MATLAB: How to correctly use if and elseif

iffunction elseif

Hi there! I'm a newbie on the Matlab and I just don't know how to write this function.
I have two inputs : t and toe
I have to calculate
         tk = t-toe
         if tk > 302400  tf = tk - 604800
         if tk < -302400  tf tk + 604800
I created this function :
 function [tk] = time(a)
             a=t-toe;
          if tk>302400;       tf = tk-604800;
            elseif tk<-302400;       tf = tk+604800;
          end
          end
when I run this function I get this error.
% Undefined function 'time' for input arguments of type 'double'.
what does it mean "input arguments of type double"? what is the double there?
Thank you for your help!
P.S: How can I learn more quickly this program? It seems a bit complicated for me considering I've never learnt programming before. Could I find some exercises to help me learn it?

Best Answer

create a file with below code
   function [tf] = time(t,toe)
               tk=t-toe;
            if tk>302400;       tf = tk-604800;
            elseif tk<-302400;       tf = tk+604800;
            end
  end
while saving the code you must use "time" as file name.
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