

Hi,

In my program, I define a matrix A. Then I store some data in A.
Since input data is generated by another program and the dimension is
unknown, normally I define A as large as possible, say
A(10000,10000), to accomodate them. Occsionally the dimension of the
data exceeds 10000. Although Matlab can extend the dimension of A
automatically to accomodate the data, it is very very slow. But if A
is defined as very large martix from scratch, the program will take
much more time to finish. Any one can advise me how to solve the
problem?

Jerry
.

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