Introduction to MATLAB

File Types

• script m-files ( variables global).

  Create a file by the name, say, mytest.m.

  Contents of mytest.m :

  x=45*pi/180; % convert degrees to radians

  a=sin(x); % compute sine 45 degrees

  b=cos(x); % compute cosine 45 degrees

  disp('sin(45*pi/180)') % print header

  disp(a) % print result

• function m-files ( variables are local unless appear on function declaration line).

  function mean=avg(x)

  % Usage: >> mean=avg(x);

  % x - input matrix of which an average is sought

  % mean - output; the average of x (sum(x)/n)

  n = size(x); % find out the size of the matrix

  N = prod(n); % number of elements in x

  mean = sum(x)/N; % the average

• mat-file
• mex-file