one scalar from two vectore

I have two vectors. one speed (v1 v2 v3) and one that identifies the car on (a1 a2 a3). Only one car is running. which block I have to use to get the single speed? the bits of two cars are zero and the bits of a car is 1.

Answer 1

[dpb]

If a is a numeric array of bits,

 V=v(logical(a));

Alternatively, keep a as logical array to avoid the cast or if it must be numerical it's also

V=v(find(a));

but logical will be faster than find I'd expect.

[dpb]

I "know nuthink!" about Simulink, sorry...

Answer 2

[Emily Baldi]

thanks dpb. but I'm using simulink, not matlab. Do you know also a simulink method about mu problem?