# Logical indexing with matrix

2 vues (au cours des 30 derniers jours)
Betina Isbak le 18 Juin 2013
I have a matrix which is 197*14. The 1. column is datenum of dates, the 2. column is day, the 3. is month, the 4. is year and the rest of the matrix is data. I want to calculate the mean per month of the data. So far I have used logical indexing to find the different months and then used the given index to calculate the mean. However, it only calculates the mean of the first column and not all of the matrix. Here is what I have done for one month:
Price=GaspriceFM(:,5:end); % To get only the data
[JulyIDX,~,~] = find(GaspriceFM(:,3) == 7); % Find data from July
July=mean(Price(JulyIDX));
How do I get it to calculate the mean per column of the entire matrix? Thank you very much in advance!
##### 0 commentairesAfficher -2 commentaires plus anciensMasquer -2 commentaires plus anciens

Connectez-vous pour commenter.

### Réponse acceptée

Iain le 18 Juin 2013
Try:
July=mean(Price(JulyIDX,:));
##### 1 commentaireAfficher -1 commentaires plus anciensMasquer -1 commentaires plus anciens
Betina Isbak le 18 Juin 2013
It works!! Thanks a lot..

Connectez-vous pour commenter.

### Catégories

En savoir plus sur Dates and Time dans Help Center et File Exchange

### Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by