MATLAB: Returning an Entire Row Based on the Max in a Column

MATLABmax value with corresponding row

Hi.

I'm trying to get the entire row based on the max value of a column. For example:

x = [5 6 6 9
    7 3 2 4
    3 12 8 4]

Now say I want the entire row belonging to the column 2 maximum value. I should get the row with 3 12 8 4 because 12 is the max value in column 2.

Is there a way to do this? I've tried the help and searching here and other places but cant seem to find it.

Best Answer

[~,imax]=max(x(:,2));
out = x(imax,:)

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MATLAB: Trim Matrix and find the min-max value the reshaped matrix

     a=A(:,1:2:end)
|    b=A(:,2:2:end)
    [ii1,jj1]=min(a)
    [ii2,jj2]=max(a)
    [xx1,yy1]=min(b)
    [xx2,yy2]=max(b)

MATLAB: Max

No.

You can, however, use

[distmax, idx] = max([dist1 dist2 dist3])

and then idx will indicate which index in to the [dist1 dist2 dist3] matrix was the maximum. To figure out which of the variables that came from, you would need to know the size()'s of the variables.

It would be easier if you used

[distmax, idx] = max([max(dist1(:)), max(dist2(:)), max(dist3(:))])

and then idx would indicate which variable number the max was found in; relating the variable number to the variable name is a different matter.

Plain

[distmax, idx] = max([dist1 dist2 dist3])

is the abbreviation for the above for the special case where dist1, dist2, and dist3 are all guaranteed to be scalars (something your question does not allow us to assume).

Question: what do you want to happen if the identical maximum value exists in more than one of the variables?

Best Answer

Related Solutions

MATLAB: Trim Matrix and find the min-max value the reshaped matrix

MATLAB: Max

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