removing zeros from a stream of data

i have figured out how to buffer randomly generated integers in to a vector with out actually making frames or using a buffer. the problem is i now have a stream of 187 zero vectors with a vector of 188 integers on the 188th instance. how do i remove the 187 zero vectors or how do i allow a MATLAB function block to with hold its output 187 times without getting the "Output argument 'y' is not assigned on some execution paths" error message?

thanks steve

Answer 1

[Image Analyst]

Hard to say without seeing your code but you can delete a variable with the clear() function. I don't know if your 188 vectors all have different names or if they are rows or columns in a 2D matrix. If they have different names:

clear('vector153');  % Delete the variable vector153.

If it's a 2D array and some columns are completely all 0's and you want to get rid of those, you can do

a = a(:,any(a));

[stephen russell]

sorry. very simple program:

• function [y,now] = vector_stack(x)
• persistent array c;
• now = 0;
• if isempty(c) % initial declaration of variables
• c = 1; % declaration of counter variable
• array = zeros(188,1); % declaration of array variable
• end;
• array(c)= x;
• if c == 188
• now = 1;
• c = 0;
• end;
• y = array;
• c = c + 1;

i have a random integer block feeding into a "MATLAB function" block. when its like this it outputs a 187 zero vectors, 1 vector of 188 integers, and repeats. i want to do away with the zeros. or if i have the program like this:

• function [y,now] = vector_stack(x)
• persistent array c;
• now = 0;
• if isempty(c) % initial declaration of variables
• c = 1; % declaration of counter variable
• array = zeros(188,1); % declaration of array variable
• end;
• array(c)= x;
• if c == 188
• now = 1;
• c = 0;
• y = array;
• end;
• c = c + 1;

i get the "Output argument 'y' is not assigned on some execution paths" error. yes i know it doesn't output 187 times thats what the error is saying. i want it to function this way. how do i get it to function this way correctly. i am trying to do what a buffer does without using a buffer.

thanks steve