Using math.h functions in Simulink S-function builder

2 次查看（过去 30 天）
Pedro Bernardes
Pedro Bernardes 2017-2-22
编辑： Pedro Bernardes 2017-2-23
Hi,
I'm trying to create a design with some S-Functions blocks coded in C. I'm using the S-Function Builder and I trying to use some math.h functions. I included math.h in my libraries, but these functions are not referenced.
These are the errors that I got:
Writing library for code.mexw32
PATH\code_wrapper.obj .text: undefined reference to '_lroundf'
PATH\code_wrapper.obj .text: undefined reference to '_fabsf'
I would be glad if you can tell me what is the problem.
Thank you.

请先登录，再回答此问题。

回答（1 个）

Walter Roberson
Walter Roberson 2017-2-22
You have not linked against the math library. On OS-X and Linux systems, that would be by adding the option "-lm" to the mex command line (the name of the library on those systems is "m").
My reading suggests that if you were using Visual Studio that it would already have the math library built in to the standard libraries. Are you possibly using MinGW ?
  5 个评论
显示 3更早的评论
Walter Roberson
Walter Roberson 2017-2-22
Unfortunately I do not know much about lcc-32.
When I look at https://pubs.usgs.gov/sir/2008/5065/USGS_AR_LowflowGUI/LFArk1_mcr/LFArk1_BEB1E7AFA58B476C104CA972EFDF3CB1/compopts.bat which indicates it sets up for using lcc with the C math library, I do not see any explicit math library.
Pedro Bernardes
Pedro Bernardes 2017-2-23
编辑：Pedro Bernardes 2017-2-23
It usually contains every C99 libraries: http://www.cs.virginia.edu/~lcc-win32/C-Tutorial.pdf
But I don't know the reason why when I call the mex compiler it doesn't links to the library.

请先登录，再进行评论。

类别

在 Help Center 和 File Exchange 中查找有关 Block and Blockset Authoring 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by