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# st: RE: Element-by-element computation in Mata

 From "Nick Cox" To Subject st: RE: Element-by-element computation in Mata Date Mon, 10 May 2010 19:43:08 +0100

```You don't even need :* for the multiplication. Multiplication of a
scalar and a matrix is covered by common or garden multiplication *. But
the subtraction must be elementwise using :- (the elementwise
subtraction).

Nick
n.j.cox@durham.ac.uk

mjbaker@hunter.cuny.edu

I am trying to do an element-by-element computation in mata but am not
sure if it is possible. Given a matrix Z with elements z[I,j], what I
would like to do is transform the elements of Z using scalars a and b to
create a new matrix W as follows:
w[i,j]=a^2*z[i,j])-b
How might this be done using the element-by-element colon operator in
mata, if it can be done?

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```