How to construct a customized outer function for 2 vectors?

1 visualizzazione (ultimi 30 giorni)
Hi,
I have 2 vectors, namely A (dim n) and B (dim m). I want to have some customized outer functions to give me an output of m*n matrix. For example,
A=[7,8,9];
B=[2,1,0,-1]';
C=zeros(4,3);
for i=1:4
C(i,:)=A.^B(i);
end
C
But I don't want a for-loop. Instead, I want to vectorize the calculation. Thus I tried this:-
D=exp(B*log(A))
D is better than C, since C needs a for-loop while D doesn't. But D is still not good enough, since it needs a transformation of log() and exp(). How can I get rid of the transformations, and produce the direct outer product of A.^B (or any other customized outer output f(A,B))?
Many thanks!

Risposta accettata

James Tursa
James Tursa il 10 Ago 2018
Modificato: James Tursa il 10 Ago 2018
Start with a vectorized function handle, e.g.,
f = @(x,y)x.^y
Then use bsxfun, e.g.,
result = bsxfun(f,A,B);
Note that for later versions of MATLAB, this implicit expansion capability is built-in to several MATLAB operators and bsxfun would not be needed.

Più risposte (0)

Prodotti


Release

R2016a

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by