having two conditions for if statements

Question

Christiana Won 2016-2-4

编辑： Stephen23 2016-2-4

I have x= randi ([0,1],1,8, which is a 1 by 8 matrix of 0 or 1 randomly distributed and s= sum (x,2).

I wanted to write a code where

if S =1 or 2 or 3, and X(1) =0,then, Y= 100/S, elseif, S= 1 or 2 or 3, and X(1)=1, then Y=0,

But I got and error for using and/ &/ &&.

SO this is basically the code I tried using (for && on the first row, I tried 'and' and & as well).

if S == 1||2||3, && X(1) == 0,
  then Y ==100/ S;
elseif S == 1||2||3, AND X(1) ==1,
  THEN Y== 0 ;
  end

help me please!

Stephen23 2016-2-4

编辑：Stephen23 2016-2-4

@Christiana Won: You had the same problem in a comment to your last question:

You have again forgotten to take into account operator precedence, which was clearly explained to you in your last question.

MATLAB's relational operations are binary operators, so they can only handle two inputs at once. Read this to know more:

Answer 1

Roger Wohlwend 2016-2-4

if (S == 1) || (S == 2) || (S == 3)
   if (X(1) == 0)
      Y = 100 / S;
   else
      Y = 0;
   end
end