MATLAB: How to copy matrix information

for loopif statement

if i have a matrix A with dimension 800X3. i am a rookie in this so bear with me if i want to check matrix A (all colums of 3rd row A(:,3)) for value below 8 and if there is a value below 8 then create a new matrix B with all the corresponding row and colum of that value how do i do it

thank you it would be much appriciated if you could help

Best Answer

I’m not certain what you want to do.

See if this works for you:

A = randi(25, 50, 3);                   % Create Data
B = A(A(:,3)<8,:);

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MATLAB: Deleting some columns of matrix and obtain the original column index.

A = rand(100,50) ;   % some random data 
N = 20 ; 
C = zeros(N,1) ;
for i = 1:N
    [m,n] = size(A) ;
    b = rand(n,1) ;   % some random coefficients 
    [B,idx] = sort(b) ;
    % remove the column 
    A(:,idx(1)) = [] ;
    % save thew removed column 
    C(i) = idx(1) ;
end
% get the remained columns indics 
iwant = setdiff(1:size(A,2),C) ;

MATLAB: How to create a for loop to do sums of every values in the whole row

a=[1,2,3;9,8,7;4,5,6] ;
b = zeros(size(a,2),1) ;
for i = 1:size(a,2)
    b(i) = sum(a(i,:)) ;
end
b
b1 = sum(a,2)

Best Answer

Related Solutions

MATLAB: Deleting some columns of matrix and obtain the original column index.

MATLAB: How to create a for loop to do sums of every values in the whole row

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