debugging a program

Hi all; I've written a program including two loops and I want to debug it using "keyboard " command.

 for n=1:1000
  for qq=1:100
      tsd (n,qq)= rand(1); 
      keyboard
  end
 end

I want to see the "tsd " values just in "n=10 " and "qq=50, 70; 89" . How can I do this using "keyboard" and "return" commands. I look forward to see your reply,

Answer 1

[per isakson]

Why do you want to use KEYBOARD? That's not the best way - in my opinion. Thus, I would:

1. Put the code in a function.
2. Use conditional breakpoints

However, try to replace the line "keyboard" by

    if n==10 && ( qq==50 || qq==70 || qq==89 )
      keyboard
    end

Answer 2

[per isakson]

Here are some links on debugging in Matlab

• Debugging in MATLAB
• Debugging session
• Debugging Approaches

Answer 3

[Alex]

How do i fix this?

for i = 1:x_max
    for i = 1:y_max
        if(forests(i,j) == 1) %Plot Green grass
            rectangle ('position',[i-0.5,j-0.5,MapRes,MapRez],'FaceColor',ForColor)
            hold on
        end

getting this error

if(forests(i,j) == 1) %Plot Green grass

[Alex]

sorry this is the error: Subscript indices must either be real positive integers or logicals.