How to pix the syntax error?

Hi,

I have proplem with syntax:

function [TDOA, FDOA] = CAF(S1, S2;1500;1e6; 10e-4);

The error is:

• Invalid syntax at ';' . possibly ,a ')' is missing
• Parse error at ')': usage might be Invalid MATLAB syntax

How to pix them, thank you so much

Answer 1

[Walter Roberson]

function definition statements must start with the word function (case sensitive so Function is not permitted )

After function there is an optional list of output variables .

A list of output variables can be a single variable name or it can be [ followed by a comma separated list of variable names followed by ] . If there was any output variable then after the single variable or list of variables there must be a = (equals sign)

Only pure variables names can be used for output variables , with no indexing of any kind. No () or {} or dot indexing .

~ is not permitted as an output variable name in a function definition .

After that is the function name which is mandatory . Only pure variable names are permitted as function names.

After the function name there is optional list of input variables . This is a ( followed by a comma separated list of input variables followed by a )

Input variable names must be either ~ or else a pure variable name. No indexing of any kind is permitted .

Your code attempts to use semicolon between input variable names and also attempts to use numbers in place of input variable names .

There is no way in MATLAB to specify default values for variables in a function definition .

The list of input variables can end with the special name varargin . This special name captures all remaining input arguments into a cell array that can be accessed with regular cell notation . This permits an indefinite number of arguments to a function .

Answer 2

[madhan ravi]

Read more about functions()

 
function [TDOA, FDOA] = CAF(S1, S2,1500,1e6, 10e-4);   
                            %  ^---^----^---^-------- commas not semicolon

[krishna sudeep]

Can you provide source code for this?

[Walter Roberson]

 function [TD0A, FD0A] = CAF(S1, S2, S3, S4, S5)
   if ~exist('S3', 'var'); S3 = 1500; end
   if ~exist('S4', 'var'); S4 = 1e6; end
   if ~exist('S5', 'var'); S5 = 10E-4; end

Answer 3

[Steven Lord]

It looks like you're confusing defining a function with calling a function.

The input arguments you specify in a function definition must be valid variable names or varargin separated by commas. S1 and S2 are valid varaible names separated by commas while 1500 is not a valid variable name.

When you call the function you can specify values for the function and those values can be variables, literal numbers, or expressions.

As a simple example, the definition of the why function states that its input argument will be stored in a variable named n inside the workspace of the why function.

>> dbtype 1 why.m

1     function why(n)

When you call why you can specify a number in that call.

>> why(42)
To satisfy the tall and good not excessively terrified mathematician.

You can specify a variable.

>> x = 99;
>> why(x)
Don't ask!

You can specify an expression.

>> why(ceil(exp(4)))
They knew it was a good idea.