Define the MATLAB function foo:

function [b,c] = foo(a)
b = svd(a,0);
c = bar(a);
end

function c = bar(a)
c = inv(a);
end

Generate a static C library for foo. Specify the input as a string scalar. Export the code generation report information to the variable info in your base MATLAB workspace.

codegen -config:lib foo -args {"A string scalar"} -reportinfo info

Code generation fails because a string scalar is not a valid input for the MATLAB functions svd and inv. The code generator creates a report information object info in the base MATLAB workspace.

The property info.Functions is a two-dimensional array. info.Functions(1) contains the description of the MATLAB function foo. info.Functions(2) contains the description of the MATLAB function bar.

To manually inspect the function bar, first display the text of the file containing bar.

info.Functions(2).File.Text

    'function [b,c] = foo(a)
     b = svd(a,0);
     c = bar(a);
     end
     
     function c = bar(a)
     c = inv(a);
     end
     '

Use getLineColumn to locate the beginning and end of the function bar in this text. The output startLoc contains the line and column indices of the first character of bar. The output endLoc contains the line and column indices of the last character of bar.

[startLoc,endLoc]=getLineColumn(info.Functions(2))

startLoc = 

  struct with fields:

      Line: 6
    Column: 1


endLoc = 

  struct with fields:

      Line: 8
    Column: 3

Define the MATLAB function foo:

function b = foo(a)
b = svd(a,0);
end

Generate a static C library for foo. Specify the input as a string scalar. Export the code generation report information to the variable info in your base MATLAB workspace.

codegen -config:lib foo -args {"A string scalar"} -reportinfo info

Code generation fails because a string scalar is not a valid input for the MATLAB function svd. The code generator creates a report information object info in the base MATLAB workspace.

The property info.Messages is a two-dimensional array containing descriptions of two code generation messages. Inspect the description of the first message.

info.Messages(1)

  Message with properties:

    Identifier: 'Coder:toolbox:unsupportedClass'
          Type: 'Error'
          Text: 'Function 'svd' is not defined for values of class 'string'.'
          File: [1×1 coder.CodeFile]
    StartIndex: 26
      EndIndex: 33

To manually inspect the segment of MATLAB code that caused this error message, first display the text of the file associated with this error message.

info.Messages(1).File.Text

'function b = foo(a)
 b = svd(a,0);
 end
 '

Use getLineColumn to locate the beginning and end of the part of the code that caused the error message. The output startLoc contains the line and column indices of the first character of the code segment. The output endLoc contains the line and column indices of the last character of the code segment.

[startLoc,endLoc] = getLineColumn(info.messages(1))

startLoc = 

  struct with fields:

      Line: 2
    Column: 5


endLoc = 

  struct with fields:

      Line: 2
    Column: 12