How can I extract the first element of a vector in simulink?

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Ziad Almalak
Ziad Almalak 2018-7-18
编辑： Michael Hodgson 2021-10-7
I have a [1500x1] vector in simulink. I wish to extract the first element from this vector. I have attempted to use a MATLAB function block to perform this task, but it yields me nothing.

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回答（1 个）

Honglei Chen
Honglei Chen 2018-7-18
编辑：Honglei Chen 2018-7-18
You should be able to use a Selector block. You can find the reference page at
https://www.mathworks.com/help/simulink/slref/selector.html
HTH
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Honglei Chen
Honglei Chen 2018-7-18
Looks like although your output is 1500x1, it is configured as a variable size signal. I would set it as
  • Number of input dimensions: 2
  • Index mode: one-based
  • 1 -> Index Option: Index vector (dialog) -> Index: 1
  • 2 -> Index Option: Index vector (dialog) -> Index: 1
HTH
Michael Hodgson
Michael Hodgson 2021-10-7
编辑：Michael Hodgson 2021-10-7
Can I use a Selector block to get the last element of an array? As in, "A[end]"?

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