julia lang - Updating vector to avoid excess memory use -

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i have function returns vector. since call function many times, want update vector provide rather create new vector. avoid use of memory , increase speed.

the original code looks like:

function!(prob1,pi,prob0) prob1=pi'*prob0 return prob1 end

of course creates new prob1 vector each time. i've attempted amend in 2 different ways:

    function!(prob1,pi,prob0)     in 1:length(prob1)         prob1[i]=pi[:,i]'*prob0     end     return prob1     end  #or      function!(prob1,pi,prob0)     in 1:length(prob1)         prob1[i]=dot(pi[:,i],prob0)     end     return prob1     end

however, both run slower original code although use less memory. suggestions improving performance time great.

you don't need define function, there 1 (albeit undocumented): at_mul_b!(prob1,pi,prob0) should give want.


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