zoom on 2d by doublicating

Zoom*2 by doublicating each piont on X & Y

Description

This will zoom the image (2D Array) by factor of 2, and this is done by doublicating each point on the X-axis, and then doublicating each point on the Y-axis.

• MATLAB release: MATLAB 7 (R14)

[Magnus Schaefer]

I can´t comment on the usefulness of this, but the code alone justifies this rating...

No preallocation, unnecessary for-loops...

The one-liner
BIG=[reshape(repmat([reshape(repmat(IM,2,1),size(IM,1),[])]',2,1),2*size(IM,2),[])]';
speeds this up by a factor of roughly 530 on my machine...

[Duane Hanselman]

The value of this submission is limited to the fact that it demonstrates how NOT to do something in MATLAB. This submission does NOT use MATLABs inherent array capabilities. Two sets of nested FOR loops are Two too many. I encourage the author to remove this file.

[Nayef Mustafa]

thanks a lot for ur comments.
about the line provided by Magnus Schaefer, the matrix was rotated by 90 degrees.
Can u provid some help about this?

thanks in advance.