You can use an anonymous function to make mertonByTimeSeries callable by splitapply. In the following example, I use an anonymous function to call a function which doesn't quite work the way splitapply expects.
First, we make a simple function to stand in place of mertonByTimeSeries which takes two vectors and a keyword argument:
function desiredFunction(multiRowDataArray, keyword, multiRowNumPeriods)
fprintf('Data Sum: %d, Keyword: %s, numPeriods Sum: %d \n', sum(multiRowDataArray), keyword, sum(multiRowNumPeriods));
end
Then we call splitapply with an anonymous function instead of a function handle to desiredFunction. The anonymous function accepts two arrays and passes these arrays along with the keyword 'numPeriods' to desiredFunction
data = [2; 2; 3];
groups = [1; 1; 2];
numPeriods = [1; 3; 7];
splitapply( ...
@(d, np) desiredFunction(d, 'numPeriods', np),...
data,...
numPeriods, ...
groups);
The output shows that the function was called correctly:
Data Sum: 4, Keyword: numPeriods, numPeriodsSum: 4
Data Sum: 3, Keyword: numPeriods, numPeriodsSum: 7
For more information about anonymous functions please refer to the following link: https://www.mathworks.com/help/matlab/matlab_prog/anonymous-functions.html
