Error at '(' in first line of code

I am getting several errors on this line of code. The first is a error at '(' between size and 1. The next is at the ')' at the end of the line. Please help me understand what I am missing The input for the moonpos function is (vector of julian days in TDT time scale; output coordinate type). There could be a problem with the input but I am not sure.

function [X,Y,Z]=moonpos(size(1);elpdt)

[Adam]

size(1)

is not valid syntax in a function definition. You should simply have variable names, not indexing into them, and 'size' certainly should not be a variable name.

I've never tried it, but I doubt ; is valid syntax in a function definition either. Arguments are separated by commas.

[dpb]

Is this really an attempt to define the function prototype here or an attempt to translate what the prototype is thought to be?

[Evan Mossel]

I tried to search through the library https://www.mathworks.com/matlabcentral/fileexchange/56041-moon-position to find when the moonpos inputs are defined. Thst was the best I could come up with. I am not sure how else to define a time vector.

[Walter Roberson]

https://www.mathworks.com/matlabcentral/fileexchange/56041-moon-position gives an example of calling moonpos()

Answer 1

[Walter Roberson]

function [X,Y,Z] = moonpos(julian_days, elpdt)

When you are declaring or calling a function, you must use comma between arguments, not semi-colon.

When you are declaring a function, the list of parameters in () must be pure variable names or the character ~ (by itself), not expressions.

In MATLAB, you do not declare the sizes of the parameters in the function declaration.