Initializing structure arrays

Is there an effective way to allocate memory and initialize a
structure array? For example, let's say we have a 1x1000000 myArray
structure array with fields
..name
..age
where .name is a string of unknown length, but length probably not to
exceed 30, and .age is an integer, say a uint8

we have tried the technique of repmat, i.e.

myArray.name='John Chrysanthemum Doe';
myArray.age=18;

myArray=repmat(myArray,1,1000000);

however, due to matlab's delayed copy, it does not actually allocate
memory for this. I know this for a fact because I was dealing with
1 gig variables and I could repmat them with impunity.

if instead we start with
myArray(1,1000000).name='John Chrysanthemum Doe';
myArray(1,1000000).age=18;

then certainly some memory will be allocated to the other ~million
entries, but they are set to be empty matrices. is the right amount
of space (~30 characters) reserved for the .name field?

is there any other technique? commands like ones( ),
zeros( ) only take elementary classnames?

Gregory Jones
.

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