variable discrete vector generation in Simulink

2012 9 11
2 个回答
3 次查看（30 天）

0 个投票

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

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Azzi Abdelmalek
Azzi Abdelmalek 2012-9-11
why, whithout matlab function? what do you want to do?
TAB
TAB 2012-9-12
Save x1=1 & x2=10 in base workspace. Take a constant block in simulink & put the value as [x1:x2]
Azzi Abdelmalek
Azzi Abdelmalek 2012-9-12
编辑：Azzi Abdelmalek 2012-9-12
at t=0; x1 and x2 are unknowns, it will not work
TAB
TAB 2012-9-12
编辑：TAB 2012-9-12
@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
Azzi Abdelmalek 2012-9-12
TAB, I have simulated your idea, and it did'nt work.
TAB
TAB 2012-9-12
Ok, from "Save x1=1 & x2=10 in base workspace", I mean save these variables manually from command window before simulation.
Azzi Abdelmalek
Azzi Abdelmalek 2012-9-12
编辑：Azzi Abdelmalek 2012-9-12
But during simulation, they can't be updated,I guess x1 and x2 are outputs of other blocks
Kaustubha Govind
Kaustubha Govind 2012-9-12
Azzi: I think TAB is saying that x1 and x2 should be parameters to the MATLAB Function block, not inputs.
Azzi Abdelmalek
Azzi Abdelmalek 2012-9-12
The question said to avoid Matlab function.
Mojtaba
Mojtaba 2012-9-12
编辑：Mojtaba 2012-9-12
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
Azzi Abdelmalek 2012-9-12
编辑：Azzi Abdelmalek 2012-9-12
Mojtaba, just one question: matlab functions make our life much easier, why want you avoid them?
Mojtaba
Mojtaba 2012-9-12
编辑：Mojtaba 2012-9-12
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
Azzi Abdelmalek 2012-9-12
Matlab function is supported by HDL coder. Depends on verision of matlab you are using
TAB
TAB 2012-9-13
Mojtaba, If you hints us about your requirement, may be anyone can suggest a better alternative solution.

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回答（2 个）

Kaustubha Govind
Kaustubha Govind 2012-9-12
编辑：Kaustubha Govind 2012-9-12

0 个投票

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].

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Mojtaba
Mojtaba 2012-9-12
yes they change during simulation.
Kaustubha Govind
Kaustubha Govind 2012-9-13
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.

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Azzi Abdelmalek
Azzi Abdelmalek 2012-9-12
编辑：Azzi Abdelmalek 2012-9-12

0 个投票

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)

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Mojtaba
Mojtaba
2012-9-11

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