Error using size and Error in cross

if isvector(a) && isvector(b)
    if (nargin == 2 && (length(a) ~= 3 || length(b) ~= 3)) || ...
       (nargin == 3 && (size(a,dim)~=3 || size(b,dim)~=3))
        error(message('MATLAB:cross:InvalidDimAorBForCrossProd'))
    end

Error using size

Dimension argument must be a positive integer scalar within indexing range.

Error in cross (line 24)

(nargin == 3 && (size(a,dim)~=3 || size(b,dim)~=3))

[madhan ravi]

Sorry Jenice , I believe you are not allowed to post the file which is copyright by Mathworks in a public forum like this.

Answer 1

[madhan ravi]

See the below links to properly use them:

https://www.mathworks.com/help/matlab/ref/cross.html

https://www.mathworks.com/help/matlab/ref/size.html

Answer 2

[Walter Roberson]

do not pass 3 or more arguments to cross unless you are deliberately telling it which dimension to process .

you were passing 4 arguments in before and that is not defined at all.

If you need to take A cross B cross C then you will need to make multiple calls to cross.