MATLAB Programming Fundamentals - MathWorks

fieldName = input('Select data (height or weight): ','s');

dataToUse = myData.(fieldName);

If you enter weight at the input prompt, then you can find the minimum weight value

with the following command.

min(dataToUse)

ans =

90

For an additional example, see “Generate Field Names from Variables” on page 11-13.

Error Handling

The preferred method for error handling in MATLAB is to use a try, catch statement.

For example:

try

B = A;

catch exception

disp('A is undefined')

end

If your workspace does not contain variable A, then this code returns:

A is undefined

Previous versions of the documentation for the eval function include the syntax

eval(expression,catch_expr). If evaluating the expression input returns an error,

then eval evaluates catch_expr. However, an explicit try/catch is significantly

clearer than an implicit catch in an eval statement. Using the implicit catch is not

recommended.

2 Program Components