[Quick Question]Multiplications of all elements

Hi guys,

I have a matrix A = [ 1;9;1;4;4;6]

Is there any efficient way other than writing a loop that reach the result,

B = 1*9*1*4*4*6 = 864

Thanks a lot

==== Problem solved. Those comments are really useful!

Answer 1

[per isakson]

Yes. Try

    B = prod( A )
    B =
       864

[Jan]

You can find such solutions using the documentation, e.g. type lookfor product in the command line. Even asking Google for "Matlab multiply all elements" let you find a bunch of related links, which suggest to use PROD().

[per isakson]

Or you can ask at Answer ;-)

[Xiao Tang]

Thanks, it's more than an answer!

However, I realized that what I really want is B(1) = A(1)=1, B(2) =A(1)*A(2)=9,B(3) = A(1)*A(2)*A(3)=9,B(4)= A(1)*A(2)*A(3)*A(4) = 36,etc. Any idea other than a loop like

for i =1:n; B(i) = prod(A(i)); end

[Matt Fig]

CUMPROD

[Oleg Komarov]

@Xiao: the documentation of prod() references cumprod(). You better give a try to the documentation, since it will definitely save you time.

[Xiao Tang]

I see. Thanks a lot guys!