Removing some rows from a matrix, Matlab

>> A = magic(4)
A =
    16     2     3    13
     5    11    10     8
     9     7     6    12
     4    14    15     1
>> b = [ 2     3];
>> A(b,:) = []
A =
    16     2     3    13
     4    14    15     1

More on manipulating 1-D array

Matlab Path

This is how I add a folder to the matlab path on command window:



if(~exist('varycolor'))
    addpath(genpath('~/MatlabAddon'));
end


The if condition checks for the existence of the function 'varycolor'. If it does not exists, it loads the folder where this file is present.

Deleting empty rows in a matrix

>> a = [1,2,3;4,5,6;0,7,8;0,0,0;0,0,0]

a =
     1     2     3
     4     5     6
     0     7     8
     0     0     0
     0     0     0

>> b = a(any(a,2),:)

b =

     1     2     3
     4     5     6
     0     7     8
>> b = a(all(a,2),:)

b =

     1     2     3
     4     5     6