not enough input arguments

function b = rq_fnm(X, y, p)
    [m n] = size(X);
    u = ones(m, 1);
    a = (1 - p) .* u;
    b = -lp_fnm(X', -y', X' * a, u, a)';
    
    when running this code i am getting the following error. please do help
    rq_fnm
Not enough input arguments.

Error in rq_fnm (line 2)
    [m n] = size(X);

[Shalu Mathew]

i am having an error at the second line of this code.

Answer 1

[madhan ravi]

https://www.mathworks.com/help/matlab/matlab_prog/run-functions-in-the-editor.html

[Shalu Mathew]

"Not enough input arguments." why is this error coming up?

Answer 2

[Steven Lord]

You've defined your function to accept up to three input arguments.

function b = rq_fnm(X, y, p)

On the first line of your function you use the first of those arguments, so you must pass at least the first of those input arguments into it. On the third and fourth lines you use the third and second input arguments, so you must pass those inputs into the function as well.

How did you call it? It looks like you call it something like:

b = rq_fnm

You didn't give it a value for X, so when rq_fnm tries to use X it gets confused. That's why MATLAB threw the error. It would be like someone telling you to go to the store to get three things, then not telling you what to get. You'd probably ask "So what do you want me to get?" MATLAB is a little less patient, though, so it complains "You didn't tell me what to get!" rather than asking.