how to build a new matrix with reference to the index of another matrix ?

I have a matrix cost(i,j)= cost(3,5)=

      [  0         0   -1.5572    0.2352         0
         0   -3.2616         0         0    5.1371
   -2.8496         0         0         0         0 ]

and I want to have MM(i,j) that the same of the above, but for each non-negative value will have zero . Thus, MM should be

      [  0         0   -1.5572         0         0
         0   -3.2616         0         0         0
   -2.8496         0         0         0         0 ]

Also, I want to have a RR(i,j) matrix that has one for each negative value. Thus, RR will be

      [  0         0         1         0         0
         0         1         0         0         0
         1         0         0         0         0 ]

Thanks a lot, extreme thanks..

Answer 1

[Friedrich]

Hi,

try this

A =   [  0         0   -1.5572    0.2352         0
         0   -3.2616         0         0    5.1371
   -2.8496         0         0         0         0 ]

MM = A;
MM(A>0) = 0

RR =  MM;
RR(MM<0) = 1

Answer 2

[Jos (10584)]

MM = min(cost,0)
RR = cost<0

btw, the notation cost(i,j) means the element in the i-th row and j-th column of the array cost. I think you intend to say that cost has i rows and j columns. In that case, the following is more clear: " I have an i-by-j array cost "