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Matlab Subscripted Assignment Between Dissimilar Structures Inc

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A structure is a data type which contains several values, possibly of different types, referenced by name. The simplest way to create a structure is by simple assignment. For example, consider the function

The following m-file computes the value, gradient, and Hessian of f at a point x, and returns them in a structure:

function fx = f(x) fx.Value = (x(1)-1)^2+x(1)*x(2); fx.Gradient = [2*(x(1)-1)+x(2);x(1)]; fx.Hessian = [2 1;1 0]; We can now use the function as follows: >> x = [2;1] x = 2 1 >> fx = f(x) fx = Value: 3 Gradient: [2x1 double] Hessian: [2x2 double] >> whos Name Size Bytes Class fx 1x1 428 struct array x 2x1 16 double array Grand total is 12 elements using 444 bytes The potential of structures for organizing information in a program should be obvious.

Note that, in the previous example, Matlab reports as being a ``struct array''. We can have multi-dimensional arrays of structs, but in this case, each struct must have the same field names:

>> gx.Value = 12; >> gx.Gradient = [2;1]; >> A(1,1) = fx; >> A(2,1) = gx; ??? Subscripted assignment between dissimilar structures. >> fieldnames(fx) ans = 'Value' 'Gradient' 'Hessian' >> fieldnames(gx) ans = 'Value' 'Gradient' (Note the use of the command , which lists the field names of a structure.)

Beyond simple assignment, there is a command for creating structures. For information on this and other commands for manipulating structures, see .

Mark S. Gockenbach
Wed Sep 8 10:44:13 EDT 1999

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