improve performance of if statment

Hello

I have bellow statement

          if ((fullPath(i-1)-1) > y)
              col1=y ;
          else 
              col1=(fullPath(i-1)-1);
          end

          if fullPath(i-1) > y
              col2=y ;
          else 
              col2=fullPath(i-1);
          end

          if (fullPath(i-1)+1) > y
              col3=y ;
          else 
              col3=(fullPath(i-1)+1) ;
          end

How can I improve performance of these "if"?

as I know in C# there is if statement like bellow

condition ? statement1:statement2 (that if condition is true statement1 is going to do and if condition is false statement2 is going to do)

is there any command like this in matlab?

Answer 1

[Guillaume]

C languages' ?: is called the ternary conditional operator. There is no such thing in matlab unfortunately.

In your case, you could replace the if ... else, by:

col1 = min(y, fullPath(i-1)-1); 
%same with col2, col3

Note: fullPath is a very odd variable name for something containing a number. I would have thought it'd be a string.

[Mark Matusevich]

Minor optimisation, do all 3 in one command:

col = min(y, fullPath(i-1) + (-1:1));

then col is a vector with elements [col1 col2 col3].