Simulink signal is double when it should be logical.

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Samuel Kemp 2022-10-22

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评论： Samuel Kemp 2022-10-22

I'm using a delay block to feed a signal back into a matlab function block. The signal is a logical. It is only ever set via true or false, I never use numbers. Simulink things this is a double for some reason, and I can't even change it to a single. I've tried setting the starting value in the delay block to false or logical(0), but neither work.

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Answer 1

Paul 2022-10-22

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Hi Sam,

Set the initial condition of the Delay block (or Unit Delay block, not sure which is being used) to false or true as desired.

In the Matlab Function block editor, click on Edit Data to open the Symbols pane. Ensure the input signal to the block that is the feedback from the Delay block has the Type explcitly set to Boolean (not Inheritied). This worked for me, with a Matlab Function block code being

function y = fcn(u)
y = ~u;
end

However, I don't understand why Matlab couldn't figure it all out once the IC of the delay block was specified as a Boolean.

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Samuel Kemp 2022-10-22

Wow thank you so much! This was driving me insane, and I could not figure it out. I tried initial condition blocks and conversions, but nothing made it automatically realize it was a boolean.

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