Round function with multiple inputs not working in MATLAB function block in Simulink

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Abubakar Muqaddas
评论： Paul 2020-5-2
Hi all,
I want to round a number to 3 decimal places. In MATLAB I can easily do it in this way:
>> number=25.0001;
>> round(25.0001,3)
ans =
25
If I try to do this in Simulink in a MATLAB Function block in this way:
function D_avg1 = fcn(m)
%#codegen
D_avg1 = round(m,3);
It gives error:
Error calling 'round'. This call-site passes more inputs to this function than it can accept.
Function 'BSD_System /Averaging/MATLAB Function' (#278.45.55), line 4, column 10:
"round(m,3)"
Launch diagnostic report.
Component: MATLAB Function | Category: Coder error
How to solve this?

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采纳的回答

Azzi Abdelmalek
Azzi Abdelmalek 2015-7-7
Instead of round(u,3) use
round(u*1000)/1000
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Paul
Paul 2020-5-1
Only the single argument syntax is supported:
https://www.mathworks.com/help/matlab/ref/round.html
C/C++ Code Generation
Generate C and C++ code using MATLAB® Coder™.
Usage notes and limitations:
  • Code generation supports only the syntax Y = round(X).
  • Code generation does not support char or logical data types for X.
Paul
Paul 2020-5-2
I should have mentioned that if you want the 2-argument version declaring round as an extrinsic function should work.

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