transforming a 2-dim array integers to 3-dim array of logical which are true for the corresponding number - without using a loop

Hello,

I would like to take an 2-dim array like

IND=[4 3 2; 
     1 2 3];

and create a 3-dim of logicals like

GOAL(:,:,1)=[0 0 0 1;
             1 0 0 0]
GOAL(:,:,2)=[0 0 1 0;
             0 1 0 0]
GOAL(:,:,3)=[0 1 0 0;
             0 0 1 0]

So the first second dimension is newly created, it is as long as the highest number in IND and is zero(false), except for the indice, that is 1(true)

I really need it to be fast, so a for loop will not do.

Many thanks Marcus

[madhan ravi]

Give an example of your desired output

[nobody]

output = GOAL (logical 2*4*3)

input = IND (integer 2*3)

(I will then use GOAL to get specific values in another 2*4*3 matrix)

Answer 1

[Bruno Luong]

IND=[4 3 2; 
     1 2 3];
[I,~,K] = ndgrid(1:size(IND,1),1,1:size(IND,2));
J = IND;
GOAL = accumarray([I(:),J(:),K(:)],1);

[nobody]

Thanks, but I get an error

Error using horzcat
Dimensions of matrices being concatenated are not consistent.

Error in test (line 4)
GOAL = accumarray([I(:),J(:),K(:)],1);

[Bruno Luong]

Opps sorry there was a bug I fix it

[nobody]

Works great, I will try to understand what it does now :D

Thank you very much