Using the C Math Library

Referencing into Nested Structures

Structures can contain other structures. The image structure used in these examples contains a date structure, for example. To retrieve data from nested structures, you only need a single call to mlfIndexRef(). Simply specify the nested structure reference operation in the second argument, as shown here:

mlfAssign(&y, mlfIndexRef(images,"(?).date.year",mlfScalar(2)));

y = images(2).date.year performs the same operation in MATLAB.

You can also assign to this location by using mlfIndexAssign() instead of mlfIndexRef().

Note    You can only reference or assign to single instances of nested structures. Though you might expect this MATLAB code y = images.date.year to set y to the array of years in the date field of the images structure array, this code generates an error because the result of images.date is a structure array rather than a single structure. It is also an error in the MATLAB C Math Library.

Referencing a Single Structure in a Structure Array

Accessing the Contents of Structures Within Cells