Need help with matlab

Its not working for some reason. Can any one help.

A= [21  22  21  26  31  35  59  89  45  35  20  13
  21  22  18  24  32  36  58  88  46  34  21  23
  15  14  17  28  33  37  57  87  47  33  22  43
  17  15  24  21  34  38  56  86  48  32  23  3
  19  18  19  23  35  39  55  85  49  31  21  9
  14  14  21  29  36  30  54  84  50  30  24  8
  22  21  14  21  37  31  53  83  51  31  25  7
  21  18  16  25  38  32  52  82  52  32  19  6
  23  15  17  24  39  33  51  81  53  33  78  5
  21  19  15  27  38  34  51  80  54  34  17  4
  20  14  18  20  37  35  50  79  55  35  16  13
  ];

GRAPH = A(1:11,1:12);
if GRAPH < 15
  bar(GRAPH,'b')
  hold on
else if  GRAPH >= 16 & GRAPH <= 31
    bar(b,'g')
  else if  GRAPH >= 32 & GRAPH <= 49
      bar(c,'y')
    else if GRAPH >=50 & GRAPH<=99
        bar( GRAPH,'k')
      else if GRAPH >=100
          bar( GRAPH,'r')
        end
      end
    end
  end
end
hold off

[Stephen23]

"Its not working" does not tell us what this code should do... and we cannot read your mind. What output do you expect to get?

Answer 1

[Guillaume]

It's not working is not very helpful. We can't read your mind and know what it should be doing.

With that proviso, I suspect that your problem is with your if statements,

if matrix < scalar

is equivalent to

if all(matrix(:) < scalar)

That is all the elements of matrix must be smaller than scalar.

As I've no idea what you're trying to do with the comparisons, I can't tell you how to fix it.

-----

Side note:

if ...
   else if ...
      else if ...
      end
   end
end

is better written as:

   if ...
   elseif ...   %note it's one word
   elseif ...
   end          %only one end

Answer 2

[Star Strider]

I’m guessing here as to what you want to do. See if this is it:

GRAPH = A;
bar(GRAPH(GRAPH<15),'b')
hold on
bar(GRAPH(GRAPH >= 16 & GRAPH <= 31),'g')
bar(GRAPH(GRAPH >= 32 & GRAPH <= 49),'y')
bar(GRAPH(GRAPH >=50 & GRAPH<=99),'k')
bar(GRAPH(GRAPH >=100),'r')
hold off