MATLAB: Removing lowest value in each line from a matrix

value

Hi everybody, Can you help remove the lowest value from each line of a matrix?

Best Answer

Here's one way. Possibly not the most compact, but easy to understand, and there's something to be said for that.

A = [0 7 7 4; -3 4 10 12; 10 12 12 4];
[rows, columns] = size(A);
B = zeros(rows, columns-1);
for row = 1 : rows
  thisRow = A(row, :); % Get this one row.
  [~, indexOfMin] = min(thisRow); % Find index of the min.
  thisRow(indexOfMin) = [];  % Delete the min element.
  B(row, :) = thisRow; % Stuff it into B
end
% B is the output.

Andrei will provide a one-liner shortly, I'm sure.

Related Solutions

MATLAB: Delete rows in Matrix ‘A’ with same values ‘c’ in column ‘b’

Here is an example:

b = 3;
c = [2 4];
A = perms(1:4);
A(ismember(A(:,b),c),:)=[]

MATLAB: Finding minimum value of certain row of matrix with condition

If I understood you correctly, try this:

clc;
workspace;
fontSize = 25;
close all;
r=[0.00   18.68  39.62  20.81   5.39  39.92
18.68    0.00  33.84  38.91  24.04  53.41
39.62   33.84   0.00  48.38  42.20  45.12
20.81   38.91  48.38   0.00  15.62  25.08
 5.39   24.04  42.20  15.62   0.00  36.40
39.92   53.41  45.12  25.08  36.40   0.00];
[rows, columns] = size(r)
thisMin = -1*ones(rows, 1);
priorRowMin = 0;
for row = 1 : rows
  % Get this row all by itself.
  thisRow = r(row, :);
  % Remove values less than or equal to the prior row's min
  % because we only want to consider values above the prior row's min.
  thisRow(thisRow <= priorRowMin) = [];
  if ~isempty(thisRow)
    % If there are any values left...
    % Find the min of what's left.
    thisMin(row) = min(thisRow);
    % Update the prior row min:
    priorRowMin = thisMin(row);
  end
end
thisMin

In the command window:

Best Answer

Related Solutions

MATLAB: Delete rows in Matrix ‘A’ with same values ‘c’ in column ‘b’

MATLAB: Finding minimum value of certain row of matrix with condition

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