MATLAB: Can Embedded MATLAB create C code that generates an error message

emlMATLAB

I would like to include error checking in my C code generated from Embedded MATLAB. For example, if I need to check to see if some variable "x" is zero and throw an error if it is, my Embedded MATLAB code would look like this:

if x==0,
      eml.error('Some Error Message')
end

where "eml.error" is the function I would like. It could generate C code that throws the error I specify.

Best Answer

There is no Embedded MATLAB function that auto generates C code that throws an error message.

To workaround this issue, you can use the "eml.ceval" functionality to insert your own C code in the generated code.

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MATLAB: Matlab Error Message

Your x must have strictly more or less than 100 rows. Hence the assignment fails.

Note that a much simpler way of achieving what you want is with bsxfun:

x = bsxfun(@times, Cr, x2)  %that's all that's needed. No loop.

MATLAB: How to obtain a warning message

As you found out already, lastwarn contains the last message only. You could overload the function warning to create a history of messages:

function varargout = warning(varargin)
persistent MsgList
if isa(MsgList, 'double')
  MsgList = {};
end
if nargin == 2 && isempty(varargin{1}) && isa(varargin{1}, 'double')
switch varargin{2}
  case 'GetList'
    varargout{1} = MsgList;
    return;
  case 'ResetList'
    MsgList = {};
    return;
end  % No OTHERWISE!
varargout = cell(1, nargout);
[varargout{:}] = builtin('warning', varargin{:});
MsgList{length(MsgList) + 1} = lastwarn;

This adds new messages for commands like warning('off', 'backtrace') also, so much more details are required for a smart behavior. But this demonstrates the general idea.

[EDITED] I've replaced the method to obtain and clear the list of messages. Using a magic string method in the first input is not 100% clean. Now this is used for controlling:

warning([], 'GetList')
warning([], 'ClearList')

Although it is very unlikely that somebody uses the warning message '$GetList', it might be a trap

Best Answer

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MATLAB: Matlab Error Message

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