two column matrix concatetate

Hi,

I want to combine two column matrix together with ‘Matrix Concatenate’. The inputs are 12x1 matrix from “Random Integer Generator” and 4x1 matrix from “Constant”: [1;2;3;4]. The “Random Integer Generator” is configured as frame based, M-ary number = 255, Initial seed = 37, Sample time = 1e-6, Sample per frame = 12.

In simulation I get such output: [137 49 17 101 168 232 138 251 143 53 248 82 1 2 3 4 137 49 17 101 168 232 138 251 143 53 248 82 1 2 3 4 …]

That is, the random matrix repeats several times which should not be. I think the reason is “Matrix Concatenate” uses old matrix between each generated frames. My question is, how to solve this problem cleverly.

Thank you very much Senmeis

[Matt Kindig]

Hi Owen,

It is a bit unclear what you are trying to do. Can you show us what your 12x1 matrix and your desired output look like?

Matt

Answer 1

[Ryan G]

I think I see the issue.

You are seeing the same random values for 12 frames. This is because you setup the 12 samples/frame. This means you defined the frame as 12*e-6 seconds and it will not update until the frame finishes.

There are 2 ways to accomplish what you want:

1. Set the sample time to 1e-6/12,or
2. Concatinate 12 blocks (not frame based) at 1e-6