Adding strings in simulink

2023 2 21
1 个回答
更新时间：2023 2 21
7 次查看（30 天）

0 个投票

I'm using a simulink matlab function for the following code:
function [e1s,e2s,crits,users] = fcn(error1,error2)
n=32;
e1 = int2bit(error1,n,true);
e1r = reshape(e1,[8,4]);
e1s = flipud(e1r');
e2 = int2bit(error2,n,true);
e2r = reshape(e2,[8,4]);
e2s = flipud(e2r');
%% error to dashboard part
crits="Critical error:";
users="User error: ";
crits =crits + " test";
I get the following two errors however:
Simulink does not have enough information to determine output sizes for this block. If you think the errors below are inaccurate, try specifying types for the block inputs and/or sizes for the block outputs.
Component:MATLAB Function | Category:Coder error
Size mismatch (size [1 x 15] ~= size [1 x 20]) in field 'Value'. Function 'MATLAB Function' (#89.286.291), line 17, column 1: "crits" Launch diagnostic report.
Component:MATLAB Function | Category:Coder error
I don't understand why the output size suddenly is a vector. Is it just that simulink doesn't like strings?

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回答（1 个）

Walter Roberson
Walter Roberson 2023-2-21

0 个投票

you are resizing the string. string literals do not appear to be dynamically sized.
Use a different variable name the first time you assign to crits such as
cbm = "Critical error: ";
crits = cbm + test;
https://www.mathworks.com/help/simulink/ug/simulink-strings.html

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Nico Verbeek
Nico Verbeek 2023-2-21
编辑：Nico Verbeek 2023-2-21
Thank you, this seems to work. The problem is that I want to add to the already existing string. This is because multiple error messages can be present at the same time. I want to then write if statements that add the different error messages to the string. Is this possible at all?
So I'll give a small snippet of my code (which is sadly just a bunch of if statements, didn't know how to do this differently) to give a better understanding of what I'm trying to do.
if e1s(3:4,:) ==1
crits=crits+" unknown critical error code";
end
if e1s(2,1:3) == 1
crits=crits+" 12v min exceeded";
end
if e1s(1,1) == 1
crits=crits+" Hardware PWM tripzone";
end

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