what is meant by index exceed matrics dimension?

when i run this code its showing error as index exceed matrix dimension.please help me. i also tried debugging.

[Adam]

That error message is about as self-explanatory as it can be. Use the debugger and set the 'Stop on errors' option from the breakpoints menu (or type

dbstop if error

on command line first).

Then you will be taken to the line causing the error and should be able to easily see what is causing the problem. One of your indices into an array is larger than the dimension of that array in the given dimension.

[g mathi]

i also tried that, but dont know to figure out the problem. where the dimension increased? how to solve?

[Adam]

If you are new to Matlab this is exactly the kind of basic problem you need to be able to learn how to solve and using the debugger and command line is the best way to do that. You ought to understand your own code and what it is supposed to do better than anyone else.

Answer 1

[Thorsten]

If you have a 1 x 3 matrix

 A = [6 7 9]

and try to access an element that does not exist, like A(2,3) or A(1, 4), you get the error: Index exceeds matrix dimension, because in the first case your index 2 exceeds the matrix dimension 1, and in the second case, your index 4 exceeds the matrix dimension 3.

[g mathi]

i am new to matlab.say me where i need to change.help me.

[Steven Lord]

If MATLAB was a pirate ship, this behavior that causes this error would be the equivalent of trying to walk to the 4th step of a plank that is 3 steps long.

You need either to use a longer plank (increase the length of the vector into which you're indexing) or to take fewer steps (use a smaller index into the vector.)

A = [1 2 3];
A(4) % this will throw the "Index exceeds matrix dimensions" error

A2 = [1 2 3 4]; % you're using a longer plank
A2(4) % and taking the same number of steps so this will work

A3 = [1 2 3]; % the plank is the same length as the first one
A3(3) % but you're taking fewer steps so this will work

Answer 2

[Walter Roberson]

Undefined function or variable 'eNodeB'.
Error in code (line 21)
        p(time)=eNodeB(w,Rate(i_rate));

You have not provided us with what we need to test your code.

[g mathi]

i have attached full code.function declaration are made.its showing index exceeds matrix dimension error in pUE(time,ii)=UE(ii,wUE,R2). i also tried dbstop if error.but i cannot able to identify the error.how to change the code to avoid this error and take the solution. help me

[Walter Roberson]

You might have posted the full code, but the code depends upon eNodeB having been defined. We cannot test your code without some representative data for eNodeB .

[Walter Roberson]

Error using fzero (line 241)
FZERO cannot continue because user-supplied function_handle ==> @(x)utility_UE(x,ii,pp) failed with the error below.

   Undefined function 'utility_UE' for input arguments of type 'double'.
  Error in code (line 25)
              soln(i)=fzero(@(x) utility_UE(x,ii,pp),[0.001 1000]);

That is, we also need utility_UE

[Walter Roberson]

"how to solve this?"

... by posting the code for utility_UE along with any other of your routines that utility_UE calls.