variable discrete vector generation in Simulink

I need to make sequence (1D vector) from 2 constants in Simulink.

e.g.: x1=1 and x2=10 as input constant

Desired vector: X=[1 2 3 4 5 6 7 8 9 10]

I know It is very easy to generate such vector in matlab, but I really want to do it in terms of blocks and not even Embedded Matlab Function Block.

Thanks in Advance

[Azzi Abdelmalek]

why, whithout matlab function? what do you want to do?

[TAB]

Save x1=1 & x2=10 in base workspace. Take a constant block in simulink & put the value as [x1:x2]

[Azzi Abdelmalek]

at t=0; x1 and x2 are unknowns, it will not work

[TAB]

@Azzi Abdelmalek: x1 and x2 are in base workspace, so they will be evaluated during model update. So at t=0, values will be available in constant block.

Can you let me know how you have tried this ?

[Azzi Abdelmalek]

TAB, I have simulated your idea, and it did'nt work.

[TAB]

Ok, from "Save x1=1 & x2=10 in base workspace", I mean save these variables manually from command window before simulation.

[Azzi Abdelmalek]

But during simulation, they can't be updated,I guess x1 and x2 are outputs of other blocks

[Kaustubha Govind]

Azzi: I think TAB is saying that x1 and x2 should be parameters to the MATLAB Function block, not inputs.

[Azzi Abdelmalek]

The question said to avoid Matlab function.

[Mojtaba]

Making x1 and x2 as variable and the using a constant block [x1:x2]works but the problem is that x1 and x2 change during the simulation.

[Azzi Abdelmalek]

Mojtaba, just one question: matlab functions make our life much easier, why want you avoid them?

[Mojtaba]

my advisor told me that do not use them because after completing the simulation model we are going to make the code out of it(maybe HDL/PLC code) that if we use embedded matlab block it is not possible to do it. Have you ever heard of it?

[Azzi Abdelmalek]

Matlab function is supported by HDL coder. Depends on verision of matlab you are using

[TAB]

Mojtaba, If you hints us about your requirement, may be anyone can suggest a better alternative solution.

Answer 1

[Kaustubha Govind]

Mojtaba: Do x1 and x2 change during simulation? If not, try defining them as workspace variables.

• Constant block: Enter [x1:x2] as Value.
• MATLAB Function block: Make them non-tunable parameters on the block's Ports and Data Manager and compute output using [x1:x2].

[Mojtaba]

yes they change during simulation.

[Kaustubha Govind]

I think this is a lot harder to do. You will need to understand Variable-Size Signals because if x1 and x2 change during simulation, the size of the signal also changes. I don't see any easy way to do this without the MATLAB Function block, but even with that block, I think this will be tricky.

Answer 2

[Azzi Abdelmalek]

check the blocks supported by HDL coder at http://www.mathworks.com/help/hdlcoder/ug/summary-of-block-implementations.html at the end of the page(simulink/User-Defined Functions/MATLAB Function)

MATLAB Function (was Embedded function for previous versions)