How to select data outside a defined range

Hello All,

For a given data file, I'm interested to find the range of values that lie outside a range of values

Eg: For a range of values between -100 and +100, I only want the values that are greater than 20 and less than -20 (That means all the data values in between (i.e. between -20 and +20 are to be removed).

A = [-21 -15 -25 -10 0.4 10.6 17 24 44]

After condition check,

AOut = [-21 -25 24 44]

How can we carry out the same operation?

For this, I have implemented the below logic. It seems to work but I feel that it can be better optimised to be more efficient.

Cheers!

%TIn = Data file
[ii,jj] = find(~TIn);

Thr = zeros(size(TIn));

%Extract values that are below -15 and above +15
for k1=1:numel(TIn) 
    if (TIn(k1) < -15.0000)  
       Thr(k1) = TIn(k1);
    elseif (TIn(k1) > 15.0000) 
       Thr(k1) = TVOut(k1);
    end
end

%Remove zeroes
ThrO = nonzeros(Thr);

[Adam Danz]

Hint:

x(x<a & x>b)
% or
x(x<a | x>b)

[Suraj]

Hello Adam,

Thanks for the suggestion.

I tried it out now with the below logic but am still not getting the correct output.

A = [-10 -15.4 12 0 16 20];
B = zeros(size(A));
for k1=1:numel(A) 
    if A(A(k1) < -15 & A(k1) > 15) 
       B(k1) = A(k1);
    end
end

Answer 1

[Adam Danz]

You were close.

You don't need a loop and you should use OR.

A = [-10 -15.4 12 0 16 20];
B = zeros(size(A));
idx = A<-15 | A>15;
B(idx) = A(idx)

B = 1×6

0 -15.4000 0 0 16.0000 20.0000

or

B(abs(A)>15) = A(abs(A)>15)

B = 1×6

0 -15.4000 0 0 16.0000 20.0000

or

B = A .* (abs(A)>15)

B = 1×6

0 -15.4000 0 0 16.0000 20.0000

●

[Suraj]

Perfect! Thanks for your help Adam!