Matlab porting to Arduino Uno issues

I have a class that makes primary use of Matlab, and we have a final project. My first problem is making an LED flash at a certain frequency, which will later be used as a means of communication with another ARD UNO board. I've tried "pause" from MATLAB, but it's not accurate enough for flashing an LED at X frequency. I've tried using "a.delay(___)", but MATLAB doesn't recognize it, even with the proper porting code. Has anyone had issues like this before? Or does anyone have code that can do this?

if exist('a','var') && isa(a,'arduino') && isvalid(a) %arduioey bits else a=arduino('COM4'); end

x = 1;

a.pinMode(8,'OUTPUT')

while x == 1

a.digitalWrite(8,1) a.delayMicroseconds(1000) %MATLAB doesn't like this part. It's happy with it's own equivalent, "pause". a.digitalWrite(8,0) a.delayMicroseconds(1000)

end

but MATLAB doesn't recognize it, even with the proper porting code.

What does "even with the proper porting code" mean?