mean value of array after every n columns

Question

Fatma Nur Disci 2020-12-8

编辑： Fatma Nur Disci 2020-12-16

Hi,

I have 1x131072 dataPower array read from matfile. And want to average each every 128 columns. What's the problem here ?

a = matfile('x');

b=a.dataPower; %dataPower array

bround=round(b(1:131072) % array include double values like 297.3865 and just try to cast to 297 for example.

for i = 1024

k(i) = mean(bround((i-1)*128+1:i*128),2)

end

And want to get 1024 value. But error : subscript indices must either be real positive integers or logicials.

Thanks.

Answer 1

Ameer Hamza 2020-12-8

Here is a loop-free option

a = matfile('x');
b=a.dataPower; %dataPower array
bround=round(b(1:131072));
k = mean(reshape(bround, 128, []))

Fatma Nur Disci 2020-12-16

编辑：Fatma Nur Disci 2020-12-16

Hi , I thought that I was deleting this question bcs after asked it, I solved my problem, but it still appears. Thanks for your help, anyway.