2 comparisons in find(...)

Hey there, here's my problem:

with

find( 3> ( 2*Sig_log(:,1) + Sig_log(:,2)  )  >1)

I try to get the idx, where the first signal is 1 and the second is 0. (bothsignals are logical)

With just one comparison it works:

find(  ( 2*Sig_log(:,1) + Sig_log(:,2)  )  >1)

this is how i get the idx where both signals are 1.

i know, if-requests i do with && or , but it doesn't work here.

any ideas?

Answer 1

[geieraffe]

it works fine with

find( (2*Sig_log(:,1)+Sig_log(:,2)>1) & (2*Sig_log(:,1)+Sig_log(:,2)<3) )

just take & instead of &&

another solution (works only if you have exact logical signals):

find( ( (2*compSig_log(:,1)+compSig_log(:,2) ) == 2) )

Answer 2

[Andrei Bobrov]

t =  Sig_log(:,1:2)*[2;1];
out = find(t > 1 & t < 3)

[geieraffe]

close!

but because of my big datasets i dont want to get another variable t.

its some thing like 7000000x1 double ... i had a solution with an extra variable too ...

... but you gave me the right idea!

[Walter Roberson]

Using the temporary variable will use *much* less memory than your proposed solution.