MATLAB: If and elseif statement with unexpected error that I cannot figure out

elseifif statement

I am trying to a) Create a script with if & elseif statements that will output one of three statements given three potential conditions:
1) If X & Y are < 3 but > 0: output the statement ‘X and Y are Less than 3 but greater than 0’.
2) If X and Y are less than 0: output the statement ‘X and Y are negative’
3) If X or Y are > 3: output ‘Either X or Y is greater than 3’. And lastly if none of the above conditions are met, output ‘None of the three conditions have been met’.
Where x=-0.5, y=-2
my script:
>> x=-0.5,y=-2
if x < 3 && y < 3 && x >0 && x>0
disp (‘X and Y are Less than 3 but greater than 0’)
elseif X<0 && Y<0
disp (‘X and Y are negative’)
elseif X>3 || Y>3
disp (‘Either X or Y is greater than 3’)
else
disp (‘None of the three conditions have been met’)
end
x =
     -0.5000
y =
      -2
My display is wrong:
disp (‘X and Y are Less than 3 but greater than 0’)
        |
  Here is my error:
  Error: The input character is not valid in MATLAB statements
  or expressions.

Best Answer

Look carefully at what you wrote! In the first conditional line, you check if x is greater than zero twice. In the second and third conditional line you use capital x and capital y. MATLAB is case sensitive. X is not the same as x, and Y is not the same as y.
Finally, you are to only use a single quote in MATLAB strings...
disp('A correct MATLAB string...')
Fix these things and you will be fine.
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EDIT
You are still using some strange thing instead of a single quote. Look at this one:
>> x=-0.5, y=-2
if x<3 && y<3 && x>0 && y>0
disp ('x and y are less than 3 but greater than 0')
elseif x<0 && y<0
disp ('x and y are negative')
elseif x>3 || y>3
disp ('Either x or y is greater than 3')
else
disp ('None of the three conditions have been met')
end
x =
     -0.5000
y =
      -2
x and y are negative
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