Write the function foo2 and save it in the file foo2.m.

function tf = foo2(source,target)
G = digraph(source,target);
tf = isdag(G);
end

Write the function foo1 that calls foo2. Save foo1 in the file foo1.m.

function tf = foo1(source,target)
assert(numel(source)==numel(target))
tf = foo2(source,target);
end

Analyze foo1.

coder.screener('foo1')

The Code Generation Readiness report displays a summary of the unsupported MATLAB function calls. The report Summary tab indicates that foo2.m contains one call to the digraph function and one call to the isdag function, which are not supported for code generation.

In the report, click the Code Structure tab and select the Show MATLAB functions check box.

This tab displays a pie chart showing the relative size of each file and how suitable each file is for code generation. The report displays:

The report also displays a Call Tree with Code Generation Readiness Score. The score is based on a scale of 1–5. 1 indicates that significant changes are required. 5 indicates that the code generation readiness tool does not detect issues. In this example, the report assigns foo1.m a code generation readiness score of 4 and foo2.m a score of 3.

The function foo2 calls two unsupported MATLAB functions. To generate a MEX function, modify the code to make the calls to digraph and isdag extrinsic by using the coder.extrinsic directive, and then rerun the code generation readiness tool.

function tf = foo2(source,target)
coder.extrinsic('digraph','isdag');
G = digraph(source,target);
tf = isdag(G);
end

Rerun coder.screener on the entry-point function foo1.

coder.screener('foo1')

The report no longer flags that code generation does not support the digraph and dag functions. When you generate a MEX function for foo1, the code generator dispatches these two functions to MATLAB for execution.

Write the function myfun1 that contains a MATLAB calendar duration array data type.

function out = myfun1(A)
out = calyears(A);
end

Analyze myfun1.

coder.screener('myfun1');

The code generation readiness report indicates that the calyears data type is not supported for code generation.

The report assigns myfun1 a code generation readiness score of 3. Before generating code, fix the reported issues.