Info
Questa domanda è chiusa. Riaprila per modificarla o per rispondere.
Question regarding matrix index
1 visualizzazione (ultimi 30 giorni)
Mostra commenti meno recenti
Hi,
I've a following matrix:
[1 2 3 4 5;
3 inf 5 7 inf;
5 6 7 inf inf;
2 3 4 9 1]
I wanted to find the minimum element from the last column with its row and column. So my answer to the above matrix should be 1 (as it is the minimum in column 5), row = 4, column = 5. I dont know how to code this. Please help!
0 Commenti
Risposte (3)
Sven
il 28 Mag 2014
Modificato: Sven
il 28 Mag 2014
Hi jana,
Try this:
X = [1 2 3 4 5;
3 inf 5 7 inf;
5 6 7 inf inf;
2 3 4 9 1]
[val, rowNum] = min(X,1) % Take the minimum in 1st dimension (columns)
val =
1 2 3 4 1
rowNum =
1 1 1 1 4
As you can see, the minimum value of each column is in val, and the row that it corresponds to is in the rowNum variable.
To get only the last (end) column you can use:
[val, rowNum] = min(X(:,end))
val =
1
rowNum =
4
Image Analyst
il 28 Mag 2014
Modificato: Image Analyst
il 28 Mag 2014
[minValueInLastCol, rowOfMin] = min(yourMatrix(:, end));
Or if you want the min in the last row (just for completeness in case you're interested):
[minValueInLastRow, colOfMin] = min(yourMatrix(end, :));
0 Commenti
Geoff Hayes
il 28 Mag 2014
If Z is your matrix from above, just do:
[minVal,minIdx] = min(Z(:,end));
This will return the minimum value in minVal and its index in that column in minIdx:
minVal =
1
minIdx =
4
You already know the column number (5, since last one) and the row number is simply minIdx.
0 Commenti
Questa domanda è chiusa.
Vedere anche
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!