Coder: Exclude/ignore code sections?
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I'm using coder to generate C source code. Of course many matlab functions are not available for coder. But I still want to use these functions when running the code in matlab.
Currently I have to comment out all these sections that are not coder-friendly when doing C source code generation. Is there something I can wrap them in to make the coder ignore them?
1 个评论
Sean de Wolski
2013-11-4
Alex, please contact technical support and let them know what functions you would like code generation support for.
采纳的回答
Mike Hosea
2013-10-28
You can wrap them with
if coder.target('MATLAB')
...
end
Or if that gives an error,
if isempty(coder.target)
...
end
You can also declare unsupported functions as "extrinsic" and use them in generated mex files. This practice has some pitfalls, and where unsupported data structures are involved, it can rather involved and advanced. However, in the simpler cases it is very simple. If foobar() is MATLAB function that you are passing, say, an m-by-n matrix to, and foobar returns, say, a 1-by-n vector (for example, this is what SUM would do with an m-by-n matrix where neither m nor n is 1), you would write:
coder.extrinsic('foobar');
y = zeros(1,size(x,2));
y = foobar(x);
Or, if you don't want to mess with coder.extrinsic:
y = zeros(1,size(x,2));
y = feval('foobar',x);
The y = zeros(...) line looks like wasted effort, but what it really does is tell the compiler what to expect by the next line, so it can copy the data from the MATLAB return into local storage. Basically, if you know what a function will return given the type of the input, then you just initialize the output variable to the appropriate type and then call the function.
7 个评论
Alex
2013-11-4
Jan Siegmund
2020-3-6
This is a great feature but somehow it does not work.
I am using the HDL Coder and escape an Inputparser with
if coder.target('MATLAB')
p = inputParser;
%...Inputparser Stuff
addOptional(p, 'variable', 'default', @(x)ischar(x));
%...Inputparser Stuff
else
%if nargin = ...
end
However the coder still complains about the anonymus function ischar() in that input parser section.
'@(x)ischar(x)' is an anonymous function. Anonymous functions are not supported for fixed-point conversion.
It seems, that the coder gets through the first stages fine, but complains later on. I want the coder to ignore
all of the code in coder.target('MATLAB').
Jan Siegmund
2020-3-10
编辑：Jan Siegmund
2020-3-10
Steven Lord
2020-3-10
You don't need an anonymous function to do this:
@(x)ischar(x)
Just specify a regular old function handle to the ischar function.
@ischar
Jan Siegmund
2020-3-10
Thanks @Steven,
I also had the fixed-point designer struggle with a "load(...)" function which was clearly escaped by "coder.target('MATLAB')". Using "coder.load(...)" will help here I guess?
Jan Siegmund
2020-3-16
Converting to a function handle is possible, but how about combined logic, like
@(x) ~isempty(x) && ~isvector(x)
?
Jan Siegmund
2020-3-18
Update: and even function handles are not supported:
'@ischar' function handles are not supported for fixed-point conversion.
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