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It is a good idea to always make sure that the return variables willĪlways have values, and to produce meaningful error messages when This variable must be definedīefore the end of the function body in order for the function to returnįor example, here is a function that computes the average of theĪnd then called the function with a matrix instead of a vector as theĪrgument, Octave would have printed an error message like this:Įrror: `retval' undefined near line 1 column 10Įrror: evaluating index expression near line 7, column 1īecause the body of the if statement was never executed, and The symbol ret-var is the name of the variable that will hold the Here is the syntax for writing a function that In most cases, you will also want to get some information back from theįunctions you define. In the first argument to the printf statement). `Rise and shine!', followed by a newline character (the `\n'

Will cause Octave to ring your terminal's bell and print the message To print a message along with ringing the bell, you might modify theĬalling this function using a statement like this The list of arguments mayīe empty, in which case this form is equivalent to the one shown above. Hold the argument values given in the call. When the function is called, the argument names are used to Where arg-list is a comma-separated list of the function'sĪrguments. The syntax for passing parameters to a function in Octave is Normally, you will want to pass some information to the functions youĭefine. Once this function is defined, you can ask Octave to evaluate it by Stands for the alert character (ASCII 7).

The printf statement (see section Input and Output) simply tells On your terminal (assuming that it is possible to do so): Most important part of the definition, because it says what the functionįor example, here is a function that, when executed, will ring the bell The function body consists of Octave statements. Share the same pool of names as variables. Letters, digits and underscores, not starting with a digit. In its simplest form, the definition of a function named nameĪ valid function name is like a valid variable name: a sequence of