Matlab - Access elements form each column using a vector containing the rows

Asked Feb 03 '15 at 14:25

Active Feb 03 '15 at 14:29

Viewed 28 times

y is MxN matrix with data. I need to take a specific element form each column when x (1xN vector) contains the row positions:

y(x(1),1)
y(x(2),2)
y(x(3),3)
y(x(4),4)

I search for a "Matlabic" way to do this, without a loop.

Of course y(x,:) is not the way. I thought of y(x+[0:N:N*M-1]).

Is there a more formal way?

edited Feb 03 '15 at 14:29

CSchulz

asked Feb 03 '15 at 14:25

Neuron

This is a duplicate - I'll try find the original. Try `sub2ind` – Dan Feb 03 '15 at 14:28
In case that answer isn't clear enough `y(sub2ind(size(y), (1:size(y,1))', x)` – Dan Feb 03 '15 at 14:43
That answer is pretty unclear but y(sub2ind(size(y), x, 1:size(y,2))) is what I need. Thank you. – Neuron Feb 03 '15 at 15:03
sorry there are exact duplicates, many, but I could not find them! – Dan Feb 03 '15 at 15:08
The question title was perfect though. Thanks again Dan – Neuron Feb 03 '15 at 15:09

0 Answers0