Why is this if statement not working?

for i=1:10
if Li_m_full10(i,1)*10^6 ~= Ri_m_full10(i,1)*10^6
    % error 
    error_1 = sprintf( 'Difference In X Coordinate %d Between Left and Right Model Space', i );
    disp(error_1)
elseif Li_m_full10(i,3)*10^6 ~= Ri_m_full10(i,3)*10^6
    % error
    error_2 = sprintf( 'Difference In Z Coordinate %d Between Left and Right Model Space', i );
    disp(error_2)
else

end   
end

Where

Li_m_full10 = 

[15.9811212241544,  20.7151917170739,  -41.3158787392910;
-6.21811036412999,  13.5650723523276,  -40.8359583400025;
14.7702533518152,  -9.41689361653716,  -36.6475648350934;
16.7856234567904,  5.44965770745775,  -38.5652761874981;
-4.49546718159992,  -10.4977549136369,  -37.1977822200610;
-5.58443840827459,  23.1514495438229,  -42.0048342504297;
10.1458674678489,  -3.29370264049584,  -37.9925268240093;
10.8958379341580,  4.99817118096055,  -38.7136591008241;
6.96457186489267,  16.0885054037253,  -40.6268086865610;
-2.21974302416626,  10.6246429546594,  -40.3661741974887]

and

Ri_m_full10 = 

[15.9811212241544,  20.6926665759825,  -41.3158787392910;
-6.21811036412999,  13.5219038409356,  -40.8359583400025;
14.7702533518152,  -9.43334232312408,  -36.6475648350934;
16.7856234567904,  5.48342269300826,  -38.5652761874981;
-4.49546718159991,  -10.4862449523353,  -37.1977822200610;
-5.58443840827459,  23.1872988430950,  -42.0048342504298;
10.1458674678489,  -3.27066013992277,  -37.9925268240093;
10.8958379341580,  5.01851352020439,  -38.7136591008241;
6.96457186489267,  16.0681334029748,  -40.6268086865610;
-2.21974302416626,  10.5691345641832  -40.3661741974887]

Errors are printed for all values.

The '~=' in the code doesn't seem to be working for each element i.

[KSSV]

You may consider difference of the columns you want to find whether the numbers are different or not.

d1 = Li_m_full10(:,1)-Ri_m_full10(:,1) ;
d2 = Li_m_full10(:,3)-Ri_m_full10(:,3) ;

In the above id d1 or d2 has zeros, then the numbers are equal, if not they are different.

Answer 1

[Walter Roberson]

http://matlab.wikia.com/wiki/FAQ#Why_is_0.3_-_0.2_-_0.1_.28or_similar.29_not_equal_to_zero.3F

[Jay]

Thanks again Walter.